RECON: TNO occultation with 04VV130

Event between 04VV130 and star GA1260:01667756 with event index number of 2567250

Geocentric closest approach at 2021/12/20 00:29:03 UTC

J2000 position of star is 05:04:34.8 +36:41:58
Equinox of date position of star is 05:06:03.4 +36:43:42
Stellar brightness G=16.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 21 degrees from the moon. Moon is 99% illuminated.
TNO apparent brightness V=22.6

TNO is 32.1 AU from the Sun and 31.1 AU from the Earth.
The TNO is moving 24.5 km/sec on the sky relative to the star, or, 3.9 arcsec/hr.
The 1-sigma error in the time of the event is 116 seconds.
The 1-sigma cross-track error in the shadow position is 1762 km.

The TNO has an absolute magnitude Hv=7.5
Diameter=194.1 km assuming a 5% albedo -- 7.9 sec chord
Diameter=79.2 km assuming a 30% albedo -- 3.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 
 
 

Star training set for 04VV130, (2021/12/20 00:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.0 +16:33:06  0.8 21.17  29
3Iot Aur       04:58:25.7 +33:11:56  2.7  3.86  22
PPM 069764     04:57:48.2 +36:12:06  6.0  1.74  23
PPM 069870     05:05:07.5 +37:17:52  7.1  0.60  22
PPM 069878     05:05:29.1 +36:45:00  9.1  0.12  21
04VV130        05:06:03.6 +36:43:42 16.5        21
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 04VV130, (2021/12/20 00:29UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 21.17  29
3Iot Aur       04:56:59.6 +33:09:58  2.7  3.86  22
PPM 069764     04:56:20.0 +36:10:07  6.0  1.74  23
PPM 069870     05:03:38.2 +37:16:06  7.1  0.60  22
PPM 069878     05:04:00.3 +36:43:15  9.1  0.12  21
04VV130        05:04:34.8 +36:41:58 16.5        21
Positions are for J2000

Event circumstances last updated at 2021/12/03 01:42:57 UT

Marc W. Buie, Southwest Research Institute

RECON