RECON: TNO occultation with 04HX78

Event between 04HX78 and star GA0760:10997461 with event index number of 2011325

Geocentric closest approach at 2023/06/29 08:01:10 UTC

J2000 position of star is 17:56:55.3 -12:22:29
Equinox of date position of star is 17:58:13.8 -12:22:34
Stellar brightness G=16.6, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 48 degrees from the moon. Moon is 79% illuminated.
Apparent brightness V=23.2

[RECON map]
Object is 33.7 AU from the Sun and 32.7 AU from the Earth.
Apparent velocity is 23.7 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 288 seconds.
The 1-sigma cross-track error in the shadow position is 1847 km.
The sky-plane scale is 23741.6 km/arcsec.

The object has an absolute magnitude Hv=7.9
Diameter=159.2 km assuming a 5% albedo -- 6.7 sec chord
Diameter=65.0 km assuming a 30% albedo -- 2.7 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 04HX78, (2023/06/29 08:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:51.1 -26:28:56  0.9 24.90  27
35Eta Oph      17:11:43.6 -15:45:08  2.6 11.77  36
PPM 233722     17:55:26.1 -11:20:26  6.5  1.24  47
PPM 233835     17:59:59.2 -11:52:26  8.3  0.66  48
PPM 233777     17:57:55.4 -12:24:58  9.2  0.09  48
04HX78         17:58:14.5 -12:22:34 16.6        48
Positions are for equinox of date

This table contains the target star visibility for the RECON network. The observing range has been set to a maximum of 3.1 sigma about the mid-time.
The median site spacing is 21.9 km RECON observability=1.0 and success probability=0.3%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 08:00:14 -13.8 AT Down 22.8 203.4 Low 07:45:14 - 08:15:14 6656
Kamloops 08:00:52 -16.1 AT Up 26.6 188.5 Low 07:45:52 - 08:15:52 6619
Kelowna 08:00:49 -16.9 AT Up 27.3 189.5 Low 07:45:49 - 08:15:49 6577
Peachland 08:00:50 -17.0 AT Up 27.4 189.2 Low 07:45:50 - 08:15:50 6572
Summerland 08:00:50 -17.2 AT Up 27.6 189.3 Low 07:45:50 - 08:15:50 6564
Penticton 08:00:49 -17.2 AT Up 27.6 189.5 Low 07:45:49 - 08:15:49 6560
Oliver 08:00:49 -17.6 AT Up 28.0 189.5 Low 07:45:49 - 08:15:49 6542
Anarchist Mountain Observatory 08:00:49 -17.8 AT Up 28.1 189.7 Low 07:45:49 - 08:15:49 6533
Victoria 08:01:01 -18.2 Dark Up 29.0 185.3 Low 07:46:01 - 08:16:01 6507
Okanogan 08:00:49 -18.4 Dark Up 28.8 189.5 Low 07:45:49 - 08:15:49 6498
Brewster 08:00:49 -18.7 Dark Up 29.1 189.3 Low 07:45:49 - 08:15:49 6483
Manson/Chelan 08:00:51 -18.9 Dark Up 29.3 188.9 Low 07:45:51 - 08:15:51 6472
Wenatchee 08:00:51 -19.4 Dark Up 29.8 188.8 Low 07:45:51 - 08:15:51 6446
Ellensburg 08:00:51 -19.8 Dark Up 30.2 188.6 Up 07:45:51 - 08:15:51 6423
Yakima 08:00:51 -20.2 Dark Up 30.6 188.6 Up 07:45:51 - 08:15:51 6400
Toppenish/White Swan 08:00:51 -20.4 Dark Up 30.8 188.8 Up 07:45:51 - 08:15:51 6387
PNWRO 08:00:46 -20.8 Dark Up 31.0 190.5 Up 07:45:46 - 08:15:46 6365
The Dalles 08:00:53 -21.1 Dark Up 31.7 188.0 Up 07:45:53 - 08:15:53 6342
Maupin 08:00:52 -21.6 Dark Up 32.1 188.1 Up 07:45:52 - 08:15:52 6317
Sisters 08:00:53 -22.4 Dark Up 33.0 187.7 Up 07:45:53 - 08:15:53 6265
Bend 08:00:53 -22.7 Dark Up 33.2 188.0 Up 07:45:53 - 08:15:53 6250
Oregon Observatory 08:00:53 -22.9 Dark Up 33.4 187.8 Up 07:45:53 - 08:15:53 6240
Chiloquin 08:00:54 -24.2 Dark Up 34.8 187.5 Up 07:45:54 - 08:15:54 6158
Klamath Falls 08:00:53 -24.5 Dark Up 35.1 187.6 Up 07:45:53 - 08:15:53 6136
Cedarville 08:00:48 -25.2 Dark Up 35.6 189.6 Up 07:45:48 - 08:15:48 6090
Fall River/Burney 08:00:52 -25.7 Dark Up 36.2 188.2 Up 07:45:52 - 08:15:52 6058
Greenville 08:00:50 -26.6 Dark Up 37.1 188.8 Up 07:45:50 - 08:15:50 5998
Gimple 08:00:49 -26.6 Dark Up 37.1 188.9 Up 07:45:49 - 08:15:49 5998
Quincy 08:00:50 -26.8 Dark Up 37.3 188.8 Up 07:45:50 - 08:15:50 5984
Portola 08:00:48 -26.9 Dark Up 37.3 189.4 Up 07:45:48 - 08:15:48 5976
Dunrhomin 07:59:56 -25.2 Dark Up 33.3 206.9 Up 07:44:56 - 08:14:56 5961
Reno 08:00:45 -27.2 Dark Up 37.5 190.2 Up 07:45:45 - 08:15:45 5957
Nikitin 07:59:56 -25.4 Dark Up 33.5 206.9 Up 07:44:56 - 08:14:56 5949
CU-SBO 07:59:56 -25.5 Dark Up 33.6 206.8 Up 07:44:56 - 08:14:56 5945
Carson City 08:00:45 -27.6 Dark Up 37.9 190.3 Up 07:45:45 - 08:15:45 5932
Yerington 08:00:43 -27.8 Dark Up 38.0 191.1 Up 07:45:43 - 08:15:43 5918
Gardnerville 08:00:45 -27.8 Dark Up 38.1 190.4 Up 07:45:45 - 08:15:45 5915
Hawthorne 08:00:41 -28.2 Dark Up 38.3 191.8 Up 07:45:41 - 08:15:41 5885
Lee Vining 08:00:42 -28.8 Dark Up 39.0 191.3 Up 07:45:42 - 08:15:42 5847
Bishop 08:00:39 -29.4 Dark Up 39.4 192.3 Up 07:45:39 - 08:15:39 5803
Beatty 08:00:33 -29.8 Dark Up 39.6 194.4 Up 07:45:33 - 08:15:33 5767
Patrick 08:00:21 -31.1 Dark Up 40.4 198.3 Up 07:45:21 - 08:15:21 5651
Laughlin/Bullhead City 08:00:24 -31.4 Dark Up 40.8 197.5 Up 07:45:24 - 08:15:24 5634
Lake Havasu City 08:00:23 -32.1 Dark Up 41.4 197.9 Up 07:45:23 - 08:15:23 5582
Wildwood 08:00:38 -32.7 Dark Up 42.7 192.6 Up 07:45:38 - 08:15:38 5560
Idyllwild 08:00:31 -33.0 Dark Up 42.6 195.1 Up 07:45:31 - 08:15:31 5531
George/Scottsdale 08:00:13 -32.6 Dark Up 41.4 201.2 Up 07:45:13 - 08:15:13 5515
Calipatria 08:00:26 -33.5 Dark Up 43.0 196.8 Up 07:45:26 - 08:15:26 5480
Yuma 08:00:23 -33.9 Dark Up 43.2 198.1 Up 07:45:23 - 08:15:23 5444

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 04HX78, (2023/06/29 08:01UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 24.90  27
35Eta Oph      17:10:22.7 -15:43:29  2.6 11.77  36
PPM 233722     17:54:07.6 -11:20:15  6.5  1.24  47
PPM 233835     17:58:40.4 -11:52:25  8.3  0.66  48
PPM 233777     17:56:36.2 -12:24:52  9.2  0.09  48
04HX78         17:56:55.3 -12:22:29 16.6        48
Positions are for J2000

Event circumstances last updated at 2023/04/18 02:28:10 UT

Marc W. Buie, Southwest Research Institute

RECON