RECON: TNO occultation with 04VM131

Event between 04VM131 and star GA1020:01549448 with event index number of 1985606

Geocentric closest approach at 2022/12/06 16:27:30 UTC

J2000 position of star is 06:13:53.2 +12:45:22
Equinox of date position of star is 06:15:10.1 +12:44:53
Stellar brightness G=15.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 38 degrees from the moon. Moon is 98% illuminated.
TNO apparent brightness V=23.9

TNO is 35.1 AU from the Sun and 34.2 AU from the Earth.
The TNO is moving 23.8 km/sec on the sky relative to the star, or, 3.5 arcsec/hr.
The 1-sigma error in the time of the event is 640 seconds.
The 1-sigma cross-track error in the shadow position is 3710 km.

The TNO has an absolute magnitude Hv=8.4
Diameter=127.6 km assuming a 5% albedo -- 5.4 sec chord
Diameter=52.1 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 04VM131, (2022/12/06 16:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:24.8 +07:24:34  0.4  7.06  35
Alhena         06:39:02.2 +16:22:40  1.9  6.82  42
73 Ori         06:17:02.3 +12:32:30  5.4  0.50  38
PPM 122171     06:16:26.9 +13:02:14  8.3  0.42  38
04VM131        06:15:10.7 +12:44:53 15.7        38
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 04VM131, (2022/12/06 16:27UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  7.06  35
Alhena         06:37:42.8 +16:23:57  1.9  6.82  42
73 Ori         06:15:44.9 +12:33:03  5.4  0.50  38
PPM 122171     06:15:09.3 +13:02:46  8.3  0.42  38
04VM131        06:13:53.2 +12:45:22 15.7        37
Positions are for J2000

Event circumstances last updated at 2022/10/01 04:17:00 UT

Marc W. Buie, Southwest Research Institute

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