RECON: TNO occultation with 5145

Event between (5145) Pholus and star GA0760:14945737 with event index number of 1225834

Geocentric closest approach at 2023/05/08 10:50:15 UTC

J2000 position of star is 18:33:40.3 -12:58:23
Equinox of date position of star is 18:34:59.0 -12:57:13
Stellar brightness G=15.5, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 21 degrees from the moon. Moon is 91% illuminated.
Apparent brightness V=21.9

[RECON map]
Object is 29.7 AU from the Sun and 29.1 AU from the Earth.
Apparent velocity is 15.1 km/sec on the sky relative to the star, or, 2.6 arcsec/hr.
The 1-sigma error in the time of the event is 171 seconds.
The 1-sigma cross-track error in the shadow position is 1507 km.
The sky-plane scale is 21082.8 km/arcsec.

The object has an absolute magnitude Hv=7.1
Diameter=229.1 km assuming a 5% albedo -- 15.4 sec chord
Diameter=93.5 km assuming a 30% albedo -- 6.3 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 5145, (2023/05/08 10:50UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.6 -26:28:54  0.9 32.07  13
Nunki          18:56:42.7 -26:15:56  2.0 14.26  20
PPM 234707     18:34:59.1 -14:50:04  6.1  1.88  20
PPM 234724     18:35:34.8 -13:02:43  8.2  0.17  21
5145           18:34:59.2 -12:57:13 15.5        21
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 5.0 sigma about the mid-time.
The median site spacing is 23.7 km RECON observability=0.7 and success probability=22.7%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 10:50:40 -4.7 CT Up 24.8 184.7 Low 10:35:57 - 11:05:24 1422
Kamloops 10:51:45 -12.3 AT Up 25.8 169.4 Low 10:37:01 - 11:06:28 1228
Kelowna 10:51:41 -12.5 AT Up 26.7 170.2 Low 10:36:58 - 11:06:25 1195
Peachland 10:51:43 -12.7 AT Up 26.8 169.9 Low 10:36:59 - 11:06:26 1186
Summerland 10:51:42 -12.8 AT Up 26.9 170.0 Low 10:36:59 - 11:06:26 1180
Penticton 10:51:42 -12.8 AT Up 27.0 170.1 Low 10:36:58 - 11:06:25 1177
Oliver 10:51:42 -13.0 AT Up 27.3 170.1 Low 10:36:59 - 11:06:26 1158
Anarchist Mountain Observatory 10:51:41 -13.1 AT Up 27.5 170.3 Low 10:36:58 - 11:06:25 1152
Okanogan 10:51:42 -13.6 AT Up 28.1 170.0 Low 10:36:59 - 11:06:26 1114
Brewster 10:51:44 -13.9 AT Up 28.4 169.7 Low 10:37:00 - 11:06:27 1097
Manson/Chelan 10:51:46 -14.2 AT Up 28.5 169.3 Low 10:37:02 - 11:06:29 1081
Victoria 10:52:00 -15.2 AT Up 27.5 165.9 Low 10:37:17 - 11:06:44 1079
Wenatchee 10:51:46 -14.7 AT Up 29.0 169.1 Low 10:37:03 - 11:06:30 1052
Ellensburg 10:51:48 -15.1 AT Up 29.4 168.8 Low 10:37:04 - 11:06:31 1027
Yakima 10:51:48 -15.4 AT Up 29.8 168.7 Low 10:37:05 - 11:06:32 1003
Toppenish/White Swan 10:51:48 -15.4 AT Up 30.0 168.9 Low 10:37:04 - 11:06:31 992
PNWRO 10:51:40 -15.0 AT Up 30.5 170.5 Up 10:36:57 - 11:06:24 988
The Dalles 10:51:52 -16.4 AT Up 30.6 167.9 Up 10:37:08 - 11:06:35 937
Maupin 10:51:51 -16.6 AT Up 31.1 168.0 Up 10:37:08 - 11:06:35 913
Sisters 10:51:54 -17.5 AT Up 31.9 167.4 Up 10:37:11 - 11:06:38 854
Bend 10:51:53 -17.6 AT Up 32.1 167.6 Up 10:37:10 - 11:06:37 843
Oregon Observatory 10:51:54 -17.8 AT Up 32.3 167.4 Up 10:37:10 - 11:06:37 830
Dunrhomin 10:50:27 -11.1 NT Up 36.6 186.1 Up 10:35:43 - 11:05:10 767
Nikitin 10:50:27 -11.3 NT Up 36.8 186.1 Up 10:35:44 - 11:05:11 755
CU-SBO 10:50:27 -11.3 NT Up 36.8 186.0 Up 10:35:44 - 11:05:11 750
Chiloquin 10:51:57 -18.9 Dark Up 33.5 166.8 Up 10:37:13 - 11:06:40 741
Klamath Falls 10:51:56 -19.1 Dark Up 33.8 166.8 Up 10:37:13 - 11:06:40 720
Cedarville 10:51:48 -18.8 Dark Up 34.8 168.6 Up 10:37:05 - 11:06:32 695
Fall River/Burney 10:51:55 -19.8 Dark Up 35.1 167.1 Up 10:37:11 - 11:06:38 647
Gimple 10:51:53 -20.2 Dark Up 36.0 167.6 Up 10:37:09 - 11:06:36 593
Greenville 10:51:53 -20.2 Dark Up 36.0 167.5 Up 10:37:09 - 11:06:36 592
Quincy 10:51:53 -20.4 Dark Up 36.2 167.4 Up 10:37:10 - 11:06:37 578
Portola 10:51:50 -20.2 Dark Up 36.4 168.0 Up 10:37:07 - 11:06:34 576
Reno 10:51:47 -20.1 Dark Up 36.8 168.7 Up 10:37:04 - 11:06:31 566
Carson City 10:51:47 -20.3 Dark Up 37.1 168.7 Up 10:37:03 - 11:06:30 542
Yerington 10:51:44 -20.1 Dark Up 37.4 169.4 Up 10:37:00 - 11:06:27 536
Gardnerville 10:51:47 -20.5 Dark Up 37.4 168.7 Up 10:37:04 - 11:06:31 525
Hawthorne 10:51:41 -20.1 Dark Up 37.9 170.0 Up 10:36:57 - 11:06:24 510
Lee Vining 10:51:44 -20.8 Dark Up 38.4 169.3 Up 10:37:00 - 11:06:27 465
Bishop 10:51:39 -20.8 Dark Up 39.1 170.1 Up 10:36:56 - 11:06:23 431
Beatty 10:51:30 -20.2 Dark Up 39.8 172.0 Up 10:36:47 - 11:06:14 418
Patrick 10:51:13 -19.4 Dark Up 41.5 175.5 Up 10:36:30 - 11:05:57 344
Laughlin/Bullhead City 10:51:18 -20.0 Dark Up 41.7 174.6 Up 10:36:34 - 11:06:01 317
Lake Havasu City 10:51:16 -20.3 Dark Up 42.4 174.8 Up 10:36:32 - 11:05:59 270
George/Scottsdale 10:51:01 -19.2 Dark Up 43.3 178.0 Up 10:36:17 - 11:05:44 240
Wildwood 10:51:41 -23.2 Dark Up 42.3 169.3 Up 10:36:57 - 11:06:24 186
Idyllwild 10:51:30 -22.2 Dark Up 42.9 171.7 Up 10:36:46 - 11:06:13 184
Calipatria 10:51:23 -21.9 Dark Up 43.6 173.1 Up 10:36:39 - 11:06:06 151
Yuma 10:51:17 -21.6 Dark Up 44.2 174.3 Up 10:36:34 - 11:06:01 128

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 5145, (2023/05/08 10:50UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 32.07  13
Nunki          18:55:15.9 -26:17:49  2.0 14.26  20
PPM 234707     18:33:39.1 -14:51:14  6.1  1.88  20
PPM 234724     18:34:15.8 -13:03:54  8.2  0.17  21
5145           18:33:40.3 -12:58:23 15.5        21
Positions are for J2000

Event circumstances last updated at 2023/04/19 02:33:55 UT

Marc W. Buie, Southwest Research Institute

RECON