RECON: TNO occultation with 308634

Event between (308634) 05XU100 and star UC4-494-054486 with event index number of 339256

Geocentric closest approach at 2020/02/29 07:37:06 UTC

J2000 position of star is 10:14:49.7 +08:44:48
Equinox of date position of star is 10:15:49.3 +08:39:10
Stellar brightness R=13.8, use SENSEUP=64
Star is 110 degrees from the moon. Moon is 27% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 43.1 AU from the Sun and 42.2 AU from the Earth.
The TNO is moving 25.4 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 212 seconds.
The 1-sigma cross-track error in the shadow position is 3548 km.
The sky-plane scale is 30576.0 km/arcsec.

The TNO has an absolute magnitude Hv=6.3
Diameter=331.1 km assuming a 5% albedo -- 13.0 sec chord
Diameter=135.2 km assuming a 30% albedo -- 5.3 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 308634, (2020/02/29 07:37UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:26.6 +11:52:04  1.3  3.59 108
31 Leo         10:08:58.4 +09:53:53  6.0  2.12 108
PPM 156653     10:16:01.5 +09:06:37  8.0  0.47 110
PPM 156641     10:15:32.0 +08:31:09  9.5  0.15 110
308634         10:15:53.5 +08:38:45 13.8       111
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 18.6 km RECON observability=1.0 and success probability=6.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 07:38:02 -47.3 Dark Down 48.8 180.0 Up 07:23:02 - 07:53:02 5688
Summerland 07:38:03 -47.3 Dark Down 48.9 179.5 Up 07:23:03 - 07:53:03 5676
Penticton 07:38:02 -47.7 Dark Down 49.2 179.7 Up 07:23:02 - 07:53:02 5655
Okanagan Falls 07:38:02 -47.8 Dark Down 49.4 179.7 Up 07:23:02 - 07:53:02 5640
Oliver 07:38:01 -48.0 Dark Down 49.6 179.7 Up 07:23:01 - 07:53:01 5627
Anarchist Mountain Observatory 07:38:01 -48.2 Dark Down 49.7 180.0 Up 07:23:01 - 07:53:01 5618
Oroville 07:38:01 -48.3 Dark Down 49.8 179.9 Up 07:23:01 - 07:53:01 5610
Tonasket 07:38:00 -48.5 Dark Down 50.0 179.9 Up 07:23:00 - 07:53:00 5592
Okanogan 07:38:01 -48.8 Dark Down 50.4 179.7 Up 07:23:01 - 07:53:01 5561
Brewster 07:38:01 -49.0 Dark Down 50.7 179.4 Up 07:23:01 - 07:53:01 5534
Manson/Chelan 07:38:01 -49.2 Dark Down 50.9 178.8 Up 07:23:01 - 07:53:01 5508
Entiat 07:38:01 -49.4 Dark Down 51.1 178.7 Up 07:23:01 - 07:53:01 5488
Wenatchee 07:38:02 -49.6 Dark Down 51.3 178.5 Up 07:23:02 - 07:53:02 5465
Ellensburg 07:38:02 -50.0 Dark Down 51.7 178.1 Up 07:23:02 - 07:53:02 5425
Pasco 07:37:57 -50.9 Dark Down 52.5 180.4 Up 07:22:57 - 07:52:57 5400
Yakima 07:38:02 -50.4 Dark Down 52.1 178.1 Up 07:23:02 - 07:53:02 5391
PNWRO 07:37:56 -51.2 Dark Down 52.7 180.8 Up 07:22:56 - 07:52:56 5385
Toppenish/White Swan 07:37:59 -50.6 Dark Down 52.4 178.4 Up 07:22:59 - 07:52:59 5377
George/Umatilla 07:37:56 -51.2 Dark Down 52.8 180.0 Up 07:22:56 - 07:52:56 5366
Goldendale 07:38:01 -51.1 Dark Down 52.9 177.6 Up 07:23:01 - 07:53:01 5320
The Dalles 07:38:02 -51.2 Dark Down 53.1 177.0 Up 07:23:02 - 07:53:02 5291
Niwot 07:37:07 -57.2 Dark Down 56.2 205.5 Up 07:22:07 - 07:52:07 5285
Maupin 07:38:02 -51.6 Dark Down 53.5 177.2 Up 07:23:02 - 07:53:02 5258
Madras/Culver 07:38:01 -52.2 Dark Down 54.1 177.1 Up 07:23:01 - 07:53:01 5211
Redmond 07:38:01 -52.5 Dark Down 54.4 177.0 Up 07:23:01 - 07:53:01 5179
Sisters 07:38:02 -52.4 Dark Down 54.4 176.3 Up 07:23:02 - 07:53:02 5170
Bend 07:38:01 -52.7 Dark Down 54.6 176.7 Up 07:23:01 - 07:53:01 5157
Oregon Observatory 07:38:01 -52.8 Dark Down 54.8 176.5 Up 07:23:01 - 07:53:01 5138
La Pine/Gilchrist 07:38:00 -53.0 Dark Down 55.0 176.3 Up 07:23:00 - 07:53:00 5119
North Lake 07:37:58 -53.5 Dark Down 55.5 177.3 Up 07:22:58 - 07:52:58 5097
Paisley 07:37:56 -54.1 Dark Down 56.0 177.9 Up 07:22:56 - 07:52:56 5059
Lakeview 07:37:56 -54.7 Dark Down 56.5 178.2 Up 07:22:56 - 07:52:56 5020
Chiloquin 07:38:01 -54.0 Dark Down 56.1 175.6 Up 07:23:01 - 07:53:01 5012
Klamath Falls 07:38:00 -54.3 Dark Down 56.5 175.7 Up 07:23:00 - 07:53:00 4984
Tulelake 07:37:58 -54.6 Dark Down 56.7 176.2 Up 07:22:58 - 07:52:58 4968
Cedarville 07:37:55 -55.3 Dark Down 57.2 178.5 Up 07:22:55 - 07:52:55 4967
Fall River/Burney 07:37:58 -55.5 Dark Down 57.7 176.3 Up 07:22:58 - 07:52:58 4890
Susanville 07:37:55 -56.3 Dark Down 58.3 177.6 Up 07:22:55 - 07:52:55 4854
Gimple 07:37:55 -56.5 Dark Down 58.6 177.1 Up 07:22:55 - 07:52:55 4823
Greenville 07:37:56 -56.5 Dark Down 58.6 177.0 Up 07:22:56 - 07:52:56 4821
Portola 07:37:54 -56.9 Dark Down 58.9 177.9 Up 07:22:54 - 07:52:54 4805
Quincy 07:37:55 -56.7 Dark Down 58.8 177.0 Up 07:22:55 - 07:52:55 4803
Reno 07:37:51 -57.3 Dark Down 59.2 179.1 Up 07:22:51 - 07:52:51 4800
Yerington 07:37:48 -58.0 Dark Down 59.8 180.3 Up 07:22:48 - 07:52:48 4769
Carson City 07:37:50 -57.7 Dark Down 59.6 179.1 Up 07:22:50 - 07:52:50 4768
Gardnerville 07:37:50 -57.9 Dark Down 59.8 179.2 Up 07:22:50 - 07:52:50 4747
Hawthorne 07:37:46 -58.5 Dark Down 60.2 181.4 Up 07:22:46 - 07:52:46 4742
Tonopah 07:37:41 -59.2 Dark Down 60.6 184.2 Up 07:22:41 - 07:52:41 4742
Lee Vining 07:37:46 -59.0 Dark Down 60.8 180.4 Up 07:22:46 - 07:52:46 4676
Indian Springs 07:37:34 -60.9 Dark Down 62.0 187.6 Up 07:22:34 - 07:52:34 4654
Beatty 07:37:38 -60.4 Dark Down 61.8 185.3 Up 07:22:38 - 07:52:38 4650
Bishop 07:37:44 -59.7 Dark Down 61.4 181.9 Up 07:22:44 - 07:52:44 4644
Henderson 07:37:30 -61.5 Dark Down 62.4 189.2 Up 07:22:30 - 07:52:30 4626
Patrick 07:37:26 -62.2 Dark Down 62.9 191.7 Up 07:22:26 - 07:52:26 4604
DCO 07:37:23 -62.6 Dark Down 63.1 193.4 Up 07:22:23 - 07:52:23 4598
Lone Pine 07:37:41 -60.5 Dark Down 62.1 182.6 Up 07:22:41 - 07:52:41 4584
Kingman/Dolan Springs 07:37:27 -62.4 Dark Down 63.1 191.4 Up 07:22:27 - 07:52:27 4578
Searchlight/Boulder City 07:37:30 -62.1 Dark Down 63.0 189.5 Up 07:22:30 - 07:52:30 4576
Laughlin/Bullhead City 07:37:28 -62.4 Dark Down 63.2 190.3 Up 07:22:28 - 07:52:28 4559
Mohave Valley 07:37:27 -62.7 Dark Down 63.5 190.4 Up 07:22:27 - 07:52:27 4535
Lake Havasu City 07:37:26 -63.1 Dark Down 63.9 191.1 Up 07:22:26 - 07:52:26 4505
Parker 07:37:25 -63.5 Dark Down 64.2 191.3 Up 07:22:25 - 07:52:25 4474
Blythe 07:37:26 -63.9 Dark Down 64.8 190.8 Up 07:22:26 - 07:52:26 4415
CPSLO 07:37:48 -61.2 Dark Down 63.4 177.1 Up 07:22:48 - 07:52:48 4385
Idyllwild 07:37:34 -63.5 Dark Down 64.9 186.0 Up 07:22:34 - 07:52:34 4359
Calipatria 07:37:29 -64.3 Dark Down 65.4 188.9 Up 07:22:29 - 07:52:29 4340
Wildwood 07:37:40 -62.8 Dark Down 64.6 181.6 Up 07:22:40 - 07:52:40 4333
Yuma 07:37:25 -64.9 Dark Down 65.7 191.1 Up 07:22:25 - 07:52:25 4328

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 308634, (2020/02/29 07:37UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:22.0 +11:58:02  1.3  3.59 108
31 Leo         10:07:54.2 +09:59:50  6.0  2.12 108
PPM 156653     10:14:57.5 +09:12:40  8.0  0.47 110
PPM 156641     10:14:28.2 +08:37:11  9.5  0.15 110
308634         10:14:49.7 +08:44:48 13.8       110
Positions are for J2000

Event circumstances last updated at 2018/10/26 20:47:18 UT

Marc W. Buie, Southwest Research Institute

RECON