RECON: TNO occultation with 12FN87

Event between 12FN87 and star GA0760:05322437 with event index number of 2417273

Geocentric closest approach at 2024/05/27 04:17:51 UTC

J2000 position of star is 15:39:35.7 -12:25:10
Equinox of date position of star is 15:40:54.8 -12:29:44
Stellar brightness G=14.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 56 degrees from the moon. Moon is 86% illuminated.
Apparent brightness V=22.5

[RECON map]
Object is 29.4 AU from the Sun and 28.4 AU from the Earth.
Apparent velocity is 23.3 km/sec on the sky relative to the star, or, 4.1 arcsec/hr.
The 1-sigma error in the time of the event is 241 seconds.
The 1-sigma cross-track error in the shadow position is 3816 km.
The sky-plane scale is 20570.5 km/arcsec.

The object has an absolute magnitude Hv=7.8
Diameter=169.8 km assuming a 5% albedo -- 7.3 sec chord
Diameter=69.3 km assuming a 30% albedo -- 3.0 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 12FN87, (2024/05/27 04:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:54.5 -26:29:02  0.9 18.26  41
27Bet Lib      15:18:19.4 -09:28:17  2.6  6.32  63
38Gam Lib      15:36:53.7 -14:52:09  3.9  2.57  56
PPM 230590     15:42:30.7 -11:56:46  8.4  0.67  56
PPM 230542     15:40:56.0 -12:16:14  9.5  0.23  56
12FN87         15:40:56.7 -12:29:50 14.9        56
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 3.7 sigma about the mid-time.
The median site spacing is 17.7 km RECON observability=0.2 and success probability=5.1%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 04:19:44 -8.6 NT Down 20.3 147.9 Low 04:04:44 - 04:34:44 4069
Kamloops 04:20:20 -3.5 CT Down 15.8 134.2 Really Low 04:05:20 - 04:35:20 3763
Kelowna 04:20:20 -4.4 CT Down 16.7 134.8 Really Low 04:05:20 - 04:35:20 3727
Peachland 04:20:21 -4.3 CT Down 16.7 134.5 Really Low 04:05:21 - 04:35:21 3715
Summerland 04:20:21 -4.5 CT Down 16.8 134.6 Really Low 04:05:21 - 04:35:21 3707
Penticton 04:20:22 -4.6 CT Down 16.9 134.7 Really Low 04:05:22 - 04:35:22 3705
Oliver 04:20:22 -4.8 CT Down 17.2 134.6 Really Low 04:05:22 - 04:35:22 3682
Anarchist Mountain Observatory 04:20:22 -5.0 CT Down 17.4 134.7 Really Low 04:05:22 - 04:35:22 3675
Okanogan 04:20:24 -5.3 CT Down 17.7 134.4 Really Low 04:05:24 - 04:35:24 3629
Brewster 04:20:25 -5.4 CT Down 17.8 134.2 Really Low 04:05:25 - 04:35:25 3607
Manson/Chelan 04:20:26 -5.4 CT Down 17.8 133.8 Really Low 04:05:26 - 04:35:26 3587
Victoria 04:20:31 -3.3 CT Down 15.8 131.1 Really Low 04:05:31 - 04:35:31 3573
Wenatchee 04:20:27 -5.6 CT Down 18.1 133.5 Really Low 04:05:27 - 04:35:27 3553
Ellensburg 04:20:29 -5.8 CT Down 18.2 133.2 Really Low 04:05:29 - 04:35:29 3521
Yakima 04:20:30 -6.0 NT Down 18.5 133.1 Really Low 04:05:30 - 04:35:30 3493
PNWRO 04:20:27 -7.3 NT Down 19.7 134.5 Really Low 04:05:27 - 04:35:27 3483
Toppenish/White Swan 04:20:30 -6.2 NT Down 18.7 133.2 Really Low 04:05:30 - 04:35:30 3481
The Dalles 04:20:33 -6.3 NT Down 18.9 132.4 Really Low 04:05:33 - 04:35:33 3413
Maupin 04:20:34 -6.7 NT Down 19.2 132.3 Really Low 04:05:34 - 04:35:34 3385
Dunrhomin 04:19:59 -18.3 Dark Down 30.5 145.7 Up 04:04:59 - 04:34:59 3320
Sisters 04:20:37 -6.9 NT Down 19.5 131.7 Really Low 04:05:37 - 04:35:37 3314
Nikitin 04:20:00 -18.4 Dark Down 30.6 145.6 Up 04:05:00 - 04:35:00 3306
Bend 04:20:36 -7.2 NT Down 19.8 131.9 Really Low 04:05:36 - 04:35:36 3302
CU-SBO 04:20:00 -18.4 Dark Down 30.7 145.5 Up 04:05:00 - 04:35:00 3300
Oregon Observatory 04:20:37 -7.3 NT Down 19.9 131.7 Really Low 04:05:37 - 04:35:37 3287
Chiloquin 04:20:41 -7.9 NT Down 20.5 131.0 Low 04:05:41 - 04:35:41 3182
Klamath Falls 04:20:41 -8.1 NT Down 20.8 131.0 Low 04:05:41 - 04:35:41 3158
Cedarville 04:20:39 -9.5 NT Down 22.2 132.1 Low 04:05:39 - 04:35:39 3137
Fall River/Burney 04:20:43 -9.1 NT Down 21.8 130.9 Low 04:05:43 - 04:35:43 3076
Gimple 04:20:44 -10.0 NT Down 22.7 131.1 Low 04:05:44 - 04:35:44 3017
Greenville 04:20:43 -9.9 NT Down 22.7 131.1 Low 04:05:43 - 04:35:43 3015
Quincy 04:20:44 -10.1 NT Down 22.8 131.0 Low 04:05:44 - 04:35:44 3000
Portola 04:20:43 -10.4 NT Down 23.1 131.4 Low 04:05:43 - 04:35:43 3000
Reno 04:20:41 -11.0 NT Down 23.7 131.8 Low 04:05:41 - 04:35:41 2992
Carson City 04:20:42 -11.2 NT Down 23.9 131.7 Low 04:05:42 - 04:35:42 2964
Yerington 04:20:40 -11.7 NT Down 24.4 132.2 Low 04:05:40 - 04:35:40 2962
Gardnerville 04:20:43 -11.4 NT Down 24.1 131.7 Low 04:05:43 - 04:35:43 2946
Hawthorne 04:20:40 -12.4 AT Down 25.1 132.5 Low 04:05:40 - 04:35:40 2936
Lee Vining 04:20:42 -12.4 AT Down 25.2 131.9 Low 04:05:42 - 04:35:42 2882
Bishop 04:20:41 -13.3 AT Down 26.0 132.3 Low 04:05:41 - 04:35:41 2848
Beatty 04:20:38 -14.5 AT Down 27.2 133.6 Low 04:05:38 - 04:35:38 2844
Patrick 04:20:32 -17.2 AT Down 29.9 135.6 Low 04:05:32 - 04:35:32 2782
Laughlin/Bullhead City 04:20:34 -17.0 AT Down 29.7 134.8 Low 04:05:34 - 04:35:34 2747
Lake Havasu City 04:20:34 -17.6 AT Down 30.3 134.8 Up 04:05:34 - 04:35:34 2697
George/Scottsdale 04:20:28 -19.6 Dark Down 32.3 136.7 Up 04:05:28 - 04:35:28 2683
Idyllwild 04:20:42 -16.7 AT Down 29.4 132.4 Low 04:05:42 - 04:35:42 2585
Wildwood 04:20:47 -15.3 AT Down 28.0 130.9 Low 04:05:47 - 04:35:47 2574
Calipatria 04:20:39 -17.8 AT Down 30.6 133.1 Up 04:05:39 - 04:35:39 2557
Yuma 04:20:37 -18.6 Dark Down 31.4 133.7 Up 04:05:37 - 04:35:37 2539

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 12FN87, (2024/05/27 04:18UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 18.26  41
27Bet Lib      15:17:00.3 -09:22:59  2.6  6.32  63
38Gam Lib      15:35:31.7 -14:47:22  3.9  2.57  56
PPM 230590     15:41:10.0 -11:52:08  8.4  0.67  56
PPM 230542     15:39:35.2 -12:11:34  9.5  0.23  56
12FN87         15:39:35.7 -12:25:10 14.9        56
Positions are for J2000

Event circumstances last updated at 2023/11/07 05:24:10 UT

Marc W. Buie, Southwest Research Institute

RECON