RECON: TNO occultation with 470596

Event between (470596) 08NW4 and star GA0920:17835212 with event index number of 2270335

Geocentric closest approach at 2021/11/28 22:17:56 UTC

J2000 position of star is 21:33:51.0 +02:41:12
Equinox of date position of star is 21:34:57.4 +02:47:05
Stellar brightness G=14.2, use SENSEUP=64 with the MallinCam and and exposure time of 1 seconds with the QHY174 camera.
Star is 146 degrees from the moon. Moon is 35% illuminated.
TNO apparent brightness V=21.6

TNO is 36.6 AU from the Sun and 36.7 AU from the Earth.
The TNO is moving 12.6 km/sec on the sky relative to the star, or, 1.7 arcsec/hr.
The 1-sigma error in the time of the event is 123 seconds.
The 1-sigma cross-track error in the shadow position is 1489 km.

The TNO has an absolute magnitude Hv=5.8
Diameter=424.6 km assuming a 5% albedo -- 33.8 sec chord
Diameter=173.4 km assuming a 30% albedo -- 13.8 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 470596, (2021/11/28 22:17UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:51.4 -29:30:20  1.2 38.02 155
Markab         23:05:51.2 +15:19:25  2.5 25.66 156
25 Aqr         21:40:39.9 +02:20:35  6.5  1.49 147
PPM 171943     21:35:49.6 +01:55:39  8.4  0.88 146
PPM 171927     21:35:09.5 +02:22:39  8.9  0.41 146
PPM 171932     21:35:21.0 +02:44:06 10.7  0.11 146
470596         21:34:57.5 +02:47:06 14.2       146
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 470596, (2021/11/28 22:17UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 38.02 155
Markab         23:04:45.8 +15:12:18  2.5 25.66 156
25 Aqr         21:39:33.2 +02:14:35  6.5  1.49 147
PPM 171943     21:34:42.8 +01:49:45  8.4  0.88 146
PPM 171927     21:34:02.8 +02:16:46  8.9  0.41 146
PPM 171932     21:34:14.4 +02:38:12 10.7  0.11 146
470596         21:33:51.0 +02:41:12 14.2       146
Positions are for J2000

Event circumstances last updated at 2021/11/15 00:43:16 UT

Marc W. Buie, Southwest Research Institute

RECON