RECON: TNO occultation with 278361

Event between (278361) 07JJ43 and star GA0640:15787297 with event index number of 2182183

Geocentric closest approach at 2025/07/05 08:14:52 UTC

J2000 position of star is 17:27:21.6 -25:16:38
Equinox of date position of star is 17:28:51.0 -25:17:46
Stellar brightness G=16.7, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 41 degrees from the moon. Moon is 73% illuminated.
Apparent brightness V=20.6

[RECON map]
Object is 40.6 AU from the Sun and 39.6 AU from the Earth.
Apparent velocity is 22.6 km/sec on the sky relative to the star, or, 2.8 arcsec/hr.
The 1-sigma error in the time of the event is 308 seconds.
The 1-sigma cross-track error in the shadow position is 2317 km.
The sky-plane scale is 28744.9 km/arcsec.

The object has an absolute magnitude Hv=4.5
Diameter=758.6 km assuming a 5% albedo -- 33.8 sec chord
Diameter=309.7 km assuming a 30% albedo -- 13.8 sec chord
Dynamical classification is SCATNEAR

Star training set for 278361, (2025/07/05 08:03UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:58.5 -26:29:11  0.9 13.08  29
35Eta Oph      17:11:50.6 -15:45:17  2.6 10.34  38
44 Oph         17:27:55.8 -24:11:47  4.2  1.12  41
PPM 266914     17:30:13.4 -25:31:47  7.4  0.37  42
PPM 266880     17:28:35.2 -25:17:30  9.4  0.08  41
278361         17:28:56.0 -25:17:49 16.7        42
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 2.9 sigma about the mid-time.
The median site spacing is 18.2 km RECON observability=0.4 and success probability=6.3%

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

Kamloops 08:14:09 -16.6 AT Down 10.9 202.8 Really Low 07:59:09 - 08:29:09 2038

Kelowna 08:14:05 -17.3 AT Down 11.4 203.7 Really Low 07:59:05 - 08:29:05 2011

Peachland 08:14:05 -17.5 AT Down 11.6 203.4 Really Low 07:59:05 - 08:29:05 2010

Summerland 08:14:05 -17.6 AT Down 11.7 203.5 Really Low 07:59:05 - 08:29:05 2005

Penticton 08:14:05 -17.7 AT Down 11.8 203.6 Really Low 07:59:05 - 08:29:05 2003

Oliver 08:14:04 -18.0 Dark Down 12.1 203.6 Really Low 07:59:04 - 08:29:04 1993

Victoria 08:14:15 -18.7 Dark Up 13.6 200.3 Really Low 07:59:15 - 08:29:15 1991

Anarchist Mountain Observatory 08:14:03 -18.2 Dark Down 12.2 203.8 Really Low 07:59:03 - 08:29:03 1987

Okanogan 08:14:03 -18.8 Dark Down 12.8 203.7 Really Low 07:59:03 - 08:29:03 1969

Brewster 08:14:03 -19.1 Dark Down 13.1 203.5 Really Low 07:59:03 - 08:29:03 1961

Manson/Chelan 08:14:04 -19.3 Dark Down 13.4 203.2 Really Low 07:59:04 - 08:29:04 1957

Sleaford 08:13:34 -13.8 AT Down 5.4 215.0 Really Low 07:58:34 - 08:28:34 1951

Wenatchee 08:14:03 -19.8 Dark Down 13.9 203.1 Really Low 07:59:03 - 08:29:03 1943

Ellensburg 08:14:03 -20.2 Dark Down 14.4 203.0 Really Low 07:59:03 - 08:29:03 1931

Yakima 08:14:03 -20.6 Dark Down 14.7 203.0 Really Low 07:59:03 - 08:29:03 1917

Toppenish/White Swan 08:14:02 -20.9 Dark Down 14.9 203.2 Really Low 07:59:02 - 08:29:02 1909

PNWRO 08:13:57 -21.2 Dark Down 14.8 204.5 Really Low 07:58:57 - 08:28:57 1888

The Dalles 08:14:03 -21.6 Dark Up 15.8 202.5 Really Low 07:59:03 - 08:29:03 1886

Maupin 08:14:02 -22.1 Dark Up 16.2 202.7 Really Low 07:59:02 - 08:29:02 1871

Sisters 08:14:02 -23.0 Dark Up 17.1 202.3 Really Low 07:59:02 - 08:29:02 1842

Bend 08:14:01 -23.2 Dark Up 17.3 202.6 Really Low 07:59:01 - 08:29:01 1831

Oregon Observatory 08:14:01 -23.4 Dark Up 17.5 202.5 Really Low 07:59:01 - 08:29:01 1826

Chiloquin 08:14:01 -24.7 Dark Up 18.8 202.3 Really Low 07:59:01 - 08:29:01 1776

Klamath Falls 08:14:00 -25.0 Dark Up 19.1 202.4 Really Low 07:59:00 - 08:29:00 1761

Cedarville 08:13:53 -25.7 Dark Up 19.3 203.9 Really Low 07:58:53 - 08:28:53 1723

Fall River/Burney 08:13:57 -26.2 Dark Up 20.1 202.9 Low 07:58:57 - 08:28:57 1709

Greenville 08:13:54 -27.1 Dark Up 20.8 203.4 Low 07:58:54 - 08:28:54 1667

Gimple 08:13:54 -27.1 Dark Up 20.8 203.5 Low 07:58:54 - 08:28:54 1666

Quincy 08:13:54 -27.3 Dark Up 21.0 203.5 Low 07:58:54 - 08:28:54 1657

Portola 08:13:52 -27.4 Dark Up 20.9 203.9 Low 07:58:52 - 08:28:52 1649

Reno 08:13:49 -27.7 Dark Up 21.0 204.5 Low 07:58:49 - 08:28:49 1633

Carson City 08:13:49 -28.0 Dark Up 21.3 204.6 Low 07:58:49 - 08:28:49 1616

Gardnerville 08:13:48 -28.3 Dark Up 21.5 204.7 Low 07:58:48 - 08:28:48 1604

Yerington 08:13:46 -28.2 Dark Up 21.3 205.2 Low 07:58:46 - 08:28:46 1603

Hawthorne 08:13:43 -28.6 Dark Up 21.5 205.7 Low 07:58:43 - 08:28:43 1577

Lee Vining 08:13:44 -29.2 Dark Up 22.2 205.4 Low 07:58:44 - 08:28:44 1554

Bishop 08:13:41 -29.8 Dark Up 22.5 206.2 Low 07:58:41 - 08:28:41 1518

Dunrhomin 08:13:03 -25.1 Dark Down 14.7 216.8 Really Low 07:58:03 - 08:28:03 1508

Nikitin 08:13:03 -25.2 Dark Down 14.9 216.8 Really Low 07:58:03 - 08:28:03 1499

CU-SBO 08:13:03 -25.3 Dark Down 15.0 216.8 Really Low 07:58:03 - 08:28:03 1498

Beatty 08:13:34 -30.1 Dark Up 22.3 207.7 Low 07:58:34 - 08:28:34 1481

Patrick 08:13:22 -31.3 Dark Up 22.5 210.5 Low 07:58:22 - 08:28:22 1376

Laughlin/Bullhead City 08:13:24 -31.6 Dark Up 23.0 209.9 Low 07:58:24 - 08:28:24 1369

Wildwood 08:13:36 -33.1 Dark Up 25.5 206.6 Low 07:58:36 - 08:28:36 1346

Lake Havasu City 08:13:22 -32.3 Dark Up 23.5 210.3 Low 07:58:22 - 08:28:22 1330

Idyllwild 08:13:29 -33.3 Dark Up 25.1 208.4 Low 07:58:29 - 08:28:29 1311

Calipatria 08:13:24 -33.8 Dark Up 25.2 209.5 Low 07:58:24 - 08:28:24 1264

George/Scottsdale 08:13:12 -32.7 Dark Down 23.1 212.6 Low 07:58:12 - 08:28:12 1259

Yuma 08:13:20 -34.1 Dark Up 25.2 210.4 Low 07:58:20 - 08:28:20 1230

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 278361, (2025/07/05 08:03UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 13.08  29
35Eta Oph      17:10:22.7 -15:43:29  2.6 10.34  38
44 Oph         17:26:22.2 -24:10:34  4.2  1.12  41
PPM 266914     17:28:38.8 -25:30:39  7.4  0.37  42
PPM 266880     17:27:00.9 -25:16:18  9.4  0.08  41
278361         17:27:21.6 -25:16:38 16.7        42
Positions are for J2000

Event circumstances last updated at 2024/03/02 06:27:27 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)
Kamloops	08:14:09	-16.6	AT	Down	10.9	202.8	Really Low	07:59:09 - 08:29:09	2038
Kelowna	08:14:05	-17.3	AT	Down	11.4	203.7	Really Low	07:59:05 - 08:29:05	2011
Peachland	08:14:05	-17.5	AT	Down	11.6	203.4	Really Low	07:59:05 - 08:29:05	2010
Summerland	08:14:05	-17.6	AT	Down	11.7	203.5	Really Low	07:59:05 - 08:29:05	2005
Penticton	08:14:05	-17.7	AT	Down	11.8	203.6	Really Low	07:59:05 - 08:29:05	2003
Oliver	08:14:04	-18.0	Dark	Down	12.1	203.6	Really Low	07:59:04 - 08:29:04	1993
Victoria	08:14:15	-18.7	Dark	Up	13.6	200.3	Really Low	07:59:15 - 08:29:15	1991
Anarchist Mountain Observatory	08:14:03	-18.2	Dark	Down	12.2	203.8	Really Low	07:59:03 - 08:29:03	1987
Okanogan	08:14:03	-18.8	Dark	Down	12.8	203.7	Really Low	07:59:03 - 08:29:03	1969
Brewster	08:14:03	-19.1	Dark	Down	13.1	203.5	Really Low	07:59:03 - 08:29:03	1961
Manson/Chelan	08:14:04	-19.3	Dark	Down	13.4	203.2	Really Low	07:59:04 - 08:29:04	1957
Sleaford	08:13:34	-13.8	AT	Down	5.4	215.0	Really Low	07:58:34 - 08:28:34	1951
Wenatchee	08:14:03	-19.8	Dark	Down	13.9	203.1	Really Low	07:59:03 - 08:29:03	1943
Ellensburg	08:14:03	-20.2	Dark	Down	14.4	203.0	Really Low	07:59:03 - 08:29:03	1931
Yakima	08:14:03	-20.6	Dark	Down	14.7	203.0	Really Low	07:59:03 - 08:29:03	1917
Toppenish/White Swan	08:14:02	-20.9	Dark	Down	14.9	203.2	Really Low	07:59:02 - 08:29:02	1909
PNWRO	08:13:57	-21.2	Dark	Down	14.8	204.5	Really Low	07:58:57 - 08:28:57	1888
The Dalles	08:14:03	-21.6	Dark	Up	15.8	202.5	Really Low	07:59:03 - 08:29:03	1886
Maupin	08:14:02	-22.1	Dark	Up	16.2	202.7	Really Low	07:59:02 - 08:29:02	1871
Sisters	08:14:02	-23.0	Dark	Up	17.1	202.3	Really Low	07:59:02 - 08:29:02	1842
Bend	08:14:01	-23.2	Dark	Up	17.3	202.6	Really Low	07:59:01 - 08:29:01	1831
Oregon Observatory	08:14:01	-23.4	Dark	Up	17.5	202.5	Really Low	07:59:01 - 08:29:01	1826
Chiloquin	08:14:01	-24.7	Dark	Up	18.8	202.3	Really Low	07:59:01 - 08:29:01	1776
Klamath Falls	08:14:00	-25.0	Dark	Up	19.1	202.4	Really Low	07:59:00 - 08:29:00	1761
Cedarville	08:13:53	-25.7	Dark	Up	19.3	203.9	Really Low	07:58:53 - 08:28:53	1723
Fall River/Burney	08:13:57	-26.2	Dark	Up	20.1	202.9	Low	07:58:57 - 08:28:57	1709
Greenville	08:13:54	-27.1	Dark	Up	20.8	203.4	Low	07:58:54 - 08:28:54	1667
Gimple	08:13:54	-27.1	Dark	Up	20.8	203.5	Low	07:58:54 - 08:28:54	1666
Quincy	08:13:54	-27.3	Dark	Up	21.0	203.5	Low	07:58:54 - 08:28:54	1657
Portola	08:13:52	-27.4	Dark	Up	20.9	203.9	Low	07:58:52 - 08:28:52	1649
Reno	08:13:49	-27.7	Dark	Up	21.0	204.5	Low	07:58:49 - 08:28:49	1633
Carson City	08:13:49	-28.0	Dark	Up	21.3	204.6	Low	07:58:49 - 08:28:49	1616
Gardnerville	08:13:48	-28.3	Dark	Up	21.5	204.7	Low	07:58:48 - 08:28:48	1604
Yerington	08:13:46	-28.2	Dark	Up	21.3	205.2	Low	07:58:46 - 08:28:46	1603
Hawthorne	08:13:43	-28.6	Dark	Up	21.5	205.7	Low	07:58:43 - 08:28:43	1577
Lee Vining	08:13:44	-29.2	Dark	Up	22.2	205.4	Low	07:58:44 - 08:28:44	1554
Bishop	08:13:41	-29.8	Dark	Up	22.5	206.2	Low	07:58:41 - 08:28:41	1518
Dunrhomin	08:13:03	-25.1	Dark	Down	14.7	216.8	Really Low	07:58:03 - 08:28:03	1508
Nikitin	08:13:03	-25.2	Dark	Down	14.9	216.8	Really Low	07:58:03 - 08:28:03	1499
CU-SBO	08:13:03	-25.3	Dark	Down	15.0	216.8	Really Low	07:58:03 - 08:28:03	1498
Beatty	08:13:34	-30.1	Dark	Up	22.3	207.7	Low	07:58:34 - 08:28:34	1481
Patrick	08:13:22	-31.3	Dark	Up	22.5	210.5	Low	07:58:22 - 08:28:22	1376
Laughlin/Bullhead City	08:13:24	-31.6	Dark	Up	23.0	209.9	Low	07:58:24 - 08:28:24	1369
Wildwood	08:13:36	-33.1	Dark	Up	25.5	206.6	Low	07:58:36 - 08:28:36	1346
Lake Havasu City	08:13:22	-32.3	Dark	Up	23.5	210.3	Low	07:58:22 - 08:28:22	1330
Idyllwild	08:13:29	-33.3	Dark	Up	25.1	208.4	Low	07:58:29 - 08:28:29	1311
Calipatria	08:13:24	-33.8	Dark	Up	25.2	209.5	Low	07:58:24 - 08:28:24	1264
George/Scottsdale	08:13:12	-32.7	Dark	Down	23.1	212.6	Low	07:58:12 - 08:28:12	1259
Yuma	08:13:20	-34.1	Dark	Up	25.2	210.4	Low	07:58:20 - 08:28:20	1230