RECON: TNO occultation with 99HG12

Event between 99HG12 and star UC4-356-073264 with event index number of 328181

Geocentric closest approach at 2020/05/21 04:36:56 UTC

J2000 position of star is 15:20:33.3 -18:48:57
Equinox of date position of star is 15:21:37.7 -18:52:58
Stellar brightness R=16.2, use SENSEUP=128
Star is 170 degrees from the moon. Moon is 2% illuminated.
TNO apparent brightness V=23.2

[RECON map]
TNO is 40.0 AU from the Sun and 39.0 AU from the Earth.
The TNO is moving 24.4 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 601 seconds.
The 1-sigma cross-track error in the shadow position is 5717 km.
The sky-plane scale is 28306.6 km/arcsec.

The TNO has an absolute magnitude Hv=7.2
Diameter=220.8 km assuming a 5% albedo -- 9.1 sec chord
Diameter=90.1 km assuming a 30% albedo -- 3.7 sec chord
Dynamical classification is 7:4EEE
 
 
 
 
 
 

Star training set for 99HG12, (2020/05/21 04:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:39.6 -26:28:32  0.9 17.60 152
27Bet Lib      15:18:06.4 -09:27:25  2.6  9.47 172
28 Lib         15:22:03.3 -18:13:52  6.4  0.66 170
PPM 230114     15:22:13.1 -18:43:46  8.5  0.20 170
PPM 230111     15:22:10.7 -18:57:30  8.6  0.13 170
99HG12         15:21:43.1 -18:53:18 16.2       169
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 1.5 sigma about the mid-time.
The median site spacing is 10.5 km RECON observability=0.4 and success probability=3.8%

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Kelowna	04:39:41	-7.7	NT	Down	12.6	141.1	Really Low	04:24:41 - 04:54:41	5094
Summerland	04:39:41	-7.6	NT	Down	12.5	140.8	Really Low	04:24:41 - 04:54:41	5081
Penticton	04:39:41	-7.9	NT	Down	12.8	140.9	Really Low	04:24:41 - 04:54:41	5067
Okanagan Falls	04:39:42	-8.0	NT	Down	13.0	140.9	Really Low	04:24:42 - 04:54:42	5055
Oliver	04:39:42	-8.2	NT	Down	13.1	140.9	Really Low	04:24:42 - 04:54:42	5046
Anarchist Mountain Observatory	04:39:42	-8.4	NT	Down	13.3	141.0	Really Low	04:24:42 - 04:54:42	5041
Oroville	04:39:42	-8.4	NT	Down	13.3	140.9	Really Low	04:24:42 - 04:54:42	5034
Tonasket	04:39:42	-8.5	NT	Down	13.5	140.9	Really Low	04:24:42 - 04:54:42	5020
Okanogan	04:39:44	-8.7	NT	Down	13.7	140.7	Really Low	04:24:44 - 04:54:44	4996
Brewster	04:39:43	-8.8	NT	Down	13.8	140.5	Really Low	04:24:43 - 04:54:43	4973
Manson/Chelan	04:39:45	-8.8	NT	Down	13.8	140.2	Really Low	04:24:45 - 04:54:45	4949
Entiat	04:39:45	-8.9	NT	Down	14.0	140.1	Really Low	04:24:45 - 04:54:45	4933
Wenatchee	04:39:46	-9.0	NT	Down	14.1	140.0	Really Low	04:24:46 - 04:54:46	4914
Niwot	04:39:17	-21.6	Dark	Down	26.2	152.2	Low	04:24:17 - 04:54:17	4907
Ellensburg	04:39:47	-9.2	NT	Down	14.4	139.7	Really Low	04:24:47 - 04:54:47	4882
Pasco	04:39:45	-10.4	NT	Down	15.6	140.8	Really Low	04:24:45 - 04:54:45	4877
PNWRO	04:39:46	-10.7	NT	Down	15.8	141.0	Really Low	04:24:46 - 04:54:46	4868
Yakima	04:39:48	-9.5	NT	Down	14.7	139.6	Really Low	04:24:48 - 04:54:48	4855
George/Umatilla	04:39:47	-10.6	NT	Down	15.7	140.6	Really Low	04:24:47 - 04:54:47	4848
Toppenish/White Swan	04:39:48	-9.7	NT	Down	14.9	139.7	Really Low	04:24:48 - 04:54:48	4846
Goldendale	04:39:50	-9.9	NT	Down	15.1	139.3	Really Low	04:24:50 - 04:54:50	4797
The Dalles	04:39:51	-9.9	NT	Down	15.1	138.9	Really Low	04:24:51 - 04:54:51	4771
Maupin	04:39:51	-10.2	NT	Down	15.5	138.9	Really Low	04:24:51 - 04:54:51	4747
Madras/Culver	04:39:52	-10.5	NT	Down	15.9	138.8	Really Low	04:24:52 - 04:54:52	4709
Redmond	04:39:53	-10.8	NT	Down	16.1	138.7	Really Low	04:24:53 - 04:54:53	4683
Sisters	04:39:53	-10.5	NT	Down	15.9	138.4	Really Low	04:24:53 - 04:54:53	4672
Bend	04:39:53	-10.8	NT	Down	16.2	138.5	Really Low	04:24:53 - 04:54:53	4664
Oregon Observatory	04:39:54	-10.9	NT	Down	16.3	138.4	Really Low	04:24:54 - 04:54:54	4648
La Pine/Gilchrist	04:39:54	-11.0	NT	Down	16.4	138.3	Really Low	04:24:54 - 04:54:54	4632
North Lake	04:39:54	-11.6	NT	Down	17.1	138.7	Really Low	04:24:54 - 04:54:54	4621
Paisley	04:39:53	-12.2	AT	Down	17.6	138.9	Really Low	04:24:53 - 04:54:53	4595
Lakeview	04:39:54	-12.6	AT	Down	18.1	139.0	Really Low	04:24:54 - 04:54:54	4565
Chiloquin	04:39:57	-11.5	NT	Down	17.1	137.8	Really Low	04:24:57 - 04:54:57	4543
Cedarville	04:39:54	-13.2	AT	Down	18.7	139.0	Really Low	04:24:54 - 04:54:54	4525
Klamath Falls	04:39:57	-11.8	NT	Down	17.4	137.8	Really Low	04:24:57 - 04:54:57	4522
Tulelake	04:39:57	-12.2	AT	Down	17.7	138.0	Really Low	04:24:57 - 04:54:57	4512
Fall River/Burney	04:39:57	-12.8	AT	Down	18.5	137.9	Really Low	04:24:57 - 04:54:57	4450
Susanville	04:39:57	-13.7	AT	Down	19.3	138.3	Really Low	04:24:57 - 04:54:57	4429
Gimple	04:39:59	-13.7	AT	Down	19.4	138.1	Really Low	04:24:59 - 04:54:59	4402
Greenville	04:39:58	-13.7	AT	Down	19.4	138.0	Really Low	04:24:58 - 04:54:58	4399
Reno	04:39:56	-14.7	AT	Down	20.4	138.8	Low	04:24:56 - 04:54:56	4394
Portola	04:39:57	-14.2	AT	Down	19.8	138.4	Really Low	04:24:57 - 04:54:57	4391
Quincy	04:39:58	-13.8	AT	Down	19.5	138.0	Really Low	04:24:58 - 04:54:58	4384
Yerington	04:39:55	-15.5	AT	Down	21.1	139.3	Low	04:24:55 - 04:54:55	4375
Tonopah	04:39:51	-17.2	AT	Down	22.8	140.7	Low	04:24:51 - 04:54:51	4373
Carson City	04:39:57	-15.0	AT	Down	20.7	138.8	Low	04:24:57 - 04:54:57	4368
Hawthorne	04:39:54	-16.1	AT	Down	21.7	139.6	Low	04:24:54 - 04:54:54	4359
Gardnerville	04:39:57	-15.2	AT	Down	20.9	138.7	Low	04:24:57 - 04:54:57	4352
Indian Springs	04:39:49	-19.1	Dark	Down	24.7	141.6	Low	04:24:49 - 04:54:49	4315
Beatty	04:39:52	-18.3	Dark	Down	23.9	140.8	Low	04:24:52 - 04:54:52	4302
Lee Vining	04:39:56	-16.2	AT	Down	21.9	139.0	Low	04:24:56 - 04:54:56	4300
Henderson	04:39:47	-19.9	Dark	Down	25.5	142.1	Low	04:24:47 - 04:54:47	4299
DCO	04:39:43	-21.6	Dark	Down	27.1	143.4	Low	04:24:43 - 04:54:43	4292
Patrick	04:39:45	-21.0	Dark	Down	26.5	142.9	Low	04:24:45 - 04:54:45	4290
Bishop	04:39:55	-17.0	AT	Down	22.8	139.5	Low	04:24:55 - 04:54:55	4280
Kingman/Dolan Springs	04:39:46	-21.0	Dark	Down	26.6	142.6	Low	04:24:46 - 04:54:46	4267
Searchlight/Boulder City	04:39:48	-20.3	Dark	Down	26.0	142.0	Low	04:24:48 - 04:54:48	4257
Laughlin/Bullhead City	04:39:47	-20.7	Dark	Down	26.4	142.2	Low	04:24:47 - 04:54:47	4247
Lone Pine	04:39:55	-17.7	AT	Down	23.5	139.6	Low	04:24:55 - 04:54:55	4235
Mohave Valley	04:39:47	-20.9	Dark	Down	26.6	142.1	Low	04:24:47 - 04:54:47	4226
Lake Havasu City	04:39:47	-21.4	Dark	Down	27.0	142.2	Low	04:24:47 - 04:54:47	4204
Parker	04:39:47	-21.6	Dark	Down	27.3	142.1	Low	04:24:47 - 04:54:47	4178
Blythe	04:39:48	-21.8	Dark	Down	27.6	141.7	Low	04:24:48 - 04:54:48	4127
Idyllwild	04:39:54	-20.5	Dark	Down	26.4	139.9	Low	04:24:54 - 04:54:54	4060
Calipatria	04:39:51	-21.7	Dark	Down	27.5	140.7	Low	04:24:51 - 04:54:51	4055
Yuma	04:39:49	-22.5	Dark	Down	28.3	141.3	Low	04:24:49 - 04:54:49	4053
CPSLO	04:40:03	-17.1	AT	Down	23.1	137.0	Low	04:25:03 - 04:55:03	4043
Wildwood	04:39:59	-19.1	Dark	Down	25.1	138.4	Low	04:24:59 - 04:54:59	4021

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 99HG12, (2020/05/21 04:37UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 17.60 152
27Bet Lib      15:17:00.3 -09:22:59  2.6  9.47 172
28 Lib         15:20:53.7 -18:09:32  6.4  0.66 170
PPM 230114     15:21:03.3 -18:39:25  8.5  0.20 170
PPM 230111     15:21:00.9 -18:53:10  8.6  0.13 170
99HG12         15:20:33.3 -18:48:57 16.2       170
Positions are for J2000

Event circumstances last updated at 2018/10/26 21:08:58 UT

RECON