RECON: TNO occultation with 248835

Event between (248835) 06SX368 and star UC4-653-027693 with event index number of 212527

Geocentric closest approach at 2019/09/27 10:48:42 UTC

J2000 position of star is 05:02:58.1 +40:25:32
Equinox of date position of star is 05:04:13.8 +40:27:00
Stellar brightness R=15.1, use SENSEUP=128
Star is 85 degrees from the moon. Moon is 3% illuminated.
TNO apparent brightness V=21.8

[RECON map]
TNO is 16.1 AU from the Sun and 15.8 AU from the Earth.
The TNO is moving 4.8 km/sec on the sky relative to the star, or, 1.5 arcsec/hr.
The 1-sigma error in the time of the event is 598 seconds.
The 1-sigma cross-track error in the shadow position is 2491 km.
The sky-plane scale is 11451.6 km/arcsec.

The TNO has an absolute magnitude Hv=9.5
Diameter=75.9 km assuming a 5% albedo -- 16.0 sec chord
Diameter=31.0 km assuming a 30% albedo -- 6.5 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 

Star training set for 248835, (2019/09/27 10:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:03.3 +16:32:51  0.8 24.62  96
3Iot Aur       04:58:16.9 +33:11:44  2.7  7.36  88
8Zet Aur       05:03:51.7 +41:06:10  3.8  0.66  85
PPM 047655     05:04:29.8 +40:34:46  7.9  0.13  85
248835         05:04:20.6 +40:27:08 15.1        85
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 16.7 km RECON observability=1.0 and success probability=12.6%
Site Site mid-time
(UT)
Sun alt
(deg)
Sky Moon Star alt
(deg)
Star az
(deg)
Target Observing Time
(UT)
X-track
(km)
Niwot 10:50:12 -23.9 Dark Down 80.5 84.1 Up 10:35:12 - 11:05:12 2442
Oroville 10:55:15 -28.2 Dark Down 70.1 105.8 Up 10:40:15 - 11:10:15 2389
Tonasket 10:55:08 -28.3 Dark Down 70.2 105.1 Up 10:40:08 - 11:10:08 2369
Okanogan 10:55:07 -28.6 Dark Down 70.2 104.0 Up 10:40:07 - 11:10:07 2333
Brewster 10:55:05 -28.9 Dark Down 70.1 103.1 Up 10:40:05 - 11:10:05 2300
Manson/Chelan 10:55:05 -29.2 Dark Down 69.9 102.1 Up 10:40:05 - 11:10:05 2266
Entiat 10:55:05 -29.4 Dark Down 69.9 101.4 Up 10:40:05 - 11:10:05 2243
Wenatchee 10:55:02 -29.6 Dark Down 69.9 100.6 Up 10:40:02 - 11:10:02 2217
Pasco 10:54:30 -29.6 Dark Down 70.8 98.5 Up 10:39:30 - 11:09:30 2171
Ellensburg 10:54:58 -29.9 Dark Down 69.8 99.2 Up 10:39:58 - 11:09:58 2170
PNWRO 10:54:24 -29.6 Dark Down 71.0 98.0 Up 10:39:24 - 11:09:24 2160
Yakima 10:54:52 -30.2 Dark Down 69.8 98.1 Up 10:39:52 - 11:09:52 2134
George/Umatilla 10:54:30 -29.9 Dark Down 70.7 97.4 Up 10:39:30 - 11:09:30 2132
Toppenish/White Swan 10:54:47 -30.2 Dark Down 70.0 97.7 Up 10:39:47 - 11:09:47 2123
Goldendale 10:54:45 -30.8 Dark Down 69.7 95.8 Up 10:39:45 - 11:09:45 2055
The Dalles 10:54:45 -31.1 Dark Down 69.5 94.8 Up 10:39:45 - 11:09:45 2019
Maupin 10:54:38 -31.3 Dark Down 69.6 93.8 Up 10:39:38 - 11:09:38 1987
Madras/Culver 10:54:31 -31.7 Dark Down 69.6 92.3 Up 10:39:31 - 11:09:31 1937
Redmond 10:54:28 -31.9 Dark Down 69.5 91.3 Up 10:39:28 - 11:09:28 1904
Sisters 10:54:32 -32.1 Dark Down 69.2 91.0 Up 10:39:32 - 11:09:32 1887
Bend 10:54:26 -32.1 Dark Down 69.4 90.6 Up 10:39:26 - 11:09:26 1878
Oregon Observatory 10:54:25 -32.3 Dark Down 69.3 90.0 Up 10:39:25 - 11:09:25 1857
La Pine/Gilchrist 10:54:23 -32.4 Dark Down 69.3 89.4 Up 10:39:23 - 11:09:23 1836
North Lake 10:54:10 -32.4 Dark Down 69.7 88.6 Up 10:39:10 - 11:09:10 1827
Paisley 10:53:58 -32.5 Dark Down 69.9 87.3 Up 10:38:58 - 11:08:58 1796
Lakeview 10:53:47 -32.7 Dark Down 69.9 86.0 Up 10:38:47 - 11:08:47 1762
Chiloquin 10:54:09 -33.3 Dark Down 68.9 86.3 Up 10:39:09 - 11:09:09 1723
Cedarville 10:53:37 -32.9 Dark Down 70.0 84.3 Up 10:38:37 - 11:08:37 1714
Klamath Falls 10:54:03 -33.5 Dark Down 68.9 85.4 Up 10:39:03 - 11:09:03 1697
Tulelake 10:53:56 -33.5 Dark Down 69.1 84.8 Up 10:38:56 - 11:08:56 1688
Fall River/Burney 10:53:45 -33.9 Dark Down 69.0 82.5 Up 10:38:45 - 11:08:45 1613
Susanville 10:53:25 -33.8 Dark Down 69.5 81.1 Up 10:38:25 - 11:08:25 1595
Tonopah 10:52:07 -32.9 Dark Down 71.3 75.2 Up 10:37:07 - 11:07:07 1576
DCO 10:50:30 -31.5 Dark Down 73.1 65.6 Up 10:35:30 - 11:05:30 1570
Reno 10:53:04 -33.8 Dark Down 69.9 79.0 Up 10:38:04 - 11:08:04 1563
Gimple 10:53:25 -34.1 Dark Down 69.2 80.3 Up 10:38:25 - 11:08:25 1561
Greenville 10:53:25 -34.2 Dark Down 69.2 80.3 Up 10:38:25 - 11:08:25 1557
Portola 10:53:13 -34.1 Dark Down 69.5 79.5 Up 10:38:13 - 11:08:13 1553
Patrick 10:50:43 -31.9 Dark Down 72.8 66.8 Up 10:35:43 - 11:05:43 1552
Yerington 10:52:45 -33.7 Dark Down 70.2 77.6 Up 10:37:45 - 11:07:45 1550
Indian Springs 10:51:25 -32.6 Dark Down 71.9 70.8 Up 10:36:25 - 11:06:25 1540
Quincy 10:53:21 -34.3 Dark Down 69.1 79.7 Up 10:38:21 - 11:08:21 1540
Hawthorne 10:52:32 -33.6 Dark Down 70.5 76.4 Up 10:37:32 - 11:07:32 1539
Henderson 10:51:08 -32.4 Dark Down 72.2 69.1 Up 10:36:08 - 11:06:08 1537
Carson City 10:52:56 -34.0 Dark Down 69.8 78.0 Up 10:37:56 - 11:07:56 1534
Kingman/Dolan Springs 10:50:43 -32.1 Dark Down 72.5 66.3 Up 10:35:43 - 11:05:43 1524
Gardnerville 10:52:52 -34.1 Dark Down 69.8 77.4 Up 10:37:52 - 11:07:52 1516
Beatty 10:51:43 -33.2 Dark Down 71.3 71.9 Up 10:36:43 - 11:06:43 1506
Searchlight/Boulder City 10:50:57 -32.6 Dark Down 72.0 67.4 Up 10:35:57 - 11:05:57 1495
Laughlin/Bullhead City 10:50:49 -32.5 Dark Down 72.1 66.4 Up 10:35:49 - 11:05:49 1491
Mohave Valley 10:50:44 -32.6 Dark Down 72.0 65.7 Up 10:35:44 - 11:05:44 1470
Lee Vining 10:52:34 -34.2 Dark Down 69.9 74.9 Up 10:37:34 - 11:07:34 1466
Bishop 10:52:13 -34.0 Dark Down 70.3 73.3 Up 10:37:13 - 11:07:13 1455
Lake Havasu City 10:50:36 -32.6 Dark Down 72.0 64.4 Up 10:35:36 - 11:05:36 1453
Parker 10:50:27 -32.8 Dark Down 71.9 63.5 Up 10:35:27 - 11:05:27 1427
Lone Pine 10:51:56 -34.2 Dark Down 70.2 71.2 Up 10:36:56 - 11:06:56 1411
Blythe 10:50:25 -33.2 Dark Down 71.4 62.2 Up 10:35:25 - 11:05:25 1368
Yuma 10:50:12 -33.6 Dark Down 70.9 59.9 Up 10:35:12 - 11:05:12 1294
Calipatria 10:50:27 -34.1 Dark Down 70.5 61.5 Up 10:35:27 - 11:05:27 1275
Idyllwild 10:50:55 -34.7 Dark Down 70.0 63.6 Up 10:35:55 - 11:05:55 1254
Wildwood 10:51:26 -35.8 Dark Down 68.8 65.2 Up 10:36:26 - 11:06:26 1177
CPSLO 10:52:12 -36.6 Dark Down 67.9 68.4 Up 10:37:12 - 11:07:12 1165

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 248835, (2019/09/27 10:49UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.3 +16:30:30  0.8 24.62  96
3Iot Aur       04:56:59.6 +33:09:58  2.7  7.36  88
8Zet Aur       05:02:28.7 +41:04:33  3.8  0.66  85
PPM 047655     05:03:07.2 +40:33:10  7.9  0.13  85
248835         05:02:58.1 +40:25:32 15.1        85
Positions are for J2000

Event circumstances last updated at 2018/02/15 18:05:48 UT

Marc W. Buie, Southwest Research Institute

RECON