RECON: TNO occultation with 517717

Event between (517717) 15KZ120 and star GA1460:05616484 with event index number of 267525

Geocentric closest approach at 2020/02/25 22:13:43 UTC

J2000 position of star is 19:04:23.3 +57:15:50
Equinox of date position of star is 19:04:44.7 +57:17:41
Stellar brightness G=12.8, use SENSEUP=32
Star is 87 degrees from the moon. Moon is 5% illuminated.
TNO apparent brightness V=19.9

TNO is 8.6 AU from the Sun and 8.7 AU from the Earth.
The TNO is moving 43.5 km/sec on the sky relative to the star, or, 24.8 arcsec/hr.
The 1-sigma error in the time of the event is 11 seconds.
The 1-sigma cross-track error in the shadow position is 426 km.

The TNO has an absolute magnitude Hv=10.0
Diameter=60.3 km assuming a 5% albedo -- 1.4 sec chord
Diameter=24.6 km assuming a 30% albedo -- 0.6 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 517717, (2020/02/25 22:14UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:37.3 +38:48:12  0.0 19.02  88
Etamin         17:57:04.5 +51:29:14  2.2 11.39  96
53 Dra         19:12:03.4 +56:53:39  5.1  1.07  86
PPM 037041     19:03:19.1 +56:38:44  8.4  0.68  87
PPM 037073     19:05:25.4 +57:09:27  9.3  0.16  86
517717         19:04:45.0 +57:17:42 12.8        87
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 517717, (2020/02/25 22:14UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.7 +38:47:07  0.0 19.02  88
Etamin         17:56:36.3 +51:29:20  2.2 11.39  96
53 Dra         19:11:40.6 +56:51:34  5.1  1.07  86
PPM 037041     19:02:56.5 +56:36:55  8.4  0.68  87
PPM 037073     19:05:03.4 +57:07:33  9.3  0.16  86
517717         19:04:23.3 +57:15:50 12.8        87
Positions are for J2000

Event circumstances last updated at 2019/11/26 22:21:18 UT

Marc W. Buie, Southwest Research Institute

RECON