imaging Kwangmyŏngsŏng-4 and flash period of UNHA-3 2016-009B

From: Marco Langbroek via Seesat-l <>
Date: Mon, 29 Feb 2016 12:52:58 +0100
Hi all,

Yesterday evening I imaged a pass of North Korea's new satellite 
Kwangmyŏngsŏng-4 (KMS-4). The sky was very clear.

I also imaged a pass of the UNHA-3 upper stage that launched it.

The rocket stage is nicely flashing (see also several of Leo's recent posts) 
with a regular periodicity. From 3 images obtained between 19:28:32 and 19:28:44 
UT (28 Feb 2016) I obtained a curve with slightly asymetric specular peaks that 
is best fitted by a composite of two sinusoids: a main period of 2.39 seconds, 
and a second lesser period of 1.195 seconds.

See curve here:

On that same URL also images of the UNHA-3 and of KMS-4.

KMS-4 (2016-009A) is faint and I therefore used the 2.8/180mm Zeiss Sonnar lens 
on my EOS 60D. That means a small field of view, and hence a short arc.

KMS-4 was captured in two images of 2 seconds each, over a total arc of ~6 
seconds. I could not see a brightness variation over that period, so either it 
is stable, or if it is tumbling at all it must be a very slow tumble.

Captured a number of other objects as well. Astrometry later.

- Marco

Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.

Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log:
Twitter: _at_Marco_Langbroek
Seesat-l mailing list
Received on Mon Feb 29 2016 - 05:53:39 UTC

This archive was generated by hypermail 2.3.0 : Mon Feb 29 2016 - 11:53:39 UTC