RECON: TNO occultation with 248835

Event between (248835) 06SX368 and star GA1240:01538488 with event index number of 1060719

Geocentric closest approach at 2021/03/15 05:32:36 UTC

J2000 position of star is 05:04:57.1 +35:38:57
Equinox of date position of star is 05:06:21.4 +35:40:36
Stellar brightness G=15.9, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 65 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=22.1

[RECON map]
TNO is 17.1 AU from the Sun and 17.1 AU from the Earth.
The TNO is moving 13.9 km/sec on the sky relative to the star, or, 4.0 arcsec/hr.
The 1-sigma error in the time of the event is 126 seconds.
The 1-sigma cross-track error in the shadow position is 1763 km.
The sky-plane scale is 12435.4 km/arcsec.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 5.5 sec chord
Diameter=31.0 km assuming a 30% albedo -- 2.2 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 248835, (2021/03/15 05:33UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:08.4 +16:33:01  0.8 20.20  54
3Iot Aur       04:58:22.7 +33:11:52  2.7  2.98  63
PPM 069764     04:57:45.2 +36:12:02  6.0  1.82  64
PPM 069909     05:07:14.4 +35:52:24  7.6  0.26  65
PPM 069897     05:06:17.1 +35:31:43 10.0  0.15  65
248835         05:06:22.0 +35:40:37 15.9        65
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 3.8 km RECON observability=1.0 and success probability=1.9%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Dunrhomin 05:33:44 -46.1 Dark Down 32.4 291.5 Up 05:22:44 - 05:44:44 5668
George/Scottsdale 05:35:16 -47.5 Dark Down 34.6 293.0 Up 05:24:16 - 05:46:16 5189
Patrick 05:35:04 -45.2 Dark Down 36.8 291.2 Up 05:24:04 - 05:46:04 5103
Kingman/Dolan Springs 05:35:07 -45.2 Dark Down 36.9 291.2 Up 05:24:07 - 05:46:07 5087
Lake Havasu City 05:35:11 -45.5 Dark Down 36.8 291.6 Up 05:24:11 - 05:46:11 5056
Laughlin/Bullhead City 05:35:06 -44.9 Dark Down 37.3 291.1 Up 05:24:06 - 05:46:06 5055
Parker 05:35:14 -45.7 Dark Down 36.7 291.9 Up 05:24:14 - 05:46:14 5050
Mohave Valley 05:35:08 -45.1 Dark Down 37.2 291.3 Up 05:24:08 - 05:46:08 5049
Henderson 05:35:00 -44.0 Dark Down 37.9 290.3 Up 05:24:00 - 05:46:00 5048
Blythe 05:35:18 -45.9 Dark Down 36.7 292.2 Up 05:24:18 - 05:46:18 5020
Indian Springs 05:34:56 -43.3 Dark Down 38.6 289.6 Up 05:23:56 - 05:45:56 5017
Yuma 05:35:25 -46.4 Dark Down 36.3 292.8 Up 05:24:25 - 05:46:25 4996
Clarence Fulton 05:33:12 -32.0 Dark Down 44.6 275.5 Up 05:22:12 - 05:44:12 4979
Anarchist Mountain Observatory 05:33:21 -32.8 Dark Down 44.4 276.7 Up 05:22:21 - 05:44:21 4970
PNWRO 05:33:44 -35.1 Dark Down 43.6 279.9 Up 05:22:44 - 05:44:44 4970
Kelowna 05:33:14 -32.2 Dark Down 44.6 275.7 Up 05:22:14 - 05:44:14 4969
Tonasket 05:33:23 -33.0 Dark Down 44.4 276.9 Up 05:22:23 - 05:44:23 4964
Penticton 05:33:17 -32.3 Dark Down 44.6 276.0 Up 05:22:17 - 05:44:17 4963
Oliver 05:33:20 -32.6 Dark Down 44.6 276.4 Up 05:22:20 - 05:44:20 4960
Pasco 05:33:43 -34.8 Dark Down 43.8 279.5 Up 05:22:43 - 05:44:43 4959
Beatty 05:34:54 -42.4 Dark Down 39.6 289.0 Up 05:23:54 - 05:45:54 4958
Summerland 05:33:18 -32.2 Dark Down 44.7 275.9 Up 05:22:18 - 05:44:18 4957
Peachland 05:33:15 -32.1 Dark Down 44.8 275.6 Up 05:22:15 - 05:44:15 4954
Okanogan 05:33:26 -33.1 Dark Down 44.5 277.2 Up 05:22:26 - 05:44:26 4953
Tonopah 05:34:46 -41.3 Dark Down 40.3 287.8 Up 05:23:46 - 05:45:46 4953
Calipatria 05:35:22 -45.6 Dark Down 37.2 292.2 Up 05:24:22 - 05:46:22 4950
Brewster 05:33:28 -33.2 Dark Down 44.6 277.3 Up 05:22:28 - 05:44:28 4940
Manson/Chelan 05:33:30 -33.2 Dark Down 44.8 277.3 Up 05:22:30 - 05:44:30 4919
Wenatchee 05:33:34 -33.4 Dark Down 44.8 277.6 Up 05:22:34 - 05:44:34 4906
Toppenish/White Swan 05:33:42 -34.1 Dark Down 44.7 278.6 Up 05:22:42 - 05:44:42 4891
Idyllwild 05:35:18 -44.4 Dark Down 38.4 291.4 Up 05:24:18 - 05:46:18 4891
Ellensburg 05:33:37 -33.6 Dark Down 44.9 277.9 Up 05:22:37 - 05:44:37 4890
Yakima 05:33:41 -33.8 Dark Down 44.9 278.3 Up 05:22:41 - 05:44:41 4884
Hawthorne 05:34:43 -40.2 Dark Down 41.5 286.9 Up 05:23:43 - 05:45:43 4876
Bishop 05:34:51 -41.1 Dark Down 41.0 287.9 Up 05:23:51 - 05:45:51 4867
Cedarville 05:33:44 -37.3 Dark Down 43.6 283.4 Up 05:22:44 - 05:44:44 4863
Goldendale 05:33:44 -34.2 Dark Down 44.9 278.9 Up 05:22:44 - 05:44:44 4861
Lakeview 05:33:44 -36.7 Dark Down 43.9 282.7 Up 05:22:44 - 05:44:44 4857
Yerington 05:34:39 -39.6 Dark Down 42.1 286.2 Up 05:23:39 - 05:45:39 4852
Paisley 05:33:44 -36.3 Dark Down 44.1 282.1 Up 05:22:44 - 05:44:44 4849
Maupin 05:33:44 -34.5 Dark Down 45.0 279.4 Up 05:22:44 - 05:44:44 4840
The Dalles 05:33:44 -34.1 Dark Down 45.1 278.9 Up 05:22:44 - 05:44:44 4838
Lee Vining 05:34:47 -40.2 Dark Down 41.7 287.1 Up 05:23:47 - 05:45:47 4835
North Lake 05:33:44 -35.8 Dark Down 44.5 281.4 Up 05:22:44 - 05:44:44 4832
Redmond 05:33:44 -35.0 Dark Down 44.9 280.2 Up 05:22:44 - 05:44:44 4826
Reno 05:34:35 -38.8 Dark Down 42.7 285.5 Up 05:23:35 - 05:45:35 4823
Carson City 05:34:38 -39.0 Dark Down 42.6 285.8 Up 05:23:38 - 05:45:38 4817
Bend 05:33:44 -35.0 Dark Down 45.0 280.4 Up 05:22:44 - 05:44:44 4815
Gardnerville 05:34:39 -39.2 Dark Down 42.5 286.0 Up 05:23:39 - 05:45:39 4815
Oregon Observatory 05:33:44 -35.1 Dark Down 45.0 280.5 Up 05:22:44 - 05:44:44 4806
Sisters 05:33:44 -34.7 Dark Down 45.2 280.0 Up 05:22:44 - 05:44:44 4803
La Pine/Gilchrist 05:33:44 -35.2 Dark Down 45.0 280.6 Up 05:22:44 - 05:44:44 4801
Susanville 05:34:29 -37.8 Dark Down 43.6 284.3 Up 05:23:29 - 05:45:29 4788
Portola 05:34:33 -38.2 Dark Down 43.3 284.9 Up 05:23:33 - 05:45:33 4788
Fall River/Burney 05:33:44 -36.8 Dark Down 44.4 283.2 Up 05:22:44 - 05:44:44 4786
Wildwood 05:35:16 -42.9 Dark Down 40.0 290.5 Up 05:24:16 - 05:46:16 4778
Klamath Falls 05:33:44 -35.9 Dark Down 44.9 281.9 Up 05:22:44 - 05:44:44 4772
Gimple 05:34:31 -37.8 Dark Down 43.7 284.4 Up 05:23:31 - 05:45:31 4770
Greenville 05:34:31 -37.7 Dark Down 43.7 284.4 Up 05:23:31 - 05:45:31 4765
Quincy 05:34:32 -37.9 Dark Down 43.7 284.6 Up 05:23:32 - 05:45:32 4761
Victoria 05:33:26 -31.1 Dark Down 47.0 274.4 Up 05:22:26 - 05:44:26 4750
CPSLO 05:35:08 -40.8 Dark Down 42.0 288.9 Up 05:24:08 - 05:46:08 4675

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 248835, (2021/03/15 05:33UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 20.20  54
3Iot Aur       04:56:59.6 +33:09:58  2.7  2.98  63
PPM 069764     04:56:20.0 +36:10:07  6.0  1.82  64
PPM 069909     05:05:49.3 +35:50:46  7.6  0.26  65
PPM 069897     05:04:52.3 +35:30:03 10.0  0.15  65
248835         05:04:57.1 +35:38:57 15.9        65
Positions are for J2000

Event circumstances last updated at 2021/01/19 21:09:35 UT

Marc W. Buie, Southwest Research Institute

RECON