RECON: TNO occultation with 04OP15

Event between 04OP15 and star UC4-391-126458 with event index number of 208126

Geocentric closest approach at 2018/07/21 01:35:24 UTC

J2000 position of star is 20:25:51.8 -11:59:04
Equinox of date position of star is 20:26:50.1 -11:55:33
Stellar brightness R=13.1, use SENSEUP=32
Star is 82 degrees from the moon. Moon is 63% illuminated.
TNO apparent brightness V=22.8

TNO is 38.0 AU from the Sun and 37.0 AU from the Earth.
The TNO is moving 24.6 km/sec on the sky relative to the star, or, 3.3 arcsec/hr.
The 1-sigma error in the time of the event is 170 seconds.
The 1-sigma cross-track error in the shadow position is 4612 km.

The TNO has an absolute magnitude Hv=7.0
Diameter=237.7 km assuming a 5% albedo -- 9.6 sec chord
Diameter=97.0 km assuming a 30% albedo -- 3.9 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 04OP15, (2018/07/21 01:35UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:40.3 -29:31:25  1.2 39.36 111
Tarazed        19:47:08.5 +10:39:35  2.7 24.65  77
8Nu Cap        20:21:41.5 -12:41:59  4.7  1.49  81
PPM 237434     20:27:19.0 -12:09:19  7.7  0.26  82
PPM 237427     20:27:15.4 -11:55:54  9.4  0.09  82
04OP15         20:26:53.0 -11:55:22 13.1        83
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 04OP15, (2018/07/21 01:35UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.5 -29:37:23  1.2 39.36 111
Tarazed        19:46:15.6 +10:36:48  2.7 24.65  77
8Nu Cap        20:20:39.8 -12:45:33  4.7  1.49  81
PPM 237434     20:26:17.7 -12:13:01  7.7  0.26  82
PPM 237427     20:26:14.2 -11:59:36  9.4  0.09  82
04OP15         20:25:51.8 -11:59:04 13.1        82
Positions are for J2000

Event circumstances last updated at 2017/09/01 16:58:07 UT

Marc W. Buie, Southwest Research Institute

RECON