RECON: TNO occultation with 85627

Event between (85627) 98HP151 and star UC4-335-089551 with event index number of 65897

Geocentric closest approach at 2017/05/27 08:19:52 UTC

J2000 position of star is 16:57:24.8 -23:10:47
Equinox of date position of star is 16:58:27.8 -23:12:20
Stellar brightness R=16.4, use SENSEUP=128
Star is 167 degrees from the moon. Moon is 4% illuminated.
TNO apparent brightness V=23.5

[RECON map]
TNO is 41.4 AU from the Sun and 40.4 AU from the Earth.
The TNO is moving 24.2 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 618 seconds.
The 1-sigma cross-track error in the shadow position is 4154 km.
The sky-plane scale is 29323.0 km/arcsec.

The TNO has an absolute magnitude Hv=7.4
Diameter=199.5 km assuming a 5% albedo -- 8.3 sec chord
Diameter=81.5 km assuming a 30% albedo -- 3.4 sec chord
Dynamical classification is CLASSICAL

Star training set for 85627, (2017/05/27 08:20UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:28.6 -26:28:09  0.9  7.14 160
23Tau Sco      16:36:58.1 -28:15:02  2.8  6.99 160
26 Oph         17:01:13.6 -25:00:51  5.8  1.92 167
PPM 266128     16:55:54.1 -23:32:22  6.9  0.68 166
PPM 266183     16:58:38.7 -23:20:40  8.7  0.14 167
85627          16:58:27.9 -23:12:20 16.4       167
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 9.7 km RECON observability=0.9 and success probability=4.4%

Site Site mid-time
(UT) Sun alt
(deg) Sky Moon Star alt
(deg) Star az
(deg) Target Observing Time
(UT) X-track
(km)

Oroville 08:20:27 -19.5 Dark Down 17.8 176.5 Really Low 08:05:27 - 08:35:27 835

Tonasket 08:20:27 -19.7 Dark Down 18.0 176.5 Really Low 08:05:27 - 08:35:27 827

Okanogan 08:20:27 -20.1 Dark Down 18.4 176.4 Really Low 08:05:27 - 08:35:27 814

Brewster 08:20:28 -20.3 Dark Down 18.6 176.2 Really Low 08:05:28 - 08:35:28 803

Manson/Chelan 08:20:29 -20.6 Dark Down 18.8 175.8 Really Low 08:05:29 - 08:35:29 791

Entiat 08:20:29 -20.8 Dark Down 19.0 175.7 Really Low 08:05:29 - 08:35:29 783

Wenatchee 08:20:30 -21.1 Dark Down 19.3 175.6 Really Low 08:05:30 - 08:35:30 772

Ellensburg 08:20:30 -21.5 Dark Down 19.7 175.4 Really Low 08:05:30 - 08:35:30 755

Pasco 08:20:26 -22.1 Dark Down 20.5 176.8 Low 08:05:26 - 08:35:26 739

Yakima 08:20:30 -21.9 Dark Down 20.1 175.4 Low 08:05:30 - 08:35:30 739

PNWRO 08:20:25 -22.4 Dark Down 20.8 177.0 Low 08:05:25 - 08:35:25 732

Toppenish/White Swan 08:20:30 -22.1 Dark Down 20.3 175.6 Low 08:05:30 - 08:35:30 732

George/Umatilla 08:20:26 -22.5 Dark Down 20.8 176.6 Low 08:05:26 - 08:35:26 724

Goldendale 08:20:31 -22.7 Dark Down 20.9 175.1 Low 08:05:31 - 08:35:31 706

The Dalles 08:20:33 -22.9 Dark Down 21.1 174.8 Low 08:05:33 - 08:35:33 692

Maupin 08:20:32 -23.3 Dark Down 21.5 174.8 Low 08:05:32 - 08:35:32 677

Madras/Culver 08:20:32 -23.9 Dark Down 22.0 174.8 Low 08:05:32 - 08:35:32 654

Redmond 08:20:33 -24.2 Dark Down 22.4 174.7 Low 08:05:33 - 08:35:33 638

Sisters 08:20:34 -24.2 Dark Down 22.3 174.3 Low 08:05:34 - 08:35:34 635

Bend 08:20:33 -24.5 Dark Down 22.6 174.6 Low 08:05:33 - 08:35:33 627

Oregon Observatory 08:20:33 -24.6 Dark Down 22.7 174.4 Low 08:05:33 - 08:35:33 618

La Pine/Gilchrist 08:20:34 -24.9 Dark Down 22.9 174.4 Low 08:05:34 - 08:35:34 609

North Lake 08:20:32 -25.2 Dark Down 23.4 175.0 Low 08:05:32 - 08:35:32 596

Paisley 08:20:31 -25.8 Dark Down 24.0 175.3 Low 08:05:31 - 08:35:31 574

Chiloquin 08:20:35 -26.0 Dark Down 24.0 174.0 Low 08:05:35 - 08:35:35 554

Lakeview 08:20:30 -26.3 Dark Down 24.5 175.5 Low 08:05:30 - 08:35:30 553

Niwot 08:19:38 -25.7 Dark Down 26.0 190.7 Low 08:04:38 - 08:34:38 552

Klamath Falls 08:20:35 -26.3 Dark Down 24.4 174.0 Low 08:05:35 - 08:35:35 539

Tulelake 08:20:34 -26.6 Dark Down 24.7 174.3 Low 08:05:34 - 08:35:34 530

Cedarville 08:20:30 -26.9 Dark Down 25.2 175.6 Low 08:05:30 - 08:35:30 524

Fall River/Burney 08:20:33 -27.5 Dark Down 25.6 174.4 Low 08:05:33 - 08:35:33 487

Susanville 08:20:31 -28.0 Dark Down 26.2 175.1 Low 08:05:31 - 08:35:31 464

Gimple 08:20:32 -28.3 Dark Down 26.5 174.9 Low 08:05:32 - 08:35:32 448

Greenville 08:20:32 -28.3 Dark Down 26.5 174.8 Low 08:05:32 - 08:35:32 447

Quincy 08:20:32 -28.5 Dark Down 26.7 174.8 Low 08:05:32 - 08:35:32 437

Portola 08:20:30 -28.6 Dark Down 26.9 175.2 Low 08:05:30 - 08:35:30 436

Reno 08:20:28 -28.9 Dark Down 27.2 175.9 Low 08:05:28 - 08:35:28 430

Carson City 08:20:28 -29.2 Dark Down 27.5 175.9 Low 08:05:28 - 08:35:28 411

Yerington 08:20:26 -29.3 Dark Down 27.8 176.6 Low 08:05:26 - 08:35:26 408

Gardnerville 08:20:28 -29.4 Dark Down 27.8 175.9 Low 08:05:28 - 08:35:28 399

Hawthorne 08:20:24 -29.7 Dark Down 28.2 177.1 Low 08:05:24 - 08:35:24 389

Tonopah 08:20:20 -30.1 Dark Down 28.7 178.5 Low 08:05:20 - 08:35:20 378

Lee Vining 08:20:26 -30.4 Dark Down 28.8 176.6 Low 08:05:26 - 08:35:26 354

Bishop 08:20:23 -30.9 Dark Down 29.4 177.3 Low 08:05:23 - 08:35:23 329

Beatty 08:20:18 -31.1 Dark Down 29.9 179.0 Low 08:05:18 - 08:35:18 319

Indian Springs 08:20:14 -31.3 Dark Down 30.2 180.1 Up 08:05:14 - 08:35:14 311

Lone Pine 08:20:22 -31.6 Dark Down 30.2 177.6 Up 08:05:22 - 08:35:22 290

Henderson 08:20:11 -31.7 Dark Down 30.8 180.9 Up 08:05:11 - 08:35:11 286

Patrick 08:20:07 -32.1 Dark Down 31.4 182.0 Up 08:05:07 - 08:35:07 260

Searchlight/Boulder City 08:20:11 -32.3 Dark Down 31.3 180.9 Up 08:05:11 - 08:35:11 255

DCO 08:20:04 -32.3 Dark Down 31.7 182.8 Up 08:05:04 - 08:35:04 248

Kingman/Dolan Springs 08:20:08 -32.4 Dark Down 31.6 181.8 Up 08:05:08 - 08:35:08 246

Laughlin/Bullhead City 08:20:09 -32.5 Dark Down 31.6 181.3 Up 08:05:09 - 08:35:09 239

Mohave Valley 08:20:09 -32.8 Dark Down 31.9 181.3 Up 08:05:09 - 08:35:09 224

Lake Havasu City 08:20:08 -33.1 Dark Down 32.3 181.6 Up 08:05:08 - 08:35:08 202

CPSLO 08:20:31 -33.1 Dark Down 31.3 174.8 Up 08:05:31 - 08:35:31 187

Parker 08:20:08 -33.4 Dark Down 32.7 181.6 Up 08:05:08 - 08:35:08 182

Blythe 08:20:09 -34.0 Dark Down 33.2 181.3 Up 08:05:09 - 08:35:09 148

Wildwood 08:20:24 -34.1 Dark Down 32.7 177.0 Up 08:05:24 - 08:35:24 139

Idyllwild 08:20:17 -34.2 Dark Down 33.1 179.0 Up 08:05:17 - 08:35:17 137

Calipatria 08:20:12 -34.7 Dark Down 33.7 180.3 Up 08:05:12 - 08:35:12 111

Yuma 08:20:09 -34.9 Dark Down 34.1 181.3 Up 08:05:09 - 08:35:09 91

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 85627, (2017/05/27 08:20UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9  7.14 160
23Tau Sco      16:35:53.0 -28:12:58  2.8  6.99 160
26 Oph         17:00:09.6 -24:59:22  5.8  1.92 167
PPM 266128     16:54:50.8 -23:30:45  6.9  0.68 166
PPM 266183     16:57:35.5 -23:19:07  8.7  0.14 167
85627          16:57:24.8 -23:10:47 16.4       167
Positions are for J2000

Event circumstances last updated at 2017/05/16 18:27:29 UT

Marc W. Buie, Southwest Research Institute

RECON

Site	Site mid-time (UT)	Sun alt (deg)	Sky	Moon	Star alt (deg)	Star az (deg)	Target	Observing Time (UT)	X-track (km)
Oroville	08:20:27	-19.5	Dark	Down	17.8	176.5	Really Low	08:05:27 - 08:35:27	835
Tonasket	08:20:27	-19.7	Dark	Down	18.0	176.5	Really Low	08:05:27 - 08:35:27	827
Okanogan	08:20:27	-20.1	Dark	Down	18.4	176.4	Really Low	08:05:27 - 08:35:27	814
Brewster	08:20:28	-20.3	Dark	Down	18.6	176.2	Really Low	08:05:28 - 08:35:28	803
Manson/Chelan	08:20:29	-20.6	Dark	Down	18.8	175.8	Really Low	08:05:29 - 08:35:29	791
Entiat	08:20:29	-20.8	Dark	Down	19.0	175.7	Really Low	08:05:29 - 08:35:29	783
Wenatchee	08:20:30	-21.1	Dark	Down	19.3	175.6	Really Low	08:05:30 - 08:35:30	772
Ellensburg	08:20:30	-21.5	Dark	Down	19.7	175.4	Really Low	08:05:30 - 08:35:30	755
Pasco	08:20:26	-22.1	Dark	Down	20.5	176.8	Low	08:05:26 - 08:35:26	739
Yakima	08:20:30	-21.9	Dark	Down	20.1	175.4	Low	08:05:30 - 08:35:30	739
PNWRO	08:20:25	-22.4	Dark	Down	20.8	177.0	Low	08:05:25 - 08:35:25	732
Toppenish/White Swan	08:20:30	-22.1	Dark	Down	20.3	175.6	Low	08:05:30 - 08:35:30	732
George/Umatilla	08:20:26	-22.5	Dark	Down	20.8	176.6	Low	08:05:26 - 08:35:26	724
Goldendale	08:20:31	-22.7	Dark	Down	20.9	175.1	Low	08:05:31 - 08:35:31	706
The Dalles	08:20:33	-22.9	Dark	Down	21.1	174.8	Low	08:05:33 - 08:35:33	692
Maupin	08:20:32	-23.3	Dark	Down	21.5	174.8	Low	08:05:32 - 08:35:32	677
Madras/Culver	08:20:32	-23.9	Dark	Down	22.0	174.8	Low	08:05:32 - 08:35:32	654
Redmond	08:20:33	-24.2	Dark	Down	22.4	174.7	Low	08:05:33 - 08:35:33	638
Sisters	08:20:34	-24.2	Dark	Down	22.3	174.3	Low	08:05:34 - 08:35:34	635
Bend	08:20:33	-24.5	Dark	Down	22.6	174.6	Low	08:05:33 - 08:35:33	627
Oregon Observatory	08:20:33	-24.6	Dark	Down	22.7	174.4	Low	08:05:33 - 08:35:33	618
La Pine/Gilchrist	08:20:34	-24.9	Dark	Down	22.9	174.4	Low	08:05:34 - 08:35:34	609
North Lake	08:20:32	-25.2	Dark	Down	23.4	175.0	Low	08:05:32 - 08:35:32	596
Paisley	08:20:31	-25.8	Dark	Down	24.0	175.3	Low	08:05:31 - 08:35:31	574
Chiloquin	08:20:35	-26.0	Dark	Down	24.0	174.0	Low	08:05:35 - 08:35:35	554
Lakeview	08:20:30	-26.3	Dark	Down	24.5	175.5	Low	08:05:30 - 08:35:30	553
Niwot	08:19:38	-25.7	Dark	Down	26.0	190.7	Low	08:04:38 - 08:34:38	552
Klamath Falls	08:20:35	-26.3	Dark	Down	24.4	174.0	Low	08:05:35 - 08:35:35	539
Tulelake	08:20:34	-26.6	Dark	Down	24.7	174.3	Low	08:05:34 - 08:35:34	530
Cedarville	08:20:30	-26.9	Dark	Down	25.2	175.6	Low	08:05:30 - 08:35:30	524
Fall River/Burney	08:20:33	-27.5	Dark	Down	25.6	174.4	Low	08:05:33 - 08:35:33	487
Susanville	08:20:31	-28.0	Dark	Down	26.2	175.1	Low	08:05:31 - 08:35:31	464
Gimple	08:20:32	-28.3	Dark	Down	26.5	174.9	Low	08:05:32 - 08:35:32	448
Greenville	08:20:32	-28.3	Dark	Down	26.5	174.8	Low	08:05:32 - 08:35:32	447
Quincy	08:20:32	-28.5	Dark	Down	26.7	174.8	Low	08:05:32 - 08:35:32	437
Portola	08:20:30	-28.6	Dark	Down	26.9	175.2	Low	08:05:30 - 08:35:30	436
Reno	08:20:28	-28.9	Dark	Down	27.2	175.9	Low	08:05:28 - 08:35:28	430
Carson City	08:20:28	-29.2	Dark	Down	27.5	175.9	Low	08:05:28 - 08:35:28	411
Yerington	08:20:26	-29.3	Dark	Down	27.8	176.6	Low	08:05:26 - 08:35:26	408
Gardnerville	08:20:28	-29.4	Dark	Down	27.8	175.9	Low	08:05:28 - 08:35:28	399
Hawthorne	08:20:24	-29.7	Dark	Down	28.2	177.1	Low	08:05:24 - 08:35:24	389
Tonopah	08:20:20	-30.1	Dark	Down	28.7	178.5	Low	08:05:20 - 08:35:20	378
Lee Vining	08:20:26	-30.4	Dark	Down	28.8	176.6	Low	08:05:26 - 08:35:26	354
Bishop	08:20:23	-30.9	Dark	Down	29.4	177.3	Low	08:05:23 - 08:35:23	329
Beatty	08:20:18	-31.1	Dark	Down	29.9	179.0	Low	08:05:18 - 08:35:18	319
Indian Springs	08:20:14	-31.3	Dark	Down	30.2	180.1	Up	08:05:14 - 08:35:14	311
Lone Pine	08:20:22	-31.6	Dark	Down	30.2	177.6	Up	08:05:22 - 08:35:22	290
Henderson	08:20:11	-31.7	Dark	Down	30.8	180.9	Up	08:05:11 - 08:35:11	286
Patrick	08:20:07	-32.1	Dark	Down	31.4	182.0	Up	08:05:07 - 08:35:07	260
Searchlight/Boulder City	08:20:11	-32.3	Dark	Down	31.3	180.9	Up	08:05:11 - 08:35:11	255
DCO	08:20:04	-32.3	Dark	Down	31.7	182.8	Up	08:05:04 - 08:35:04	248
Kingman/Dolan Springs	08:20:08	-32.4	Dark	Down	31.6	181.8	Up	08:05:08 - 08:35:08	246
Laughlin/Bullhead City	08:20:09	-32.5	Dark	Down	31.6	181.3	Up	08:05:09 - 08:35:09	239
Mohave Valley	08:20:09	-32.8	Dark	Down	31.9	181.3	Up	08:05:09 - 08:35:09	224
Lake Havasu City	08:20:08	-33.1	Dark	Down	32.3	181.6	Up	08:05:08 - 08:35:08	202
CPSLO	08:20:31	-33.1	Dark	Down	31.3	174.8	Up	08:05:31 - 08:35:31	187
Parker	08:20:08	-33.4	Dark	Down	32.7	181.6	Up	08:05:08 - 08:35:08	182
Blythe	08:20:09	-34.0	Dark	Down	33.2	181.3	Up	08:05:09 - 08:35:09	148
Wildwood	08:20:24	-34.1	Dark	Down	32.7	177.0	Up	08:05:24 - 08:35:24	139
Idyllwild	08:20:17	-34.2	Dark	Down	33.1	179.0	Up	08:05:17 - 08:35:17	137
Calipatria	08:20:12	-34.7	Dark	Down	33.7	180.3	Up	08:05:12 - 08:35:12	111
Yuma	08:20:09	-34.9	Dark	Down	34.1	181.3	Up	08:05:09 - 08:35:09	91