RECON: TNO occultation with 308460

Event between (308460) 05SC278 and star GA1060:00280736 with event index number of 2185964

Geocentric closest approach at 2028/07/11 23:28:18 UTC

J2000 position of star is 02:50:19.4 +16:46:57
Equinox of date position of star is 02:51:39.6 +16:52:49
Stellar brightness G=15.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 57 degrees from the moon. Moon is 76% illuminated.
Apparent brightness V=22.7

Object is 32.9 AU from the Sun and 33.3 AU from the Earth.
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 247 seconds.
The 1-sigma cross-track error in the shadow position is 2235 km.

The object has an absolute magnitude Hv=7.3
Diameter=208.9 km assuming a 5% albedo -- 11.6 sec chord
Diameter=85.3 km assuming a 30% albedo -- 4.8 sec chord
Dynamical classification is 5:4E
 
 
 
 
 
 
 
 

Star training set for 308460, (2028/07/11 23:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:33.6 +16:33:52  0.8 25.28  82
Hamal          02:08:47.2 +23:35:46  2.0 12.12  49
42Pi Ari       02:50:53.4 +17:34:53  5.1  0.73  57
PPM 118518     02:47:18.6 +17:08:24  8.2  1.13  56
PPM 118603     02:52:44.4 +17:02:25  9.9  0.24  57
308460         02:51:54.9 +16:53:56 15.0        57
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 308460, (2028/07/11 23:26UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 25.28  82
Hamal          02:07:10.7 +23:27:41  2.0 12.12  49
42Pi Ari       02:49:17.5 +17:27:52  5.1  0.73  57
PPM 118518     02:45:43.1 +17:01:16  8.2  1.13  56
PPM 118603     02:51:08.7 +16:55:27  9.9  0.24  57
308460         02:50:19.4 +16:46:57 15.0        57
Positions are for J2000

Event circumstances last updated at 2023/12/18 04:44:33 UT

Marc W. Buie, Southwest Research Institute

RECON