USA 276

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 14 Jul 2017 16:45:43 +0200
Updated USA 276 elements, based on observations by Alberto Rango, Leo Barhorst,
Andriy Makeyev and Marco Langbroek:

USA 276                                                  385 x 410 km
1 42689U 17022A   17195.04171765 0.00005027  00000-0  68378-4 0    08
2 42689  50.0003 260.6824 0018402 302.8771  57.0426 15.56659053    09

rms 0.005               from 17 observations 12.96 Jul - 14.05 Jul UT

This yields a close approach on July 13 close to my previous estimate in time
and distance: 28.4 +- 2 km, at 11:23:54 +- 00:00:01 UT, near 42.4 N, 149.2 W.

Approaches to closer than 500 km (nominal values, +- 2 km):

DATE            UT              KM
7/13/2017	00:35:45	473.2
7/13/2017	01:23:59	471.7
7/13/2017	02:08:21	401.6
7/13/2017	02:56:15	400.6
7/13/2017	03:40:56	330.0
7/13/2017	04:28:32	329.5
7/13/2017	05:13:32	258.4
7/13/2017	06:00:50	258.5
7/13/2017	06:46:07	186.8
7/13/2017	07:33:08	187.4
7/13/2017	08:18:43	115.1
7/13/2017	09:05:27	116.7
7/13/2017	09:51:18	 43.5
7/13/2017	10:37:45	 47.4
7/13/2017	11:23:54	 28.4 *
7/13/2017	12:10:05	 32.1
7/13/2017	12:56:29	100.0
7/13/2017	13:42:24	 99.9
7/13/2017	14:29:05	171.7
7/13/2017	15:14:44	170.6
7/13/2017	16:01:41	243.4
7/13/2017	16:47:05	241.7
7/13/2017	17:34:16	315.1
7/13/2017	18:19:26	312.9
7/13/2017	19:06:52	386.8
7/13/2017	19:51:47	384.2
7/13/2017	20:39:28	458.5
7/13/2017	21:24:08	455.4

Continued coverage of the object is worthwhile.

If USA 276 doesn't make drastic manoeuvres, the next close approach series
should be within 1-2 days of August 19.

- Marco


-----
Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

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: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
-----
_______________________________________________
Seesat-l mailing list
http://mailman.satobs.org/mailman/listinfo/seesat-l
Received on Fri Jul 14 2017 - 09:46:05 UTC

This archive was generated by hypermail 2.3.0 : Fri Jul 14 2017 - 14:46:05 UTC