RECON: TNO occultation with 04HC79

Event between 04HC79 and star GA0660:09201301 with event index number of 1969325

Geocentric closest approach at 2022/05/25 21:09:57 UTC

J2000 position of star is 17:03:46.1 -23:01:32
Equinox of date position of star is 17:05:06.6 -23:03:19
Stellar brightness G=15.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 116 degrees from the moon. Moon is 19% illuminated.
TNO apparent brightness V=23.1

TNO is 39.8 AU from the Sun and 38.8 AU from the Earth.
The TNO is moving 23.6 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 654 seconds.
The 1-sigma cross-track error in the shadow position is 3494 km.

The TNO has an absolute magnitude Hv=7.1
Diameter=232.3 km assuming a 5% albedo -- 9.9 sec chord
Diameter=94.8 km assuming a 30% albedo -- 4.0 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 04HC79, (2022/05/25 21:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:47.1 -26:28:47  0.9  8.51 122
35Eta Oph      17:11:39.9 -15:45:04  2.6  7.47 115
PPM 266403     17:07:32.2 -21:35:37  6.3  1.56 115
PPM 266324     17:04:42.9 -23:10:55  7.5  0.16 116
PPM 266339     17:05:16.9 -22:54:40  8.8  0.15 115
04HC79         17:05:07.3 -23:03:20 15.2       115
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 04HC79, (2022/05/25 21:10UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  8.51 122
35Eta Oph      17:10:22.7 -15:43:29  2.6  7.47 115
PPM 266403     17:06:11.8 -21:33:54  6.3  1.56 115
PPM 266324     17:03:21.6 -23:09:06  7.5  0.16 116
PPM 266339     17:03:55.8 -22:52:52  8.8  0.15 115
04HC79         17:03:46.1 -23:01:32 15.2       115
Positions are for J2000

Event circumstances last updated at 2022/03/13 02:12:40 UT

Marc W. Buie, Southwest Research Institute

RECON