RECON: TNO occultation with 20YR3

Event between 20YR3 and star GA1200:01278271 with event index number of 2179293

Geocentric closest approach at 2022/12/28 23:56:31 UTC

J2000 position of star is 05:05:17.1 +30:56:15
Equinox of date position of star is 05:06:44.8 +30:58:01
Stellar brightness G=13.3, use SENSEUP=32 with the MallinCam and and exposure time of 500 milli-seconds with the QHY174 camera.
Star is 85 degrees from the moon. Moon is 39% illuminated.
TNO apparent brightness V=21.6

TNO is 17.0 AU from the Sun and 16.1 AU from the Earth.
The TNO is moving 38.7 km/sec on the sky relative to the star, or, 11.9 arcsec/hr.
The 1-sigma error in the time of the event is 59 seconds.
The 1-sigma cross-track error in the shadow position is 789 km.

The TNO has an absolute magnitude Hv=9.3
Diameter=83.9 km assuming a 5% albedo -- 2.2 sec chord
Diameter=34.3 km assuming a 30% albedo -- 0.9 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 20YR3, (2022/12/28 23:57UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:14.6 +16:33:13  0.8 15.91  76
3Iot Aur       04:58:29.7 +33:12:01  2.7  2.84  84
14 Aur         05:16:54.4 +32:42:43  5.2  2.77  87
PPM 069883     05:05:42.9 +30:31:30  7.5  0.50  85
PPM 069907     05:07:10.6 +30:41:55  9.8  0.28  85
PPM 069898     05:06:22.7 +30:55:42 10.2  0.09  85
20YR3          05:06:45.8 +30:58:02 13.3        85
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 20YR3, (2022/12/28 23:57UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 15.91  76
3Iot Aur       04:56:59.6 +33:09:58  2.7  2.84  84
14 Aur         05:15:24.3 +32:41:15  5.2  2.77  87
PPM 069883     05:04:14.6 +30:29:40  7.5  0.50  85
PPM 069907     05:05:42.1 +30:40:08  9.8  0.28  85
PPM 069898     05:04:54.1 +30:53:54 10.2  0.09  85
20YR3          05:05:17.1 +30:56:15 13.3        85
Positions are for J2000

Event circumstances last updated at 2022/10/02 04:12:13 UT

Marc W. Buie, Southwest Research Institute

RECON