RECON: TNO occultation with 99RX215

Event between 99RX215 and star GA0860:16976881 with event index number of 2439843

Geocentric closest approach at 2021/10/06 08:34:10 UTC

J2000 position of star is 23:33:36.7 -03:48:12
Equinox of date position of star is 23:34:43.5 -03:41:01
Stellar brightness G=16.2, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 160 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=23.8

[RECON map]
TNO is 43.6 AU from the Sun and 42.7 AU from the Earth.
The TNO is moving 23.1 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 374 seconds.
The 1-sigma cross-track error in the shadow position is 4955 km.
The sky-plane scale is 30961.7 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=195.9 km assuming a 5% albedo -- 8.5 sec chord
Diameter=80.0 km assuming a 30% albedo -- 3.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 

Star training set for 99RX215, (2021/10/06 08:34UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:58:50.9 -29:30:23  1.2 27.19 139
Markab         23:05:50.8 +15:19:22  2.5 20.31 150
PPM 207611     23:30:39.6 -04:24:51  6.3  1.25 159
PPM 207720     23:36:21.9 -03:43:59  7.6  0.41 161
PPM 207705     23:35:26.1 -03:51:52  9.5  0.25 160
99RX215        23:34:43.8 -03:40:59 16.2       161
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 2.4 sigma about the mid-time.
The median site spacing is 23.3 km RECON observability=1.0 and success probability=9.4%
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 08:31:22 -44.0 Dark Down 30.0 215.6 Low 08:16:22 - 08:46:22 1907
Victoria 08:31:31 -46.3 Dark Down 32.9 211.8 Up 08:16:31 - 08:46:31 1882
Kelowna 08:31:23 -44.4 Dark Down 30.3 215.6 Up 08:16:23 - 08:46:23 1880
Peachland 08:31:24 -44.5 Dark Down 30.5 215.3 Up 08:16:24 - 08:46:24 1880
Summerland 08:31:23 -44.7 Dark Down 30.6 215.4 Up 08:16:23 - 08:46:23 1866
Penticton 08:31:23 -44.7 Dark Down 30.6 215.6 Up 08:16:23 - 08:46:23 1858
Oliver 08:31:23 -45.0 Dark Down 30.9 215.7 Up 08:16:23 - 08:46:23 1830
Anarchist Mountain Observatory 08:31:22 -45.2 Dark Down 31.0 216.0 Up 08:16:22 - 08:46:22 1812
Tonasket 08:31:22 -45.5 Dark Down 31.3 216.0 Up 08:16:22 - 08:46:22 1788
Okanogan 08:31:22 -45.8 Dark Down 31.6 216.0 Up 08:16:22 - 08:46:22 1766
Brewster 08:31:22 -46.1 Dark Down 31.9 215.8 Up 08:16:22 - 08:46:22 1750
Manson/Chelan 08:31:24 -46.4 Dark Down 32.2 215.5 Up 08:16:24 - 08:46:24 1743
Wenatchee 08:31:24 -46.9 Dark Down 32.7 215.5 Up 08:16:24 - 08:46:24 1710
Ellensburg 08:31:24 -47.3 Dark Down 33.1 215.4 Up 08:16:24 - 08:46:24 1683
Yakima 08:31:24 -47.7 Dark Down 33.4 215.6 Up 08:16:24 - 08:46:24 1650
Toppenish/White Swan 08:31:24 -47.9 Dark Down 33.5 215.8 Up 08:16:24 - 08:46:24 1628
Goldendale 08:31:24 -48.5 Dark Down 34.2 215.6 Up 08:16:24 - 08:46:24 1595
The Dalles 08:31:25 -48.8 Dark Down 34.5 215.3 Up 08:16:25 - 08:46:25 1587
Pasco 08:31:19 -47.8 Dark Down 33.1 217.2 Up 08:16:19 - 08:46:19 1582
PNWRO 08:31:19 -48.0 Dark Down 33.2 217.6 Up 08:16:19 - 08:46:19 1555
Maupin 08:31:25 -49.2 Dark Down 34.8 215.6 Up 08:16:25 - 08:46:25 1549
Sisters 08:31:26 -50.1 Dark Down 35.7 215.4 Up 08:16:26 - 08:46:26 1491
Redmond 08:31:25 -50.1 Dark Down 35.6 215.8 Up 08:16:25 - 08:46:25 1477
Bend 08:31:25 -50.3 Dark Down 35.8 215.8 Up 08:16:25 - 08:46:25 1463
Oregon Observatory 08:31:26 -50.5 Dark Down 36.0 215.7 Up 08:16:26 - 08:46:26 1453
La Pine/Gilchrist 08:31:26 -50.7 Dark Down 36.2 215.7 Up 08:16:26 - 08:46:26 1438
North Lake 08:31:24 -51.0 Dark Down 36.3 216.6 Up 08:16:24 - 08:46:24 1383
Chiloquin 08:31:27 -51.8 Dark Down 37.2 215.8 Up 08:16:27 - 08:46:27 1354
Paisley 08:31:23 -51.5 Dark Down 36.6 217.2 Up 08:16:23 - 08:46:23 1325
Klamath Falls 08:31:26 -52.2 Dark Down 37.5 216.0 Up 08:16:26 - 08:46:26 1323
Lakeview 08:31:22 -51.9 Dark Down 36.9 217.6 Up 08:16:22 - 08:46:22 1276
Cedarville 08:31:21 -52.5 Dark Down 37.3 218.1 Up 08:16:21 - 08:46:21 1215
Fall River/Burney 08:31:25 -53.2 Dark Down 38.3 217.0 Up 08:16:25 - 08:46:25 1210
Susanville 08:31:23 -53.7 Dark Down 38.4 218.1 Up 08:16:23 - 08:46:23 1132
Greenville 08:31:24 -54.0 Dark Down 38.8 218.0 Up 08:16:24 - 08:46:24 1117
Gimple 08:31:24 -54.0 Dark Down 38.7 218.0 Up 08:16:24 - 08:46:24 1114
Quincy 08:31:24 -54.2 Dark Down 38.9 218.1 Up 08:16:24 - 08:46:24 1099
Portola 08:31:23 -54.2 Dark Down 38.8 218.7 Up 08:16:23 - 08:46:23 1073
Reno 08:31:21 -54.3 Dark Down 38.7 219.5 Up 08:16:21 - 08:46:21 1030
Carson City 08:31:21 -54.6 Dark Down 39.0 219.7 Up 08:16:21 - 08:46:21 997
Gardnerville 08:31:20 -54.9 Dark Down 39.1 219.9 Up 08:16:20 - 08:46:20 974
Yerington 08:31:19 -54.7 Dark Down 38.8 220.5 Up 08:16:19 - 08:46:19 960
Hawthorne 08:31:17 -54.9 Dark Down 38.9 221.3 Up 08:16:17 - 08:46:17 901
Lee Vining 08:31:18 -55.6 Dark Down 39.6 221.1 Up 08:16:18 - 08:46:18 866
Tonopah 08:31:13 -54.9 Dark Down 38.5 223.1 Up 08:16:13 - 08:46:13 815
Bishop 08:31:17 -55.9 Dark Down 39.6 222.2 Up 08:16:17 - 08:46:17 788
Beatty 08:31:11 -55.8 Dark Down 39.1 224.2 Up 08:16:11 - 08:46:11 694
CPSLO 08:31:24 -58.5 Dark Down 42.4 220.9 Up 08:16:24 - 08:46:24 673
Dunrhomin 08:30:42 -48.2 Dark Down 30.1 233.7 Up 08:15:42 - 08:45:42 665
Indian Springs 08:31:09 -55.8 Dark Down 38.7 225.5 Up 08:16:09 - 08:46:09 629
Henderson 08:31:06 -56.0 Dark Down 38.7 226.6 Up 08:16:06 - 08:46:06 557
Wildwood 08:31:17 -59.0 Dark Down 42.1 223.9 Up 08:16:17 - 08:46:17 492
Patrick 08:31:03 -56.1 Dark Down 38.4 228.1 Up 08:16:03 - 08:46:03 463
Laughlin/Bullhead City 08:31:05 -56.6 Dark Down 39.0 227.5 Up 08:16:05 - 08:46:05 462
Kingman/Dolan Springs 08:31:04 -56.3 Dark Down 38.7 228.0 Up 08:16:04 - 08:46:04 448
Mohave Valley 08:31:05 -56.8 Dark Down 39.2 227.7 Up 08:16:05 - 08:46:05 436
Idyllwild 08:31:12 -58.7 Dark Down 41.3 226.2 Up 08:16:12 - 08:46:12 396
Lake Havasu City 08:31:04 -57.0 Dark Down 39.3 228.2 Up 08:16:04 - 08:46:04 390
Parker 08:31:04 -57.3 Dark Down 39.5 228.4 Up 08:16:04 - 08:46:04 356
Blythe 08:31:05 -57.9 Dark Down 40.1 228.4 Up 08:16:05 - 08:46:05 315
Calipatria 08:31:08 -58.7 Dark Down 41.0 227.8 Up 08:16:08 - 08:46:08 299
George/Scottsdale 08:30:57 -56.6 Dark Down 38.3 231.1 Up 08:15:57 - 08:45:57 237
Yuma 08:31:05 -58.7 Dark Down 40.7 229.0 Up 08:16:05 - 08:46:05 228

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 99RX215, (2021/10/06 08:34UT)
Object            RA         Dec     mag  sep  mel
Fomalhaut      22:57:39.6 -29:37:24  1.2 27.19 139
Markab         23:04:45.8 +15:12:18  2.5 20.31 150
PPM 207611     23:29:32.4 -04:32:03  6.3  1.25 159
PPM 207720     23:35:14.7 -03:51:13  7.6  0.41 161
PPM 207705     23:34:19.0 -03:59:05  9.5  0.25 160
99RX215        23:33:36.7 -03:48:12 16.2       160
Positions are for J2000

Event circumstances last updated at 2021/08/30 01:16:10 UT

Marc W. Buie, Southwest Research Institute

RECON