RECON: TNO occultation with 8405

Event between (8405) Asbolus and star GA1300:02924099 with event index number of 1146990

Geocentric closest approach at 2021/12/31 14:02:40 UTC

J2000 position of star is 05:34:55.6 +41:23:43
Equinox of date position of star is 05:36:28.7 +41:24:29
Stellar brightness G=15.1, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 157 degrees from the moon. Moon is 7% illuminated.
TNO apparent brightness V=22.9

[RECON map]
TNO is 23.9 AU from the Sun and 23.0 AU from the Earth.
The TNO is moving 25.2 km/sec on the sky relative to the star, or, 5.4 arcsec/hr.
The 1-sigma error in the time of the event is 96 seconds.
The 1-sigma cross-track error in the shadow position is 1026 km.
The sky-plane scale is 16666.9 km/arcsec.

The TNO has an absolute magnitude Hv=9.1
Diameter=91.2 km assuming a 5% albedo -- 3.6 sec chord
Diameter=37.2 km assuming a 30% albedo -- 1.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 8405, (2021/12/31 14:03UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:11.1 +16:33:06  0.8 27.94 174
34Bet Aur      06:01:08.6 +44:56:50  1.9  5.72 151
PPM 048217     05:35:02.7 +42:07:21  6.2  0.76 156
PPM 048232     05:35:50.2 +41:08:12  8.5  0.30 157
PPM 048259     05:37:16.3 +41:19:09  8.7  0.17 157
8405           05:36:29.0 +41:24:30 15.1       157
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 17.8 km RECON observability=0.2 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)
Sleaford 13:59:58 -10.3 NT Up 16.7 317.6 Really Low 13:51:28 - 14:08:27 9461
Dunrhomin 13:59:28 -4.8 CT Up 7.5 319.7 Really Low 13:50:58 - 14:07:57 9026
Kelowna 13:59:40 -17.6 AT Up 21.4 309.6 Low 13:51:10 - 14:08:09 8748
Kamloops 13:59:41 -18.4 Dark Up 22.3 308.8 Low 13:51:12 - 14:08:11 8745
Peachland 13:59:38 -17.8 AT Up 21.5 309.4 Low 13:51:09 - 14:08:08 8729
Penticton 13:59:38 -17.6 AT Up 21.2 309.6 Low 13:51:09 - 14:08:08 8728
Summerland 13:59:39 -17.7 AT Up 21.3 309.5 Low 13:51:09 - 14:08:08 8726
Anarchist Mountain Observatory 13:59:37 -17.3 AT Up 20.8 309.9 Low 13:51:07 - 14:08:06 8712
Oliver 13:59:37 -17.5 AT Up 21.0 309.7 Low 13:51:08 - 14:08:07 8711
Tonasket 13:59:36 -17.3 AT Up 20.6 309.9 Low 13:51:06 - 14:08:05 8693
Okanogan 13:59:34 -17.3 AT Up 20.5 309.9 Low 13:51:05 - 14:08:04 8668
Brewster 13:59:33 -17.4 AT Up 20.4 309.9 Low 13:51:03 - 14:08:02 8645
Manson/Chelan 13:59:33 -17.6 AT Up 20.5 309.7 Low 13:51:03 - 14:08:02 8616
Pasco 13:59:28 -16.4 AT Up 18.9 310.8 Really Low 13:50:59 - 14:07:58 8583
Wenatchee 13:59:31 -17.5 AT Up 20.3 309.8 Low 13:51:02 - 14:08:01 8582
PNWRO 13:59:27 -16.2 AT Up 18.6 311.0 Really Low 13:50:58 - 14:07:57 8582
Ellensburg 13:59:30 -17.6 AT Up 20.1 309.8 Low 13:51:01 - 14:08:00 8549
Yakima 13:59:29 -17.5 AT Up 19.9 309.9 Really Low 13:50:59 - 14:07:58 8527
Toppenish/White Swan 13:59:28 -17.3 AT Up 19.7 310.0 Really Low 13:50:59 - 14:07:58 8524
Victoria 13:59:33 -19.8 Dark Up 22.6 307.6 Low 13:51:03 - 14:08:02 8487
Goldendale 13:59:26 -17.5 AT Up 19.5 309.9 Really Low 13:50:57 - 14:07:56 8472
The Dalles 13:59:26 -17.7 AT Up 19.6 309.8 Really Low 13:50:56 - 14:07:55 8441
Maupin 13:59:25 -17.5 AT Up 19.3 309.9 Really Low 13:50:55 - 14:07:54 8423
Redmond 13:59:22 -17.3 AT Up 18.7 310.1 Really Low 13:50:52 - 14:07:51 8368
Bend 13:59:22 -17.4 AT Up 18.7 310.1 Really Low 13:50:52 - 14:07:51 8348
Sisters 13:59:22 -17.6 AT Up 19.0 309.9 Really Low 13:50:52 - 14:07:51 8348
Oregon Observatory 13:59:20 -17.4 AT Up 18.6 310.1 Really Low 13:50:51 - 14:07:50 8331
North Lake 13:59:19 -16.8 AT Up 17.9 310.5 Really Low 13:50:50 - 14:07:49 8324
La Pine/Gilchrist 13:59:20 -17.4 AT Up 18.5 310.1 Really Low 13:50:51 - 14:07:50 8316
Paisley 13:59:18 -16.4 AT Up 17.4 310.8 Really Low 13:50:48 - 14:07:47 8312
Lakeview 13:59:17 -16.2 AT Up 16.9 311.1 Really Low 13:50:47 - 14:07:46 8293
George/Scottsdale 13:59:05 -7.0 NT Up 6.3 316.6 Really Low 13:50:35 - 14:07:34 8289
Patrick 13:59:06 -9.2 NT Up 8.6 315.5 Really Low 13:50:37 - 14:07:36 8269
Cedarville 13:59:16 -15.9 AT Up 16.4 311.3 Really Low 13:50:46 - 14:07:45 8265
Kingman/Dolan Springs 13:59:05 -9.3 NT Up 8.6 315.4 Really Low 13:50:35 - 14:07:34 8244
Henderson 13:59:06 -10.3 NT Up 9.7 314.8 Really Low 13:50:36 - 14:07:35 8240
Chiloquin 13:59:17 -17.3 AT Up 18.0 310.2 Really Low 13:50:48 - 14:07:47 8232
Indian Springs 13:59:06 -11.0 NT Up 10.5 314.4 Really Low 13:50:37 - 14:07:36 8230
Tonopah 13:59:09 -12.6 AT Up 12.4 313.4 Really Low 13:50:39 - 14:07:38 8229
Klamath Falls 13:59:16 -17.2 AT Up 17.8 310.3 Really Low 13:50:47 - 14:07:46 8216
Laughlin/Bullhead City 13:59:05 -9.6 NT Up 8.9 315.1 Really Low 13:50:35 - 14:07:34 8211
Mohave Valley 13:59:04 -9.5 NT Up 8.7 315.2 Really Low 13:50:35 - 14:07:34 8195
Beatty 13:59:07 -11.9 NT Up 11.3 313.8 Really Low 13:50:37 - 14:07:36 8186
Lake Havasu City 13:59:05 -9.2 NT Up 8.2 315.3 Really Low 13:50:35 - 14:07:34 8186
Hawthorne 13:59:09 -13.8 AT Up 13.5 312.7 Really Low 13:50:39 - 14:07:38 8174
Susanville 13:59:12 -15.9 AT Up 16.0 311.3 Really Low 13:50:43 - 14:07:42 8172
Yerington 13:59:09 -14.4 AT Up 14.2 312.3 Really Low 13:50:39 - 14:07:38 8172
Fall River/Burney 13:59:13 -16.6 AT Up 16.8 310.8 Really Low 13:50:44 - 14:07:43 8167
Reno 13:59:11 -15.0 AT Up 14.9 311.9 Really Low 13:50:41 - 14:07:40 8167
Parker 13:59:03 -9.1 NT Up 8.0 315.4 Really Low 13:50:34 - 14:07:33 8166
Carson City 13:59:10 -14.9 AT Up 14.6 312.0 Really Low 13:50:40 - 14:07:39 8147
Portola 13:59:11 -15.6 AT Up 15.4 311.5 Really Low 13:50:41 - 14:07:40 8146
Gimple 13:59:11 -16.0 AT Up 15.9 311.2 Really Low 13:50:42 - 14:07:41 8143
Greenville 13:59:11 -16.0 AT Up 15.9 311.2 Really Low 13:50:41 - 14:07:40 8138
Gardnerville 13:59:09 -14.8 AT Up 14.5 312.0 Really Low 13:50:40 - 14:07:39 8135
Quincy 13:59:11 -16.0 AT Up 15.8 311.2 Really Low 13:50:41 - 14:07:40 8126
Bishop 13:59:06 -13.3 AT Up 12.6 313.0 Really Low 13:50:37 - 14:07:36 8117
Blythe 13:59:02 -9.1 NT Up 7.8 315.3 Really Low 13:50:32 - 14:07:31 8115
Lee Vining 13:59:08 -14.0 AT Up 13.4 312.5 Really Low 13:50:38 - 14:07:37 8112
Yuma 13:59:00 -8.8 NT Up 7.2 315.3 Really Low 13:50:31 - 14:07:30 8055
Calipatria 13:59:00 -9.6 NT Up 8.0 314.9 Really Low 13:50:30 - 14:07:29 8027
Idyllwild 13:59:00 -10.8 NT Up 9.1 314.3 Really Low 13:50:31 - 14:07:30 7993
Wildwood 13:58:59 -12.4 AT Up 10.5 313.4 Really Low 13:50:29 - 14:07:28 7899
CPSLO 13:59:00 -14.4 AT Up 12.6 312.2 Really Low 13:50:31 - 14:07:30 7851

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 8405, (2021/12/31 14:03UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8 27.94 174
34Bet Aur      05:59:31.6 +44:56:51  1.9  5.72 151
PPM 048217     05:33:28.7 +42:06:32  6.2  0.76 156
PPM 048232     05:34:17.0 +41:07:24  8.5  0.30 157
PPM 048259     05:35:42.9 +41:18:23  8.7  0.17 157
8405           05:34:55.6 +41:23:43 15.1       157
Positions are for J2000

Event circumstances last updated at 2021/12/07 01:44:38 UT

Marc W. Buie, Southwest Research Institute

RECON