RECON: TNO occultation with 84522

Event between (84522) 02TC302 and star GA1260:00667586 with event index number of 2437468

Geocentric closest approach at 2025/10/25 21:36:00 UTC

J2000 position of star is 03:01:00.3 +37:15:09
Equinox of date position of star is 03:02:32.2 +37:20:49
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 150 degrees from the moon. Moon is 17% illuminated.
Apparent brightness V=20.3

Object is 42.9 AU from the Sun and 42.0 AU from the Earth.
Apparent velocity is 24.5 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 75 seconds.
The 1-sigma cross-track error in the shadow position is 1891 km.

The object has an absolute magnitude Hv=3.9
Diameter=981.8 km assuming a 5% albedo -- 40.4 sec chord
Diameter=400.8 km assuming a 30% albedo -- 16.5 sec chord
Dynamical classification is 5:2EEE
 
 
 
 
 
 
 
 

Star training set for 84522, (2025/10/25 21:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:24.3 +16:33:33  0.8 29.47 165
Algol          03:09:51.5 +41:03:12  2.1  3.96 151
PPM 067993     03:01:50.5 +38:13:58  5.9  0.89 150
PPM 067980     03:01:11.0 +37:58:46  8.4  0.69 150
PPM 067989     03:01:39.3 +37:31:44 10.0  0.26 150
PPM 068007     03:02:08.5 +37:23:50 10.9  0.11 150
84522          03:02:38.4 +37:21:12 15.9       151
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 84522, (2025/10/25 21:37UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 29.47 165
Algol          03:08:10.1 +40:57:20  2.1  3.96 151
PPM 067993     03:00:11.9 +38:07:53  5.9  0.89 150
PPM 067980     02:59:32.5 +37:52:41  8.4  0.69 150
PPM 067989     03:00:01.1 +37:25:39 10.0  0.26 150
PPM 068007     03:00:30.4 +37:17:47 10.9  0.11 150
84522          03:01:00.3 +37:15:09 15.9       150
Positions are for J2000

Event circumstances last updated at 2024/03/03 06:04:28 UT

Marc W. Buie, Southwest Research Institute

RECON