RECON: TNO occultation with 99XY143

Event between 99XY143 and star GA1080:02480575 with event index number of 1026580

Geocentric closest approach at 2020/12/28 06:42:08 UTC

J2000 position of star is 06:53:22.5 +19:30:53
Equinox of date position of star is 06:54:29.8 +19:29:24
Stellar brightness G=15.2, use SENSEUP=128
Star is 27 degrees from the moon. Moon is 97% illuminated.
TNO apparent brightness V=22.6

[RECON map]
TNO is 44.9 AU from the Sun and 43.9 AU from the Earth.
The TNO is moving 25.8 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 169 seconds.
The 1-sigma cross-track error in the shadow position is 1805 km.
The sky-plane scale is 31873.5 km/arcsec.

The TNO has an absolute magnitude Hv=6.1
Diameter=358.1 km assuming a 5% albedo -- 13.9 sec chord
Diameter=146.2 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 99XY143, (2020/12/28 06:42UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:46:35.9 +27:58:26  1.1 14.60  38
Alhena         06:38:55.5 +16:22:47  1.9  4.86  24
PPM 123009     06:47:35.0 +18:48:50  6.5  1.79  26
PPM 123199     06:54:22.0 +19:25:01  8.4  0.09  27
99XY143        06:54:36.7 +19:29:15 15.2        27
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 22.9 km RECON observability=1.0 and success probability=0.5%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Kelowna 06:43:24 -59.5 Dark Up 53.8 138.2 Up 06:28:48 - 06:58:01 8270
Summerland 06:43:25 -59.4 Dark Up 53.7 137.6 Up 06:28:49 - 06:58:02 8268
Penticton 06:43:25 -59.7 Dark Up 54.0 137.6 Up 06:28:49 - 06:58:02 8236
Okanagan Falls 06:43:25 -59.9 Dark Up 54.2 137.4 Up 06:28:49 - 06:58:02 8218
Oliver 06:43:26 -60.0 Dark Up 54.3 137.3 Up 06:28:49 - 06:58:02 8202
Anarchist Mountain Observatory 06:43:26 -60.2 Dark Up 54.5 137.4 Up 06:28:49 - 06:58:02 8185
Oroville 06:43:25 -60.3 Dark Up 54.5 137.2 Up 06:28:49 - 06:58:02 8178
Tonasket 06:43:26 -60.5 Dark Up 54.7 137.0 Up 06:28:49 - 06:58:02 8155
Okanogan 06:43:26 -60.7 Dark Up 54.9 136.5 Up 06:28:49 - 06:58:02 8124
Brewster 06:43:27 -60.8 Dark Up 55.0 135.9 Up 06:28:50 - 06:58:03 8099
Manson/Chelan 06:43:29 -60.8 Dark Up 55.0 135.2 Up 06:28:52 - 06:58:05 8080
Entiat 06:43:28 -60.9 Dark Up 55.1 134.9 Up 06:28:52 - 06:58:05 8059
Wenatchee 06:43:29 -61.1 Dark Up 55.2 134.5 Up 06:28:53 - 06:58:06 8035
Ellensburg 06:43:30 -61.3 Dark Up 55.4 133.7 Up 06:28:54 - 06:58:07 7996
Yakima 06:43:31 -61.6 Dark Up 55.7 133.3 Up 06:28:54 - 06:58:07 7956
Toppenish/White Swan 06:43:31 -61.9 Dark Up 55.9 133.3 Up 06:28:54 - 06:58:07 7934
Pasco 06:43:27 -62.5 Dark Up 56.6 135.0 Up 06:28:51 - 06:58:04 7914
PNWRO 06:43:27 -62.8 Dark Up 56.9 135.0 Up 06:28:51 - 06:58:04 7888
George/Umatilla 06:43:28 -62.7 Dark Up 56.7 134.3 Up 06:28:52 - 06:58:05 7882
Goldendale 06:43:31 -62.1 Dark Up 56.1 132.1 Up 06:28:54 - 06:58:07 7882
The Dalles 06:43:31 -62.0 Dark Up 56.0 131.3 Up 06:28:54 - 06:58:07 7862
Maupin 06:43:31 -62.4 Dark Up 56.3 131.0 Up 06:28:54 - 06:58:07 7820
Madras/Culver 06:43:31 -62.8 Dark Up 56.7 130.3 Up 06:28:54 - 06:58:07 7766
Sisters 06:43:31 -62.8 Dark Up 56.6 129.3 Up 06:28:54 - 06:58:07 7736
Redmond 06:43:31 -63.0 Dark Up 56.9 129.8 Up 06:28:54 - 06:58:07 7731
Bend 06:43:31 -63.1 Dark Up 56.9 129.4 Up 06:28:54 - 06:58:07 7710
Oregon Observatory 06:43:31 -63.1 Dark Up 57.0 129.0 Up 06:28:54 - 06:58:07 7694
La Pine/Gilchrist 06:43:31 -63.2 Dark Up 57.1 128.7 Up 06:28:54 - 06:58:07 7674
North Lake 06:43:31 -63.8 Dark Up 57.7 129.0 Up 06:28:54 - 06:58:07 7625
Paisley 06:43:31 -64.4 Dark Up 58.2 128.8 Up 06:28:54 - 06:58:07 7567
Chiloquin 06:43:31 -63.8 Dark Up 57.5 126.8 Up 06:28:54 - 06:58:07 7566
Klamath Falls 06:43:31 -64.0 Dark Up 57.8 126.5 Up 06:28:54 - 06:58:07 7530
Lakeview 06:43:31 -64.9 Dark Up 58.7 128.4 Up 06:28:54 - 06:58:07 7514
Tulelake 06:43:31 -64.4 Dark Up 58.1 126.5 Up 06:28:54 - 06:58:07 7500
Cedarville 06:43:31 -65.4 Dark Up 59.2 127.8 Up 06:28:54 - 06:58:07 7446
Fall River/Burney 06:43:31 -65.0 Dark Up 58.7 125.5 Up 06:28:54 - 06:58:07 7407
Susanville 06:43:31 -65.9 Dark Up 59.5 125.6 Up 06:28:54 - 06:58:07 7336
Greenville 06:43:31 -65.9 Dark Up 59.5 124.8 Up 06:28:54 - 06:58:07 7310
Gimple 06:43:31 -65.9 Dark Up 59.6 125.0 Up 06:28:54 - 06:58:07 7309
Quincy 06:43:31 -66.0 Dark Up 59.6 124.6 Up 06:28:54 - 06:58:07 7289
Portola 06:43:31 -66.3 Dark Up 60.0 125.0 Up 06:28:54 - 06:58:07 7272
Niwot 06:42:50 -72.7 Dark Up 67.5 153.1 Up 06:28:14 - 06:57:27 7249
Reno 06:43:31 -66.9 Dark Up 60.6 125.6 Up 06:28:54 - 06:58:07 7239
Carson City 06:43:31 -67.1 Dark Up 60.8 125.1 Up 06:28:54 - 06:58:07 7201
Yerington 06:43:31 -67.6 Dark Up 61.3 125.7 Up 06:28:54 - 06:58:07 7176
Gardnerville 06:43:31 -67.3 Dark Up 61.0 124.8 Up 06:28:54 - 06:58:07 7176
Hawthorne 06:43:31 -68.3 Dark Up 61.9 125.8 Up 06:28:54 - 06:58:07 7124
Lee Vining 06:43:31 -68.3 Dark Up 61.9 124.2 Up 06:28:54 - 06:58:07 7068
Tonopah 06:43:29 -69.4 Dark Up 63.1 127.2 Up 06:28:53 - 06:58:06 7066
Bishop 06:43:31 -69.1 Dark Up 62.7 124.3 Up 06:28:54 - 06:58:07 7000
Beatty 06:43:29 -70.4 Dark Up 64.1 126.1 Up 06:28:53 - 06:58:06 6941
Lone Pine 06:43:31 -69.8 Dark Up 63.4 123.6 Up 06:28:54 - 06:58:07 6918
Indian Springs 06:43:26 -71.3 Dark Up 64.9 127.2 Up 06:28:49 - 06:58:02 6901
Henderson 06:43:23 -72.1 Dark Up 65.7 127.4 Up 06:28:47 - 06:58:00 6841
CPSLO 06:43:31 -68.7 Dark Up 62.2 117.8 Up 06:28:54 - 06:58:07 6804
Searchlight/Boulder City 06:43:24 -72.5 Dark Up 66.1 126.5 Up 06:28:47 - 06:58:00 6780
Patrick 06:43:20 -73.2 Dark Up 66.8 128.2 Up 06:28:44 - 06:57:57 6769
Kingman/Dolan Springs 06:43:21 -73.2 Dark Up 66.8 127.5 Up 06:28:45 - 06:57:58 6746
Laughlin/Bullhead City 06:43:22 -72.9 Dark Up 66.5 126.5 Up 06:28:46 - 06:57:59 6746
DCO 06:43:18 -73.8 Dark Up 67.4 128.9 Up 06:28:41 - 06:57:54 6734
Mohave Valley 06:43:22 -73.1 Dark Up 66.7 126.1 Up 06:28:46 - 06:57:59 6717
Lake Havasu City 06:43:22 -73.5 Dark Up 67.1 125.7 Up 06:28:45 - 06:57:58 6673
Wildwood 06:43:31 -70.8 Dark Up 64.3 118.4 Up 06:28:54 - 06:58:07 6656
Parker 06:43:22 -73.7 Dark Up 67.3 125.1 Up 06:28:46 - 06:57:59 6635
Idyllwild 06:43:30 -72.3 Dark Up 65.8 120.5 Up 06:28:54 - 06:58:07 6604
Blythe 06:43:23 -73.8 Dark Up 67.4 123.5 Up 06:28:47 - 06:58:00 6580
Calipatria 06:43:27 -73.5 Dark Up 67.0 121.1 Up 06:28:51 - 06:58:04 6532
Yuma 06:43:24 -74.3 Dark Up 67.9 121.6 Up 06:28:47 - 06:58:00 6481

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 99XY143, (2020/12/28 06:42UT)
Object            RA         Dec     mag  sep  mel
Pollux         07:45:18.0 +28:01:33  1.1 14.60  38
Alhena         06:37:42.8 +16:23:57  1.9  4.86  24
PPM 123009     06:46:21.1 +18:50:16  6.5  1.79  26
PPM 123199     06:53:07.8 +19:26:39  8.4  0.09  27
99XY143        06:53:22.5 +19:30:53 15.2        27
Positions are for J2000

Event circumstances last updated at 2019/01/18 20:02:38 UT

Marc W. Buie, Southwest Research Institute

RECON