RECON: TNO occultation with 609221

Event between (609221) 04VC131 and star GA1100:00742076 with event index number of 2789287

Geocentric closest approach at 2027/12/09 07:09:59 UTC

J2000 position of star is 04:44:43.6 +21:54:46
Equinox of date position of star is 04:46:03.1 +21:57:08
Stellar brightness G=16.0, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 51 degrees from the moon. Moon is 78% illuminated.
TNO apparent brightness V=22.3

[RECON map]
TNO is 41.0 AU from the Sun and 40.0 AU from the Earth.
The TNO is moving 25.3 km/sec on the sky relative to the star, or, 3.1 arcsec/hr.
The 1-sigma error in the time of the event is 184 seconds.
The 1-sigma cross-track error in the shadow position is 1646 km.
The sky-plane scale is 29031.3 km/arcsec.

The TNO has an absolute magnitude Hv=6.2
Diameter=351.6 km assuming a 5% albedo -- 13.9 sec chord
Diameter=143.5 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 609221, (2027/12/09 07:10UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:31.6 +16:33:48  0.8  5.79  49
Alnath         05:28:03.6 +28:37:43  1.6 11.53  61
PPM 093742     04:47:23.9 +23:40:38  6.1  1.73  51
PPM 093732     04:46:02.7 +21:42:26  8.4  0.27  51
PPM 093725     04:45:24.7 +21:51:51 11.1  0.25  51
609221         04:46:23.8 +21:57:45 16.0        52
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 4.9 sigma about the mid-time.
The median site spacing is 27.5 km RECON observability=1.0 and success probability=28.4%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Sleaford 07:09:22 -60.6 Dark Up 59.2 194.7 Up 06:54:22 - 07:24:22 2159
Kamloops 07:10:02 -60.9 Dark Up 60.8 168.1 Up 06:55:02 - 07:25:02 2143
Kelowna 07:10:00 -61.8 Dark Up 61.7 169.5 Up 06:55:00 - 07:25:00 2055
Peachland 07:10:01 -61.9 Dark Up 61.8 168.9 Up 06:55:01 - 07:25:01 2048
Summerland 07:10:01 -62.0 Dark Up 62.0 169.0 Up 06:55:01 - 07:25:01 2032
Penticton 07:10:01 -62.1 Dark Up 62.0 169.2 Up 06:55:01 - 07:25:01 2025
Oliver 07:10:01 -62.4 Dark Up 62.4 169.1 Up 06:55:01 - 07:25:01 1990
Victoria 07:10:12 -62.0 Dark Up 62.4 161.3 Up 06:55:12 - 07:25:12 1975
Anarchist Mountain Observatory 07:10:00 -62.6 Dark Up 62.6 169.4 Up 06:55:00 - 07:25:00 1972
Tonasket 07:10:01 -62.9 Dark Up 62.9 169.2 Up 06:55:01 - 07:25:01 1942
Okanogan 07:10:02 -63.2 Dark Up 63.2 168.7 Up 06:55:02 - 07:25:02 1911
Brewster 07:10:03 -63.4 Dark Up 63.4 168.2 Up 06:55:03 - 07:25:03 1887
Manson/Chelan 07:10:04 -63.5 Dark Up 63.6 167.4 Up 06:55:04 - 07:25:04 1871
Wenatchee 07:10:05 -63.9 Dark Up 64.0 166.8 Up 06:55:05 - 07:25:05 1827
Ellensburg 07:10:06 -64.2 Dark Up 64.4 166.2 Up 06:55:06 - 07:25:06 1789
Yakima 07:10:06 -64.6 Dark Up 64.8 165.9 Up 06:55:06 - 07:25:06 1749
Toppenish/White Swan 07:10:06 -64.8 Dark Up 65.0 166.2 Up 06:55:06 - 07:25:06 1725
Goldendale 07:10:08 -65.2 Dark Up 65.5 165.0 Up 06:55:08 - 07:25:08 1676
PNWRO 07:10:02 -65.6 Dark Up 65.6 169.3 Up 06:55:02 - 07:25:02 1670
The Dalles 07:10:09 -65.3 Dark Up 65.6 164.0 Up 06:55:09 - 07:25:09 1658
Maupin 07:10:09 -65.7 Dark Up 66.1 164.0 Up 06:55:09 - 07:25:09 1615
Sisters 07:10:11 -66.3 Dark Up 66.8 162.3 Up 06:55:11 - 07:25:11 1534
Bend 07:10:11 -66.6 Dark Up 67.1 162.8 Up 06:55:11 - 07:25:11 1506
Oregon Observatory 07:10:11 -66.7 Dark Up 67.2 162.3 Up 06:55:11 - 07:25:11 1491
North Lake 07:10:10 -67.5 Dark Up 67.9 163.2 Up 06:55:10 - 07:25:10 1418
Chiloquin 07:10:14 -67.7 Dark Up 68.4 160.3 Up 06:55:14 - 07:25:14 1363
Klamath Falls 07:10:14 -68.0 Dark Up 68.7 160.2 Up 06:55:14 - 07:25:14 1327
Lakeview 07:10:09 -68.6 Dark Up 69.1 163.7 Up 06:55:09 - 07:25:09 1303
Cedarville 07:10:09 -69.2 Dark Up 69.7 163.7 Up 06:55:09 - 07:25:09 1234
Fall River/Burney 07:10:13 -69.2 Dark Up 69.9 160.2 Up 06:55:13 - 07:25:13 1201
Susanville 07:10:12 -70.0 Dark Up 70.7 161.5 Up 06:55:12 - 07:25:12 1125
Greenville 07:10:13 -70.1 Dark Up 70.9 160.5 Up 06:55:13 - 07:25:13 1101
Gimple 07:10:12 -70.2 Dark Up 70.9 160.7 Up 06:55:12 - 07:25:12 1100
Quincy 07:10:13 -70.3 Dark Up 71.1 160.3 Up 06:55:13 - 07:25:13 1080
Portola 07:10:12 -70.6 Dark Up 71.3 161.5 Up 06:55:12 - 07:25:12 1060
Reno 07:10:10 -71.1 Dark Up 71.7 163.1 Up 06:55:10 - 07:25:10 1024
Carson City 07:10:10 -71.4 Dark Up 72.1 162.8 Up 06:55:10 - 07:25:10 986
Gardnerville 07:10:10 -71.6 Dark Up 72.3 162.7 Up 06:55:10 - 07:25:10 960
Yerington 07:10:08 -71.8 Dark Up 72.4 164.5 Up 06:55:08 - 07:25:08 957
Dunrhomin 07:09:21 -72.2 Dark Up 70.2 204.8 Up 06:54:21 - 07:24:21 954
CU-SBO 07:09:21 -72.5 Dark Up 70.5 204.8 Up 06:54:21 - 07:24:21 929
Hawthorne 07:10:06 -72.4 Dark Up 72.9 165.7 Up 06:55:06 - 07:25:06 901
Lee Vining 07:10:08 -72.7 Dark Up 73.4 163.7 Up 06:55:08 - 07:25:08 849
Tonopah 07:10:02 -73.4 Dark Up 73.6 169.8 Up 06:55:02 - 07:25:02 834
Bishop 07:10:06 -73.5 Dark Up 74.1 165.5 Up 06:55:06 - 07:25:06 776
Beatty 07:10:01 -74.6 Dark Up 74.8 170.6 Up 06:55:01 - 07:25:01 705
Indian Springs 07:09:58 -75.2 Dark Up 75.3 174.3 Up 06:54:58 - 07:24:58 657
Henderson 07:09:56 -75.9 Dark Up 75.9 176.7 Up 06:54:56 - 07:24:56 592
Patrick 07:09:52 -76.8 Dark Up 76.5 180.9 Up 06:54:52 - 07:24:52 512
Laughlin/Bullhead City 07:09:55 -76.8 Dark Up 76.7 178.1 Up 06:54:55 - 07:24:55 494
Kingman/Dolan Springs 07:09:53 -77.0 Dark Up 76.7 180.2 Up 06:54:53 - 07:24:53 490
Mohave Valley 07:09:55 -77.1 Dark Up 77.0 178.1 Up 06:54:55 - 07:24:55 465
Wildwood 07:10:10 -76.2 Dark Up 77.2 161.1 Up 06:55:10 - 07:25:10 431
Lake Havasu City 07:09:54 -77.6 Dark Up 77.4 179.1 Up 06:54:54 - 07:24:54 419
Parker 07:09:54 -77.9 Dark Up 77.8 179.2 Up 06:54:54 - 07:24:54 381
Idyllwild 07:10:03 -77.4 Dark Up 78.0 168.5 Up 06:55:03 - 07:25:03 367
George/Scottsdale 07:09:46 -78.9 Dark Up 78.0 190.0 Up 06:54:46 - 07:24:46 308
Calipatria 07:09:59 -78.4 Dark Up 78.7 173.3 Up 06:54:59 - 07:24:59 286
Yuma 07:09:56 -79.1 Dark Up 79.2 177.4 Up 06:54:56 - 07:24:56 228

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 609221, (2027/12/09 07:10UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:29  0.8  5.79  49
Alnath         05:26:17.6 +28:36:23  1.6 11.53  61
PPM 093742     04:45:42.5 +23:37:41  6.1  1.73  51
PPM 093732     04:44:22.7 +21:39:27  8.4  0.27  51
PPM 093725     04:43:44.6 +21:48:50 11.1  0.25  51
609221         04:44:43.6 +21:54:46 16.0        51
Positions are for J2000

Event circumstances last updated at 2022/03/03 02:39:50 UT

Marc W. Buie, Southwest Research Institute

RECON