RECON: TNO occultation with 55638

Event between (55638) 02VE95 and star UC4-489-015235 with event index number of 101229

Geocentric closest approach at 2018/01/16 08:44:16 UTC

J2000 position of star is 05:53:20.6 +07:38:07
Equinox of date position of star is 05:54:19.0 +07:38:16
Stellar brightness R=15.1, use SENSEUP=128
Star is 156 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=20.3

[RECON map]
TNO is 29.8 AU from the Sun and 28.9 AU from the Earth.
The TNO is moving 21.1 km/sec on the sky relative to the star, or, 3.6 arcsec/hr.
The 1-sigma error in the time of the event is 105 seconds.
The 1-sigma cross-track error in the shadow position is 1064 km.
The sky-plane scale is 20982.3 km/arcsec.

The TNO has an absolute magnitude Hv=5.5
Diameter=478.6 km assuming a 5% albedo -- 22.6 sec chord
Diameter=195.4 km assuming a 30% albedo -- 9.2 sec chord
Dynamical classification is 3:2E
 
 
 
 
 
 

Star training set for 55638, (2018/01/16 08:44UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:56:08.9 +07:24:32  0.4  0.51 156
Bellatrix      05:26:06.0 +06:21:53  1.6  7.12 150
52 Ori         05:48:58.4 +06:27:33  5.5  1.78 154
PPM 149627     05:55:27.6 +08:03:23  7.2  0.50 157
PPM 149617     05:55:02.3 +07:42:56  9.5  0.19 156
PPM 149610     05:54:38.2 +07:34:45 10.7  0.10 156
55638          05:54:19.4 +07:38:16 15.1       156
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 17.6 km RECON observability=1.0 and success probability=0.0%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Oroville	08:42:40	-61.1	Dark	Down	37.5	231.3	Up	08:33:25 - 08:51:56	10113
Tonasket	08:42:40	-61.3	Dark	Down	37.6	231.4	Up	08:33:25 - 08:51:56	10096
Okanogan	08:42:39	-61.7	Dark	Down	37.9	231.4	Up	08:33:24 - 08:51:55	10069
Brewster	08:42:39	-62.0	Dark	Down	38.2	231.4	Up	08:33:24 - 08:51:55	10046
Manson/Chelan	08:42:39	-62.3	Dark	Down	38.5	231.1	Up	08:33:24 - 08:51:55	10025
Entiat	08:42:39	-62.5	Dark	Down	38.7	231.2	Up	08:33:24 - 08:51:55	10008
Wenatchee	08:42:38	-62.7	Dark	Down	38.9	231.2	Up	08:33:22 - 08:51:53	9987
Ellensburg	08:42:38	-63.2	Dark	Down	39.3	231.3	Up	08:33:22 - 08:51:53	9953
Yakima	08:42:37	-63.6	Dark	Down	39.6	231.5	Up	08:33:21 - 08:51:52	9921
Pasco	08:42:32	-63.6	Dark	Down	39.0	233.2	Up	08:33:17 - 08:51:48	9916
Toppenish/White Swan	08:42:35	-63.8	Dark	Down	39.6	231.8	Up	08:33:20 - 08:51:51	9907
PNWRO	08:42:31	-63.8	Dark	Down	39.0	233.6	Up	08:33:15 - 08:51:46	9901
George/Umatilla	08:42:31	-64.0	Dark	Down	39.3	233.2	Up	08:33:16 - 08:51:47	9887
Goldendale	08:42:35	-64.4	Dark	Down	40.2	231.7	Up	08:33:20 - 08:51:51	9858
The Dalles	08:42:35	-64.7	Dark	Down	40.5	231.5	Up	08:33:20 - 08:51:51	9835
Maupin	08:42:34	-65.0	Dark	Down	40.7	231.9	Up	08:33:18 - 08:51:49	9804
Madras/Culver	08:42:34	-65.6	Dark	Down	41.1	232.2	Up	08:33:18 - 08:51:49	9760
Redmond	08:42:32	-65.9	Dark	Down	41.3	232.4	Up	08:33:16 - 08:51:47	9731
Sisters	08:42:33	-66.0	Dark	Down	41.6	231.9	Up	08:33:17 - 08:51:48	9727
Bend	08:42:32	-66.2	Dark	Down	41.6	232.4	Up	08:33:16 - 08:51:47	9711
Oregon Observatory	08:42:31	-66.4	Dark	Down	41.7	232.3	Up	08:33:16 - 08:51:47	9695
La Pine/Gilchrist	08:42:32	-66.6	Dark	Down	41.9	232.4	Up	08:33:17 - 08:51:48	9678
North Lake	08:42:28	-66.9	Dark	Down	41.8	233.4	Up	08:33:12 - 08:51:43	9652
Niwot	08:41:37	-62.7	Dark	Down	33.1	250.1	Up	08:32:22 - 08:50:53	9645
Paisley	08:42:26	-67.3	Dark	Down	41.9	234.1	Up	08:33:11 - 08:51:42	9613
Chiloquin	08:42:29	-67.7	Dark	Down	42.8	232.8	Up	08:33:14 - 08:51:45	9582
Lakeview	08:42:24	-67.7	Dark	Down	42.1	234.7	Up	08:33:08 - 08:51:39	9574
Klamath Falls	08:42:28	-68.0	Dark	Down	42.9	233.2	Up	08:33:12 - 08:51:43	9555
Tulelake	08:42:27	-68.2	Dark	Down	42.9	233.7	Up	08:33:12 - 08:51:43	9537
Cedarville	08:42:21	-68.3	Dark	Down	42.4	235.4	Up	08:33:06 - 08:51:37	9522
Fall River/Burney	08:42:25	-69.1	Dark	Down	43.4	234.5	Up	08:33:09 - 08:51:40	9463
Susanville	08:42:20	-69.5	Dark	Down	43.3	235.7	Up	08:33:04 - 08:51:35	9421
Gimple	08:42:21	-69.8	Dark	Down	43.6	235.7	Up	08:33:05 - 08:51:36	9394
Greenville	08:42:20	-69.8	Dark	Down	43.7	235.6	Up	08:33:05 - 08:51:36	9393
Quincy	08:42:20	-70.0	Dark	Down	43.8	235.8	Up	08:33:04 - 08:51:35	9376
Portola	08:42:18	-70.0	Dark	Down	43.6	236.4	Up	08:33:03 - 08:51:34	9373
Reno	08:42:16	-70.1	Dark	Down	43.3	237.3	Up	08:33:00 - 08:51:31	9361
Carson City	08:42:15	-70.4	Dark	Down	43.5	237.6	Up	08:32:59 - 08:51:30	9330
Yerington	08:42:12	-70.4	Dark	Down	43.2	238.3	Up	08:32:57 - 08:51:28	9324
Gardnerville	08:42:14	-70.6	Dark	Down	43.6	237.8	Up	08:32:59 - 08:51:30	9310
Hawthorne	08:42:09	-70.6	Dark	Down	43.1	239.2	Up	08:32:54 - 08:51:25	9293
Tonopah	08:42:04	-70.4	Dark	Down	42.3	241.0	Up	08:32:49 - 08:51:20	9276
Lee Vining	08:42:08	-71.3	Dark	Down	43.7	239.2	Up	08:32:53 - 08:51:24	9236
Bishop	08:42:05	-71.5	Dark	Down	43.5	240.4	Up	08:32:50 - 08:51:21	9195
Beatty	08:41:58	-71.2	Dark	Down	42.6	242.3	Up	08:32:43 - 08:51:14	9182
Indian Springs	08:41:55	-71.0	Dark	Down	42.0	243.6	Up	08:32:40 - 08:51:11	9172
Henderson	08:41:51	-71.1	Dark	Down	41.7	244.6	Up	08:32:35 - 08:51:06	9137
Lone Pine	08:42:02	-72.0	Dark	Down	43.6	241.3	Up	08:32:46 - 08:51:17	9134
Patrick	08:41:46	-70.9	Dark	Down	41.2	246.1	Up	08:32:31 - 08:51:02	9100
Searchlight/Boulder City	08:41:49	-71.5	Dark	Down	41.9	245.1	Up	08:32:33 - 08:51:04	9087
DCO	08:41:44	-70.7	Dark	Down	40.8	246.9	Up	08:32:28 - 08:50:59	9086
Kingman/Dolan Springs	08:41:46	-71.2	Dark	Down	41.4	246.1	Up	08:32:30 - 08:51:01	9077
Laughlin/Bullhead City	08:41:48	-71.5	Dark	Down	41.8	245.7	Up	08:32:33 - 08:51:04	9067
Mohave Valley	08:41:47	-71.7	Dark	Down	41.9	245.9	Up	08:32:32 - 08:51:03	9042
Lake Havasu City	08:41:46	-71.8	Dark	Down	41.9	246.5	Up	08:32:31 - 08:51:02	9011
Parker	08:41:45	-72.1	Dark	Down	42.0	246.8	Up	08:32:29 - 08:51:00	8979
CPSLO	08:42:07	-74.2	Dark	Down	46.1	239.9	Up	08:32:51 - 08:51:22	8974
Blythe	08:41:44	-72.6	Dark	Down	42.4	246.9	Up	08:32:28 - 08:50:59	8927
Idyllwild	08:41:51	-73.7	Dark	Down	44.0	245.0	Up	08:32:35 - 08:51:06	8900
Wildwood	08:41:58	-74.4	Dark	Down	45.2	243.0	Up	08:32:42 - 08:51:13	8900
Calipatria	08:41:45	-73.5	Dark	Down	43.3	246.6	Up	08:32:30 - 08:51:01	8865
Yuma	08:41:41	-73.3	Dark	Down	42.8	247.7	Up	08:32:25 - 08:50:56	8841

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 55638, (2018/01/16 08:44UT)
Object            RA         Dec     mag  sep  mel
Betelgeuse     05:55:10.3 +07:24:26  0.4  0.51 156
Bellatrix      05:25:07.8 +06:20:58  1.6  7.12 150
52 Ori         05:48:00.2 +06:27:15  5.5  1.78 154
PPM 149627     05:54:28.7 +08:03:15  7.2  0.50 157
PPM 149617     05:54:03.6 +07:42:48  9.5  0.19 156
PPM 149610     05:53:39.5 +07:34:36 10.7  0.10 156
55638          05:53:20.6 +07:38:07 15.1       156
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:11:29 UT

RECON