RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star GA0840:13592111 with event index number of 1148541

Geocentric closest approach at 2021/06/29 04:06:46 UTC

J2000 position of star is 18:54:36.5 -05:56:17
Equinox of date position of star is 18:55:44.1 -05:54:36
Stellar brightness G=15.4, 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 76% illuminated.
TNO apparent brightness V=20.4

[RECON map]
TNO is 46.4 AU from the Sun and 45.5 AU from the Earth.
The TNO is moving 25.0 km/sec on the sky relative to the star, or, 2.7 arcsec/hr.
The 1-sigma error in the time of the event is 213 seconds.
The 1-sigma cross-track error in the shadow position is 2157 km.
The sky-plane scale is 32974.9 km/arcsec.

The TNO has an absolute magnitude Hv=3.7
Diameter=1081.5 km assuming a 5% albedo -- 43.2 sec chord
Diameter=441.5 km assuming a 30% albedo -- 17.6 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2021/06/29 04:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:43.7 -26:28:40  0.9 40.19  86
Nunki          18:56:35.8 -26:16:05  2.0 20.36  53
Eta Sct        18:58:12.7 -05:49:00  4.8  0.62  55
PPM 202291     18:55:37.0 -05:55:45  7.8  0.04  55
307261         18:55:45.5 -05:54:34 15.4        55
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 4.2 sigma about the mid-time.
The median site spacing is 0.0 km RECON observability=0.0 and success probability=0.0%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Clarence Fulton 04:09:04 -0.5 Sun up Down 11.9 114.8 Really Low 03:54:04 - 04:24:04 11162
Kelowna 04:09:06 -0.7 Sun up Down 12.0 114.6 Really Low 03:54:06 - 04:24:06 11136
Peachland 04:09:06 -0.6 Sun up Down 11.9 114.4 Really Low 03:54:06 - 04:24:06 11127
Summerland 04:09:07 -0.8 Sun up Down 12.0 114.4 Really Low 03:54:07 - 04:24:07 11118
Penticton 04:09:06 -0.9 CT Down 12.1 114.5 Really Low 03:54:06 - 04:24:06 11114
Oliver 04:09:09 -1.1 CT Down 12.3 114.4 Really Low 03:54:09 - 04:24:09 11091
Anarchist Mountain Observatory 04:09:08 -1.3 CT Down 12.4 114.5 Really Low 03:54:08 - 04:24:08 11082
Tonasket 04:09:09 -1.4 CT Down 12.5 114.4 Really Low 03:54:09 - 04:24:09 11060
Okanogan 04:09:10 -1.6 CT Down 12.6 114.2 Really Low 03:54:10 - 04:24:10 11037
Victoria 04:09:15 0.5 Sun up Down 10.2 111.2 Really Low 03:54:15 - 04:24:15 11026
Brewster 04:09:11 -1.6 CT Down 12.6 114.0 Really Low 03:54:11 - 04:24:11 11018
Manson/Chelan 04:09:12 -1.6 CT Down 12.4 113.7 Really Low 03:54:12 - 04:24:12 11002
Wenatchee 04:09:14 -1.8 CT Down 12.5 113.5 Really Low 03:54:14 - 04:24:14 10969
Ellensburg 04:09:16 -1.9 CT Down 12.6 113.2 Really Low 03:54:16 - 04:24:16 10940
Yakima 04:09:17 -2.2 CT Down 12.7 113.1 Really Low 03:54:17 - 04:24:17 10911
Toppenish/White Swan 04:09:16 -2.4 CT Down 12.9 113.2 Really Low 03:54:16 - 04:24:16 10897
Pasco 04:09:16 -3.2 CT Down 13.7 114.2 Really Low 03:54:16 - 04:24:16 10896
PNWRO 04:09:17 -3.4 CT Down 14.0 114.3 Really Low 03:54:17 - 04:24:17 10880
Goldendale 04:09:20 -2.5 CT Down 12.8 112.8 Really Low 03:54:20 - 04:24:20 10856
The Dalles 04:09:21 -2.4 CT Down 12.7 112.4 Really Low 03:54:21 - 04:24:21 10838
Maupin 04:09:22 -2.8 CT Down 12.9 112.4 Really Low 03:54:22 - 04:24:22 10809
Redmond 04:09:25 -3.3 CT Down 13.2 112.2 Really Low 03:54:25 - 04:24:25 10743
Sisters 04:09:25 -3.0 CT Down 12.9 111.9 Really Low 03:54:25 - 04:24:25 10743
Bend 04:09:25 -3.3 CT Down 13.2 112.0 Really Low 03:54:25 - 04:24:25 10727
Oregon Observatory 04:09:26 -3.4 CT Down 13.2 111.9 Really Low 03:54:26 - 04:24:26 10714
La Pine/Gilchrist 04:09:27 -3.4 CT Down 13.2 111.8 Really Low 03:54:27 - 04:24:27 10698
North Lake 04:09:27 -4.1 CT Down 13.8 112.2 Really Low 03:54:27 - 04:24:27 10670
Paisley 04:09:29 -4.6 CT Down 14.3 112.3 Really Low 03:54:29 - 04:24:29 10631
Lakeview 04:09:30 -5.0 CT Down 14.6 112.3 Really Low 03:54:30 - 04:24:30 10594
Klamath Falls 04:09:30 -4.2 CT Down 13.6 111.3 Really Low 03:54:30 - 04:24:30 10588
Cedarville 04:09:30 -5.5 CT Down 15.0 112.3 Really Low 03:54:30 - 04:24:30 10545
Dunrhomin 04:09:07 -14.6 AT Down 25.5 123.6 Low 03:54:07 - 04:24:07 10527
Fall River/Burney 04:09:30 -5.1 CT Down 14.3 111.3 Really Low 03:54:30 - 04:24:30 10500
Susanville 04:09:31 -5.9 CT Down 15.0 111.7 Really Low 03:54:31 - 04:24:31 10456
Gimple 04:09:31 -6.0 CT Down 15.0 111.5 Really Low 03:54:31 - 04:24:31 10433
Greenville 04:09:31 -5.9 CT Down 14.9 111.4 Really Low 03:54:31 - 04:24:31 10433
Quincy 04:09:31 -6.0 NT Down 15.0 111.4 Really Low 03:54:31 - 04:24:31 10417
Portola 04:09:31 -6.4 NT Down 15.4 111.7 Really Low 03:54:31 - 04:24:31 10410
Reno 04:09:31 -7.0 NT Down 16.0 112.1 Really Low 03:54:31 - 04:24:31 10393
Carson City 04:09:31 -7.2 NT Down 16.1 112.0 Really Low 03:54:31 - 04:24:31 10365
Yerington 04:09:31 -7.7 NT Down 16.6 112.4 Really Low 03:54:31 - 04:24:31 10354
Gardnerville 04:09:31 -7.4 NT Down 16.2 111.9 Really Low 03:54:31 - 04:24:31 10346
Hawthorne 04:09:31 -8.3 NT Down 17.2 112.6 Really Low 03:54:31 - 04:24:31 10320
Tonopah 04:09:31 -9.5 NT Down 18.4 113.5 Really Low 03:54:31 - 04:24:31 10291
Lee Vining 04:09:31 -8.4 NT Down 17.1 112.1 Really Low 03:54:31 - 04:24:31 10272
Bishop 04:09:31 -9.2 NT Down 17.8 112.5 Really Low 03:54:31 - 04:24:31 10228
Beatty 04:09:31 -10.5 NT Down 19.2 113.5 Really Low 03:54:31 - 04:24:31 10199
Indian Springs 04:09:31 -11.4 NT Down 20.1 114.1 Low 03:54:31 - 04:24:31 10178
Henderson 04:09:31 -12.2 AT Down 20.9 114.5 Low 03:54:31 - 04:24:31 10138
Patrick 04:09:31 -13.2 AT Down 21.9 115.0 Low 03:54:31 - 04:24:31 10092
Kingman/Dolan Springs 04:09:31 -13.3 AT Down 21.9 114.8 Low 03:54:31 - 04:24:31 10073
Laughlin/Bullhead City 04:09:31 -13.0 AT Down 21.5 114.4 Low 03:54:31 - 04:24:31 10067
CPSLO 04:09:31 -9.0 NT Down 16.9 110.3 Really Low 03:54:31 - 04:24:31 10048
Mohave Valley 04:09:31 -13.2 AT Down 21.6 114.3 Low 03:54:31 - 04:24:31 10045
Lake Havasu City 04:09:31 -13.6 AT Down 22.0 114.4 Low 03:54:31 - 04:24:31 10012
Parker 04:09:31 -13.8 AT Down 22.1 114.3 Low 03:54:31 - 04:24:31 9983
George/Scottsdale 04:09:31 -15.6 AT Down 24.2 115.8 Low 03:54:31 - 04:24:31 9959
Wildwood 04:09:31 -11.1 NT Down 18.9 111.3 Really Low 03:54:31 - 04:24:31 9958
Idyllwild 04:09:31 -12.6 AT Down 20.5 112.5 Low 03:54:31 - 04:24:31 9938
Blythe 04:09:31 -14.0 AT Down 22.1 113.9 Low 03:54:31 - 04:24:31 9937
Calipatria 04:09:31 -13.7 AT Down 21.6 113.0 Low 03:54:31 - 04:24:31 9891
Yuma 04:09:31 -14.6 AT Down 22.5 113.5 Low 03:54:31 - 04:24:31 9858

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 307261, (2021/06/29 04:07UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 40.19  86
Nunki          18:55:15.9 -26:17:49  2.0 20.36  53
Eta Sct        18:57:03.8 -05:50:48  4.8  0.62  55
PPM 202291     18:54:28.0 -05:57:27  7.8  0.04  55
307261         18:54:36.5 -05:56:17 15.4        55
Positions are for J2000

Event circumstances last updated at 2021/01/23 20:06:54 UT

Marc W. Buie, Southwest Research Institute

RECON