Saturday, 20 February 2010

A magnificent view of the Space Shuttle Endeavour STS-130 and the ISS in tandem!



click image to enlarge

The weather predictions for this morning suggested a possibility of clear sky - and hence a possibility to see a morning twilight pass of the duo Space Shuttle Endeavour STS-130 and the International Space Station, which decoupled a few hours earlier.

I observed from the appartment of my girlfriend this time, who lives at the 2nd floor of the same building as me. This allowed a wide vista over the rooftops towards the west and southwest. The pass happened around 6:49 am local time (5:49 UTC on the 20th), the sun was at an altitude of -10 degrees, and hence twilight coloured the sky already. I could see Saturn, Spica and a couple of other stars, low in the southwest. The pass would reach a maximum altitude of 20 degrees.

The pair was easy to see as they majestically sailed over the rooftops in the twilight sky, rising over the rooftops below Saturn and then passing Spica. They were very close, 1.7 degrees apart around 5:49:30 UTC (measured from the photograph above), passing the same point about 3.7 seconds apart. The Shuttle, at around magnitude 0 to +1 the fainter of the two, was slightly ahead of, and a tiny bit lower in declination than, the ISS, which attained about magnitude -1 to -2. A magnificent view!

Above is one of three pictures I took. They suffered a bit from vibrations, as I had only limited space to put up the tripod in the window-sill of my GF's bedroom, and the window-sill apparently did transfer some vibrations to the tripod & camera. The picture shown above shows the duo close to Spica (alpha Virgo) and is the image with the least "wobbly" trails. Movement of both objects is from right to left in the picture.

Friday, 19 February 2010

Slowly uncovering more clues in the Misty-2/USA144 patch

I have written before about the launch patch of the enigmatic USA 144 launch from Vandenberg on 1999 May 22. This was possibly the Misty-2 stealth satellite (99-028A; while a piece of debris or intentional decoy from the same launch frequently observed by me and other trackers is 99-028C, the "USA 144 Decoy"):


In my earlier post, I wrote that the meaning of the tiger symbol remained a mystery. In this I based myself on noted patch intelligence sleuth Dwayne Day in his discussion of this patch in an overview article in The Space Review, who considered that the tiger was unexplained, although one option was that perhaps it might have "a hidden symbolic meaning for the program (like the dragons)". (the latter comment about dragons points to the use of winged dragon symbolism in launch and mission patches for SIGINT satellites).

I think I now might have come somewhat closer to interpreting the tiger on the patch. I think that, like the half illuminated earth globe with satellite, it designates a unit involved in the launch and mission.

Let me first recapitulate what I wrote earlier here. The black and white gridded globe with revolving satellite clutched in the tiger's claws, appears to be a reference to the 4th Space Launch Squadron (4th SLS), whose patch emblem was this one below:



The 4th SLS had almost exactly a year before the launch fused into the 2nd SLS, which itself is mentioned in the rim text of the USA 144 patch.

Note that the four yellow stars also feature in the 4th SLS patch. The 2nd SLS has only three stars in its emblem, which might explain the difference noted by Dwayne Day: "Another mystery is why the patch contains four stars, whereas the tee-shirt logo contains only three".
(alternatively, and maybe simultaniously, it could refer the 614th Space Operations Flight - see below - which had 3 gold stars in its emblem)


The tiger

But now: the tiger. I found the same symbolism of a tiger with an earth globe between its paws in this patch, which is a patch of the 614th Space Intelligence Squadron.


This unit post-dates the USA 144 launch, as the unit was activated in 2003 (the launch was in 1999). It is however a spawn of the 614th Space Operations Squadron, which was activated (as the 614th Space Operations Flight) in 1996, before the Misty-2 launch. The 614th Space Operations Squadron also featured the tiger symbology, in the form of two tiger eyes in the emblem patch:


The mission of the 614th SOPS was to "provide the component commander for Air Force space forces, COMSPACEAF, the expertise to command and control Aerospace forces in continuous support of global and theater operations".

Both the (related) units had headquarters based at Vandenberg. They have since all gone up in the 614th Air and Space Operations Center, which again has a tiger in its emblem.

Given the connection of this lineage of units to Vandenberg launches and tiger symbolism, I feel the tiger on the USA 144 patch could well represent the 614th Space Operations Squadron or a sibling unit.

In view of the establishment of the 614th SOPS/SOPF relatively shortly before the launch, maybe the text "The Cat's Out of the Bag!" could refer to USA 144 being perhaps the first mission initiated since it's formation. (from what I have found so far, it is not clear when the 614th SOPF became the 614th SOPS, but the transformation seems to have been completed by mid-1999). It is a nice double reference to the tiger of the 614th SOPS and the common meaning of the phrase "to let the cat out of the bag" (disclosing a secret, which basically is what a launch does: you let the thing that remained hidden so far fly out in the open).

Monday, 15 February 2010

Again USA 200, and another Proton Breeze-M tank

A somewhat belated report on the 11th. It was very clear on the night of 11-12 Feb. As I had dinner guests, I couldn't take advantage of it during the LEO window, but I did target a suitable HEO object later that night when my guests were gone: USA 200 (08-010A).

Like two nights earlier, the images with USA 200 contain a Russian Proton Breeze-M tank as a stray. It is another one than that of Feb 9th however: this time it was 06-056B, the Breeze-M tank of the MEASAT 3 launch.

Below images (both with the EF 100/2.5 Macro USM) show the short fat trail of USA 200, and the longer trail of the Breeze-M tank.

click images to enlarge


Friday, 12 February 2010

Mexican "impact" / fireball event is NOT due to Kosmos 2421 debris

News is doing the rounds of a spectacular fireball/sonic boom near Mexico city on 10 Feb, 18:30 local time (= 11 Feb, 00:30 UTC).

Initial reports talked about an actual impact with a 30 meter wide crater and damage to a bridge and road. That seems not to be the case.

Subsequent news releases suggested that it was a piece of Komsos 2421 debris impacting (06-026 HK, #33006).

For a summary, see Phil Plait's Bad Astronomy blog post here.

However, this event was certainly NOT due to the mentioned piece of space debris. The object in question was, contrary to apparent statements by a spokesman of the Mexican Space Agency (?), no way near passing over Mexico in a window of several hours around the reported time:

click image to enlarge



In addition, there are elements available with an epoch 0.75 days after the event, suggesting it indeed was still in orbit after that time. I used Alan Pickup's fine SatEvo software with the current F10.7 solar flux parameter (94) to predict a decay near 12 Feb 9h UTC, 1.25 days after the Mexican event.

Wednesday, 10 February 2010

USA 200 and a Proton Breeze-M tank - UPDATED

The last 3 weeks have been clouded and saw no opportunity to observe. Yesterday around midnight, I however noted it had cleared. It was a short duration clearing only before clouds bringing snow came in again, but the sky quality was quite good.

I tried to target the HEO USA 200 (08-010A) with the EF 2.5/100 Macro while it was passing through Auriga, but had bad luck: it didn't show up on the pictures, presumably being a bit too faint this time. Checking the images more carefully a few hours later, I discovered it some 0.35 degree off from the predicted position, being almost half a minute late.

The same picture series captured a stray unclassified object: a Russian Proton upper stage Breeze-M tank, 08-057B, from the 5 Nov 2008 launch of the Astra 1M satellite. Below is an animated GIF showing the trail (which was close to the image edge), and a picture of it's orbit. The animated GIF is constructed of 5 10-second exposure images taken at 20 second intervals.

Photobucket

click image to enlarge

Thursday, 14 January 2010

The weather at SatTrackCam Leiden

Weather conditions obviously have a major impact on the activities at SatTrackCam Leiden. Last two weeks for example have seen a lot of snow, and consequently clouded skies.

I have had an outdoor thermometer for some time, but manually logging a strict temperature record proved too cumbersome to uphold. However, as of this week I have a fully computerized weather station here at SatTrackCam Leiden which logs information on temperature, air pressure, wind, air moisture and rainfall on a 15-minute basis. The station sends the data wireless to a receiver in my home, where it is logged in the receiver memory. The receiver can be attached to the pc by USB.

Hence, I now have the opportunity to record basic weather data in detail for my location.

Below pictures show the basic outdoor rig, and a picture of SatTrackCam Leiden in the snow on january 10th.

click image to enlarge


Saturday, 9 January 2010

GOCE keeps flaring

Yesterday evening (Jan 8) started clear. I captured GOCE (09-013A) flaring again, and then observed Lacrosse 3 (97-064A). I also tried the HEO objects USA 179 and 198 but due to a mistake in software parameters I keyed in, I photographed the wrong sky locations...

Next the sky got clouded again, the forerunners of snow.

The GOCE flare behaviour is by now getting familiar (if still in aspects unexplained: see the previous post). This time, the flare occurred at 17:02:55.1 UTC (Jan 8). This corresponds to an angle of 93.4 degrees and a tilt of 25.8 degrees.

Below is the picture and the resulting brightness diagram.

click images to enlarge







I also photographed a GOCE flare on 5 January, under appaling sky conditions. Start and end of the trail were not visible (hence, I cannot produce a brightnes sprofile for that flare) and in fact the flare even shos up only marginally (see image below). By measuring the brightest point of the flare and comparing to the GOCE orbit, it resulted in a flare time though: 17:15:48.1 UTC (Jan 5). This corresponds to an angle of 93.2 degrees and a tilt of 37.8 degrees.

click image to enlarge


Monday, 4 January 2010

GOCE flares compared (second UPDATE)

With four timed brightness profiles now available for GOCE flares, I created a comparison chart.

In this diagram, each profile has been shifted in Y value to keep them clearly separated. The delta values refer to the offset of the observed flare path tilt and the theoretical panel tilt (either 67.5 or 22.5 degree, depending on which panel caused the flare). This is a measure of distance to the theoretical central flare path.

As can be seen, there appears to be no clear correlation between delta/distance and the quality of the flare peak.

The profile for November 26th 2009 is less reliable as it suffered from thin cloud interference.

click diagram to enlarge



The flares are (perhaps - see below) caused by the solar-panel covered sun-facing side of the space probe:




With regard to the identification of the panels: below is a schematic cross-section of the GOCE probe. Two solar panels on the solar-facing side of the eight-plane shaped probe are responsible for the flares: one inclined at 22.5 degree and one at 67.5 degree.

click image to enlarge



This creates the geometric situation below (with the green trails being the theoretical central flare paths for the two panels indicated):

click image to enlarge


There is a baffling aspect to these flares and this model though. Flares from flat panels should be highly specular ("narrow") in both directions: angle and tilt. In essence: with regard to the probe's major axis (angle) and minor axis (tilt).

But they are not!

They are highly specular in angle ( = with regard to the probe's long axis) as evidenced by the short duration of the flares (FWHM ~0.5s). But not in tilt.

This is not what you expect from a satellite with an angular surface such as GOCE: it is what you expect from a tubular object (which GOCE isn't). This is a bit baffling. It could mean it aren't actually the solar panels which are causing the flaring behaviour, but some other part of the GOCE body. Problem is, there is no clear candidate for it...

Another GOCE flare

Yesterday evening started very clear, but ended cloudy. Nevertheless I was able to bag several objects: the Lacrosses 2 & 3, the NOSS 3-4 Centaur rocket, GOCE flaring, and the HEO objects USA 179 and USA 184.

GOCE (the European Gravity field and steady state Ocean Circulation Explorer) made a zenith pass, zipping close to M31 at mag. +4 to +5 and then flaring briefly to mag. +2 at 17:24:23.15 UTC. It was nice to watch. GOCE is in a very low orbit and moves very fast: the flare almost looks like a meteor to the eye.

The flare was caused by the 67.5 degree panel and the time yields a flare angle of 93.6 degree and tilt of 51.9 degree. The 93 degree angle is consistent for all GOCE flares I so far observed (theoretically, that angle should be 90 degrees, i.e. at the moment of culmination when the sun-observer-satellite flight direction makes a square angle). The miss distance to the theoretical central flare path (quite large in this instance: some 175 km!) doesn't really seem to matter with regard to the flare brightness: they always come out at +2 to +3 (even when, as in this case, the tilt is off from 67.5 degree by over 15 degrees).

Below is the image, the derived brightness profile (edit - please note that the time stated in the upper left corner of the diagram is wrong: I inadvertently mentioned the end of the exposure here instead of the flare peak time), and the observing geometry. Note how the flare peak is slightly asymmetrical, the descending branch is slightly steeper.

click images to enlarge




Saturday, 2 January 2010

Off to a good start: a GOCE and a Lacrosse 2 flare

2010 started off well with a very clear evening of January 1st. I observed GOCE (09-013A), the Lacrosses 2 & 3 (91-017A & 97-064A), the tumbling NOSS 3-4 Centaur rocket (07-027B), and the HEO objects USA 179, 184 and 200.

I was treated to two small flares: one by GOCE (09-013A) and one by Lacrosse 2 (91-017A).

The GOCE flare was a mild one to about +3, at 17:32:58.0 UTC. It was caused by the 67.5 degree panel. The time of the flare (accurate to 0.1s) yields an angle of 93.2 and tilt of 66.3 with a nominal mis distance to the theoretical flare path (angle 90 degrees, tilt 67.5 degrees) of 19.4 km at the time of observation (and closest approach to 17.1 km 1.2 seconds earlier at 17:32:56.8 UTC).

So far, all the GOCE mild flares I observed were with an angle ~93 degrees. The distance to the nominal flare path of this one was much less than for the three flares previously observed by me, but that doesn't seem to have much influence on the observed flare brightness: they were all around +3 magnitude.

Below are the picture, the derived brightness profile, and a depiction of the flare path geometry based on Simone Corbellini's Visual Sat-Flare Tracker 3D software.

click images to enlarge






Unexpectedly, I also captured a brief (<0.5s) flare/glint by Lacrosse 2 (91-017A) at 17:56:58.4 UTC. Below is the image and the resulting brightness profile:

click images to enlarge


Thursday, 31 December 2009

Last observations of the year, and 2009 at a glance

December 2009 saw a lot of clouded sky, a few clear frosty skies, and lots of snow (for our country at least). After my December 6th observations (see previous post) I observed on December 13th (under modest conditions) and December 28th (under good conditions).

Targets imaged were the HEO objects USA 179 (04-034A), USA 184 (06-027A) and USA 198 (07-060A), and the STSS Demo objects (09-052A & B); and the LEO objects Lacrosse 2 (91-017A) and Lacrosse 5 (05-016A).

These are probably my last observations for this year, as today is overcast and tonight will see fireworks. So, what did 2009 bring on the observational front?

2009 was a good year. I observed on 77 nights, obtaining a total of 953 positions (8 visually, 945 photographically). They were spread over the year as follows:





These observations concern 32 different classified objects (both payloads and rocket boosters), plus a number of special-interest non-classified objects such as Space Shuttles, GOCE, and the Iridium 33 wreckage:

click image to enlarge list



Just for fun, I have also plotted all obtained positions on an RA/Declination map:

click image to enlarge


The clustering in certain positions is because I tend to select sky areas with easily recognizable bright star patterns. This helps easy aiming of the camrea, and it also speedens initial star identifications during the astrometric reduction of the images.

Monday, 7 December 2009

An unidentified HEO object

Yesterday evening was very clear. I photographed the STSS Demo r/b (09-052C) using the EF 50/2.5 Macro, and then switched to the EF 100/2.8 Macro USM to capture the HEO objects USA 184 (06-027A) and USA 198 (07-060A).

One of the four images capturing the latter, contained an unknown object some 3 degrees south of USA 198. It is a clear trail, similar to that of USA 198 in length and direction. It shows evidence of being the capture of a brief flare. And it doesn't match any known object from the unclassified or classified catalogues.

Below is a detail of the image showing the object (the inset is a 200% blow-up). The trail is about 20 pixels long, or about 3.5'.

click image to enlarge

Friday, 4 December 2009

The STSS demo rocket

On November 30, Russel Eberst recovered the "lost" rocket stage 2009-052C from the STSS Demo launch. This allowed Ted to observe it from a preliminary elset in the early hours of Dec 1st, followed by me later that day, and a number of other observers in the days after.

During my observation, thin veil clouds were scattered in the sky, and a bright near-full moon was glowing in the sky. This lead to considerably fogged images. Nevertheless the object showed up on 3 images. It was faint near the zenith and definitely brighter while descending in the east. Below image shows it crossing Andromeda.

click image to enlarge


The object should decay somewhere in April/May 2010 (see here). This means we have another nice fastly evolving orbit to keep track on this winter and spring.

This same evening I tried to capture Lacrosse 2 (91-017A) but failed, due to the object having manoeuvred and hence being late.

Thursday, 26 November 2009

More flares by GOCE!

After my observation of GOCE (09-013A), ESA's Gravity field and steady state Ocean Circulation Explorer, mildly flaring at 19 November (see here and here), I observed it flaring again on two other occasions: November 25 and November 26th.

Times of these new flares were 17:14:43.6 UTC (Nov 25) and 17:10:25.8 UTC (Nov 26). The November 25th flare was again of about +2.5 magnitude. The November 26th flare had cloud interference.

Below are two images of the November 25th flare (one full, in negative to show the very faint non-flare part of the trail; and a detail of the flare part), and the resulting brightness profile. FWHM of the flare peak is ~0.4s.

click images to enlarge




click diagrams to enlarge




The observation of the flare of the 26th was hampered by clouds. In fact, I only just managed to photograph the satellite at culmination through a temporary gap in the cloud cover. Still, the image (see below) clearly shows it flaring again, quite similar to how it did the evening before:

click images to enlarge





Note that these flares are probably cases where my observing locality was not that near to the central flare path. In fact, the theoretical flare path for the solar panel that probably caused these two flares of the 25th and 26th was over the UK, not the Netherlands.

I have to wait untill I have the opoortunity to observe a flare when the theoretical center of the flare path is closer to my location. Earliest opportunity, weather willing, is next Sunday evening.

Tuesday, 24 November 2009

Altering tumbling period of the USA 144/Misty-2 decoy (1999-028C)

In August I used a series of photographs to determine the tumbling period of 99-028C, the enigmatic USA 144/Misty-2 "Decoy" (see here).

As the tumbling period of this object is known to alter, I am repeating the experiment. I still need some additional nights to construct a full curve: but the partial curve obtained from the November 19 observations (6 images) already shows a clear change compared to August:

click diagram to enlarge


The sinusoid is for a period of 62 seconds, which compares well to a very similar period visually determined by Ted the same night. It is nice to see the two results coming out so similar.

Back in August the period was 71 seconds. A change of 9 seconds in 3 months time.

In the diagram above, the greyed data points are data from when the trail was very close to both edges of the FOV. Their absolute levels have suffered from lens vignetting, so I scaled them to show that the trend of these points at least is similar to the trend of the period determined from the other four images. The black data points are raw, unaltered data from the latter images.

Friday, 20 November 2009

Yesterday's GOCE flare modelled

After measuring the image I obtained of yesterday's GOCE flare, I determined the flare time to be 17:40:34.9 UTC (Nov 19).

Using Simone Corbellini's excellent Visual SAT-flare Tracker 3D software I found the following observational geometry:

---------------------------------------------------
SAT ID #34602 (09013A) GOCE
ORIENTATION TYPE #4: V-Sun
ROTAX-DEC: 0 ROTAX-RA: 0
NUMBER OF SURFACES: 1
M#01 - 19/11/2009 17h40'34" - UM1 >>> .8839;77.1618;1

---------------------------------------------------

Note that the angle sun-craft-observer is close to zero (0.9 degree): sun, observer and craft are on one line.

In below graphic representation from Simone's software, the green line is the observed flare path over Earth's surface:

click image to enlarge



Knowing that the spacecraft has a fixed attitude towards the sun (see the ESA website), and Octagonal shape (meaning reflective surfaces at angles 22.5 and 67.5 degrees available), I find the following theoretical flare model:

SATELLITE SURFACE MODEL
---------------------------------------------------
SAT ID #34602 (09013A) GOCE
ORIENTATION TYPE #4: V-Sun
ROTAX-DEC: 0 ROTAX-RA: 0
NUMBER OF SURFACES: 2

M#01 - 19/11/2009 17h40'34" - UM1 >>> 0;67.5;1

M#02 - 19/11/2009 17h40'35" - UM2 >>> 0;22.5;1

---------------------------------------------------

click image to enlarge


This suggests the tilt of my observation is 10 degrees off from the nominal theoretical tilt: either the true tilt is 10 degrees different, or (and I favour that, as it is most likely) modest flaring is still visible 10 degrees on either side of the tilt axis.

In the latter case, closer approaches to the central flare path potentially might result in much brighter flares compared to yesterday's. I'll have opportunities to check that the next 3-4 days, if weather cooperates...especially the evening of 21 November might then see a potentially very nice flare for me.

Yesterday's image of the flare/glint I posted came out a bit dark after conversion to jpg. Below is a lighter version and a larger detail image.

click image to enlarge


STSS Demo 1 (USA 208) passing the Andromeda nebula

After observing it visually through the ETX-70 2 days ago (see my report here), I had some idea that the STSS Demo 2 (09-052B) and it's twin STSS Demo 1 (09-052A) were actually bright enough to be in raneg of my camera with the EF 100/2.8.

So I tried this evening, and with succes: both objects were captured. Below is one of the images, a nice picture showing the STSS Demo 1 (USA 208) passing close to M31, the Andromeda galaxy.

click image to enlarge


Some time ago I obtained the launch patches of this twin mission (STSS is an acronym for Space Tracking and Surveillance System):

Thursday, 19 November 2009

Gravity Probe GOCE (Gravity field and steady state Ocean Circulation Explorer) flaring

This evening I tried, for the second time, to capture the ESA gravity probe satellite GOCE (2009-013A) on photograph. My first attempt was on the 17th during a very low pass. This time I tried a 38 degree altitude pass, while it was moving close to mu Hercules.

Much to my excitement, the attempt was succesful, thanks to an unexpected brief flare by the spacecraft due to a reflection of sunlight from probably one of it's solar panel covered sides. I observed the flare visually, estimated it at about mag. +2.5. It shows up well on photograph, the trail fading in and out. Below is the image, shot with a Canon EOS 450D + EF 50/2.5 Macro @ 800 ISO:

click image to enlarge


GOCE (Gravity field and steady state Ocean Circulation Explorer) is a European satellite with the purpose to map the earth's gravity field in high detail. Read more about it on the ESA website here.

Wednesday, 18 November 2009

Space Shuttle Atlantis STS-129 and the STSS Demo-2

Yesterday evening it unexpectedly cleared, in front of a storm depression. This allowed me to observe Space Shuttle Atlantis STS-129, launched the day before and on its way to the ISS.

I observed it twice: first around 16:24 UTC, in deep twilight with the sun only 6 degrees under the horizon. It made a pass culminating at 40 degrees, and was easily visible, especially past culmination. Its brightness was mag. -01 or thereabout.

The second time I observed it, twilight had ended and the sky was dark and clear. The Shuttle stayed low however, entering Earth shadow at 27 degrees altitude short after rising in the west. I made this picture with the Canon EOS 450D and the EF 50/2.5:

click image to enlarge



Next three objects were targetted with the EF 100/2.8: USA 184 and USA 179, both in Molniya orbits, and the USA 144 Decoy (99-028C).

Unfortunately, due to a human error the images came out slightly out of focus. The USA 179 and the USA 144 Decoy series were still measurable though.

At the end of the session, a telescopic observation (Meade ETX-70 at 13.5x, stopwatch and Ted's Obsreduce) was done on one of the recently launched STSS Demo objects: STSS Demo-2 (USA 209), 09-052B. It was only 1.3s early relative to Ted's latest elset.