Re: GSSAP 3 and 4

From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 27 Aug 2016 14:27:14 -0700
On 8/27/2016 1:40 PM, Mike McCants via Seesat-l wrote:
> Scott Tilley has observed a pair of unknowns with similar optical
> characteristics in near-zero inclination geosync orbits to the
> west of the orbital insertion point for the new GSSAP launch.

Thanks Mike for posting your analysis of my observations.

For the benefit of those interested, I will detail the observations and 
provide a timeline.

In my Seesat-l post of Aug 23, 2016, I reported an UNID 99119.

http://www.satobs.org/seesat/Aug-2016/0136.html

Later review of the data revealed a second UNID 99120.  Both UNIDs faded 
up from being invisible and peaked quite brightly and faded to 
invisible.  Interesting this peak in brightness corresponded to the 
passing of MUOS-5 [41622] at its apogee near where the UNIDs were observed.

I shared these further observations and the apparent correlation with 
MUOS-5 off list with Mike.

Here is a summary of the observations of Aug 23rd:

99119 16 736A   8049 G 20160823062526488 27 25 2119378-071582 17 S
99119 16 736A   8049 G 20160823063525499 27 25 2129330-071583 17 S
99119 16 736A   8049 G 20160823064525547 27 25 2139292-071592 17 S
99119 16 736A   8049 G 20160823065527496 27 25 2149301-071596 17 S
99119 16 736A   8049 G 20160823070525556 27 25 2159231-071605 17 S
99119 16 736A   8049 G 20160823071525518 27 25 2209203-071604 17 S
99119 16 736A   8049 G 20160823072525566 27 25 2219169-071609 17 S
99119 16 736A   8049 G 20160823073525528 27 25 2229141-071609 17 S
99119 16 736A   8049 G 20160823074526526 27 25 2239142-071600 17

99120 16 736A   8049 G 20160823062526488 27 25 2124082-071660 17 S
99120 16 736A   8049 G 20160823063525499 27 25 2134073-071653 17 S
99120 16 736A   8049 G 20160823064525547 27 25 2144083-071659 17 S
99120 16 736A   8049 G 20160823070525556 27 25 2204106-071672 17 S
99120 16 736A   8049 G 20160823071525518 27 25 2214120-071666 17 S
99120 16 736A   8049 G 20160823072525566 27 25 2224137-071666 17 S
99120 16 736A   8049 G 20160823073525528 27 25 2234155-071661 17 S

Here is an image of the UNIDs at maximum brightness:
https://dl.dropboxusercontent.com/u/15916951/gssap_payloads.png

Here is a plot of there relationship to MUOS-5:
https://dl.dropboxusercontent.com/u/15916951/gssap_muos5.png

Here is an animated GIF of the sequence of images:
https://dl.dropboxusercontent.com/u/15916951/99119_99120.gif

On Aug 24th, I monitored the same area and saw nothing out of the 
ordinary despite excellent observing conditions the entire night.

On August 25th, UNID 99119 was observed behaving as noted above and 
corresponding to the passage of MUOS-5.

99119 16 738A   8049 G 20160825064525547 27 25 2140101-071761 17 S
99119 16 738A   8049 G 20160825065525508 27 25 2150095-071747 17 S
99119 16 738A   8049 G 20160825070525556 27 25 2200102-071743 17 S
99119 16 738A   8049 G 20160825071525518 27 25 2210108-071750 17 S
99119 16 738A   8049 G 20160825072525566 27 25 2220116-071752 17 S
99119 16 738A   8049 G 20160825073525528 27 25 2230124-071754 17 S

No observations were attempted on Aug 26th due to poor conditions.

On August 27th both UNIDs were observed behaving as above when MUOS-5 
passed by...

99119 16 740A   8049 G 20160827071525518 27 25 2218121-071810 17 S
99119 16 740A   8049 G 20160827072526516 27 25 2228158-071812 17 S
99119 16 740A   8049 G 20160827073525528 27 25 2238158-071814 17 S
99119 16 740A   8049 G 20160827074526526 27 25 2248189-071811 17 S
99119 16 740A   8049 G 20160827075525537 27 25 2258188-071795 17 S

99120 16 740A   8049 G 20160827065526545 27 25 2152255-071823 17 S
99120 16 740A   8049 G 20160827070525556 27 25 2202245-071817 17 S
99120 16 740A   8049 G 20160827071525518 27 25 2212246-071821 17 S
99120 16 740A   8049 G 20160827072526516 27 25 2222284-071826 17 S
99120 16 740A   8049 G 20160827073525528 27 25 2232272-071830 17 S
99120 16 740A   8049 G 20160827074526526 27 25 2242296-071829 17 S
99120 16 740A   8049 G 20160827075525537 27 25 2252290-071822 17 S

The peak brightness of the UNIDs resembled the brightness of other 
nearby GEO satellites.Observations were conducted all night long without 
interruption except by haze/cloud periodically on some nights.

The equipment used was a Canon T3i camera and 85mm f/1.4lens with 10 sec 
exposures.

Regards,
Scott Tilley

ROBERTS CREEK 1:
8049 ST 49.4348 -123.6685 40. Scott Tilley
ROBERTS CREEK 2:
8048 ST 49.4175 -123.6420 1. Scott Tilley


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Received on Sat Aug 27 2016 - 16:28:01 UTC

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