RECON: TNO occultation with 307261

Event between (307261) 02MS4 and star UC4-418-093843 with event index number of 204030

Geocentric closest approach at 2019/07/16 10:39:20 UTC

J2000 position of star is 18:44:47.8 -06:25:05
Equinox of date position of star is 18:45:45.5 -06:23:54
Stellar brightness R=16.5, use SENSEUP=128
Star is 18 degrees from the moon. Moon is 100% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 46.6 AU from the Sun and 45.6 AU from the Earth.
The TNO is moving 24.6 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 170 seconds.
The 1-sigma cross-track error in the shadow position is 1842 km.
The sky-plane scale is 33096.1 km/arcsec.

The TNO has an absolute magnitude Hv=3.6
Diameter=1148.2 km assuming a 5% albedo -- 46.6 sec chord
Diameter=468.7 km assuming a 30% albedo -- 19.0 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 

Star training set for 307261, (2019/07/16 10:39UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:36.5 -26:28:25  0.9 37.93  39
60Bet Oph      17:44:26.3 +04:33:38  2.8 18.84  36
PPM 202054     18:43:39.4 -07:03:12  6.5  0.85  18
PPM 202094     18:45:43.9 -06:30:53  6.8  0.12  18
PPM 202101     18:45:52.6 -06:19:09  9.1  0.08  18
307261         18:45:50.7 -06:23:48 16.5        18
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 21.9 km RECON observability=0.8 and success probability=17.8%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Oroville 10:36:39 -11.9 CT Up 18.2 236.1 Really Low 10:22:00 - 10:51:19 88
Tonasket 10:36:39 -12.1 AT Up 18.4 236.2 Really Low 10:21:59 - 10:51:18 71
Okanogan 10:36:38 -12.4 AT Up 18.6 236.1 Really Low 10:21:58 - 10:51:17 47
Brewster 10:36:38 -12.7 AT Up 18.9 236.0 Really Low 10:21:58 - 10:51:17 29
Manson/Chelan 10:36:38 -13.0 AT Up 19.2 235.8 Really Low 10:21:58 - 10:51:17 18
Entiat 10:36:37 -13.2 AT Up 19.4 235.8 Really Low 10:21:58 - 10:51:17 6
Wenatchee 10:36:37 -13.5 AT Up 19.6 235.8 Really Low 10:21:58 - 10:51:17 -17
Ellensburg 10:36:37 -13.9 AT Up 19.9 235.7 Really Low 10:21:57 - 10:51:16 -46
Yakima 10:36:36 -14.2 AT Up 20.2 235.8 Low 10:21:57 - 10:51:16 -77
Toppenish/White Swan 10:36:35 -14.3 AT Up 20.2 236.0 Low 10:21:56 - 10:51:15 -96
Pasco 10:36:33 -13.9 AT Up 19.6 237.1 Really Low 10:21:53 - 10:51:12 -122
Goldendale 10:36:35 -15.0 AT Up 20.8 235.8 Low 10:21:55 - 10:51:14 -134
PNWRO 10:36:32 -14.0 AT Up 19.6 237.4 Really Low 10:21:52 - 10:51:11 -144
George/Umatilla 10:36:32 -14.3 AT Up 19.9 237.0 Really Low 10:21:53 - 10:51:12 -145
The Dalles 10:36:35 -15.3 AT Up 21.1 235.6 Low 10:21:56 - 10:51:15 -147
Maupin 10:36:34 -15.6 AT Up 21.3 235.8 Low 10:21:54 - 10:51:13 -181
Madras/Culver 10:36:33 -16.1 AT Up 21.6 235.9 Low 10:21:54 - 10:51:13 -225
Sisters 10:36:33 -16.5 AT Up 22.1 235.7 Low 10:21:54 - 10:51:13 -245
Redmond 10:36:32 -16.4 AT Up 21.9 236.0 Low 10:21:53 - 10:51:12 -253
Bend 10:36:32 -16.6 AT Up 22.1 236.0 Low 10:21:53 - 10:51:12 -268
Oregon Observatory 10:36:32 -16.8 AT Up 22.2 235.9 Low 10:21:53 - 10:51:12 -280
La Pine/Gilchrist 10:36:32 -17.0 AT Up 22.4 235.9 Low 10:21:52 - 10:51:11 -296
North Lake 10:36:30 -17.1 AT Up 22.3 236.6 Low 10:21:50 - 10:51:09 -340
Chiloquin 10:36:30 -18.1 Dark Up 23.2 236.0 Low 10:21:51 - 10:51:10 -383
Paisley 10:36:28 -17.4 AT Up 22.4 237.1 Low 10:21:48 - 10:51:07 -390
Klamath Falls 10:36:30 -18.3 Dark Up 23.4 236.2 Low 10:21:50 - 10:51:09 -412
Lakeview 10:36:26 -17.7 AT Up 22.5 237.4 Low 10:21:47 - 10:51:06 -435
Tulelake 10:36:29 -18.4 Dark Up 23.3 236.5 Low 10:21:49 - 10:51:08 -439
Cedarville 10:36:25 -18.2 Dark Up 22.8 237.8 Low 10:21:46 - 10:51:05 -493
Fall River/Burney 10:36:26 -19.1 Dark Up 23.8 236.9 Low 10:21:47 - 10:51:06 -516
Susanville 10:36:24 -19.3 Dark Up 23.7 237.8 Low 10:21:44 - 10:51:03 -580
Greenville 10:36:24 -19.7 Dark Up 24.0 237.6 Low 10:21:44 - 10:51:03 -600
Gimple 10:36:24 -19.6 Dark Up 23.9 237.7 Low 10:21:44 - 10:51:03 -601
Quincy 10:36:24 -19.8 Dark Up 24.1 237.7 Low 10:21:44 - 10:51:03 -617
Portola 10:36:22 -19.7 Dark Up 23.9 238.1 Low 10:21:43 - 10:51:02 -635
Reno 10:36:21 -19.6 Dark Up 23.6 238.8 Low 10:21:41 - 10:51:00 -667
Carson City 10:36:20 -19.9 Dark Up 23.8 238.9 Low 10:21:40 - 10:50:59 -699
Gardnerville 10:36:19 -20.1 Dark Up 23.9 239.0 Low 10:21:40 - 10:50:59 -721
Yerington 10:36:18 -19.8 Dark Up 23.4 239.5 Low 10:21:39 - 10:50:58 -725
Hawthorne 10:36:16 -19.9 Dark Up 23.3 240.1 Low 10:21:37 - 10:50:56 -773
Lee Vining 10:36:16 -20.5 Dark Up 23.9 239.9 Low 10:21:37 - 10:50:56 -816
Niwot 10:35:57 -11.6 CT Up 13.3 249.6 Really Low 10:21:17 - 10:50:36 -819
Tonopah 10:36:12 -19.5 Dark Up 22.6 241.3 Low 10:21:33 - 10:50:52 -835
Bishop 10:36:14 -20.7 Dark Up 23.7 240.7 Low 10:21:34 - 10:50:53 -880
Beatty 10:36:09 -20.2 Dark Up 22.8 242.1 Low 10:21:30 - 10:50:49 -946
Lone Pine 10:36:12 -21.1 Dark Up 23.9 241.2 Low 10:21:32 - 10:50:51 -953
Indian Springs 10:36:07 -19.9 Dark Up 22.2 243.0 Low 10:21:28 - 10:50:47 -991
CPSLO 10:36:15 -23.4 Dark Up 26.3 239.8 Low 10:21:36 - 10:50:55 -1032
Henderson 10:36:04 -19.9 Dark Up 22.0 243.7 Low 10:21:25 - 10:50:44 -1050
Searchlight/Boulder City 10:36:04 -20.3 Dark Up 22.2 244.0 Low 10:21:24 - 10:50:43 -1104
Patrick 10:36:01 -19.8 Dark Up 21.4 244.8 Low 10:21:22 - 10:50:41 -1124
Laughlin/Bullhead City 10:36:02 -20.3 Dark Up 22.1 244.3 Low 10:21:23 - 10:50:42 -1136
Kingman/Dolan Springs 10:36:01 -20.0 Dark Up 21.7 244.7 Low 10:21:22 - 10:50:41 -1142
Mohave Valley 10:36:02 -20.5 Dark Up 22.2 244.4 Low 10:21:22 - 10:50:41 -1162
DCO 10:36:00 -19.6 Dark Up 21.0 245.4 Low 10:21:20 - 10:50:39 -1163
Wildwood 10:36:09 -23.3 Dark Up 25.5 241.8 Low 10:21:29 - 10:50:48 -1175
Lake Havasu City 10:36:01 -20.7 Dark Up 22.2 244.8 Low 10:21:21 - 10:50:40 -1203
Parker 10:36:00 -20.9 Dark Up 22.3 244.9 Low 10:21:21 - 10:50:40 -1236
Idyllwild 10:36:04 -22.6 Dark Up 24.3 243.4 Low 10:21:25 - 10:50:44 -1237
Blythe 10:36:00 -21.5 Dark Up 22.7 244.9 Low 10:21:20 - 10:50:39 -1280
Calipatria 10:36:01 -22.4 Dark Up 23.6 244.4 Low 10:21:21 - 10:50:40 -1313
Yuma 10:35:58 -22.2 Dark Up 23.2 245.2 Low 10:21:19 - 10:50:38 -1367

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 307261, (2019/07/16 10:39UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 37.93  39
60Bet Oph      17:43:28.3 +04:34:05  2.8 18.84  36
PPM 202054     18:42:36.1 -07:04:26  6.5  0.85  18
PPM 202094     18:44:40.9 -06:32:10  6.8  0.12  18
PPM 202101     18:44:49.7 -06:20:26  9.1  0.08  18
307261         18:44:47.8 -06:25:05 16.5        18
Positions are for J2000

Event circumstances last updated at 2017/12/06 19:08:17 UT

Marc W. Buie, Southwest Research Institute

RECON