RECON: TNO occultation with 29981

Event between (29981) 99TD10 and star UC4-537-031608 with event index number of 114486

Geocentric closest approach at 2018/04/23 15:18:33 UTC

J2000 position of star is 06:42:37.0 +17:13:29
Equinox of date position of star is 06:43:37.5 +17:12:24
Stellar brightness R=14.5, use SENSEUP=128
Star is 33 degrees from the moon. Moon is 58% illuminated.
TNO apparent brightness V=23.6

TNO is 29.6 AU from the Sun and 29.9 AU from the Earth.
The TNO is moving 16.4 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 448 seconds.
The 1-sigma cross-track error in the shadow position is 1562 km.

The TNO has an absolute magnitude Hv=8.7
Diameter=109.7 km assuming a 5% albedo -- 6.7 sec chord
Diameter=44.8 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 29981, (2018/04/23 15:19UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:09.8 +07:24:32  0.4 15.17  47
Alhena         06:38:46.2 +16:22:56  1.9  1.43  34
26 Gem         06:43:28.2 +17:37:34  5.3  0.42  33
PPM 122886     06:42:43.2 +17:42:05  8.0  0.55  33
PPM 122928     06:44:15.7 +16:59:13  8.7  0.26  33
29981          06:43:40.7 +17:12:21 14.5        33
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 29981, (2018/04/23 15:19UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4 15.17  47
Alhena         06:37:42.8 +16:23:57  1.9  1.43  34
26 Gem         06:42:24.3 +17:38:42  5.3  0.42  33
PPM 122886     06:41:39.2 +17:43:13  8.0  0.55  33
PPM 122928     06:43:12.0 +17:00:23  8.7  0.26  33
29981          06:42:37.0 +17:13:29 14.5        33
Positions are for J2000

Event circumstances last updated at 2017/05/18 18:01:53 UT

Marc W. Buie, Southwest Research Institute

RECON