RECON observing guide for 4836_Medon_20260413083301

Occultation event with (4836) Medon, event index number 3625
Regions able to see the event: US,RECON,UVa

Geocentric closest approach at 2026/04/13 08:33:01 UTC

J2000 position of star is 13:41:40.6 +12:32:57
Equinox of date position of star is 13:42:58.1 +12:25:02
Star is 128 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 58% with SNR of 5.4 for the occulted depth (per occulted point)

Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
Position angle of asteroid motion is 103.3 degrees
The recommended exposure time corresponds to 5.0 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 26.6 km.
The sky-plane scale is 2997.3 km/arcsec.

Diameter estimates:
74.1 km assuming a 5% albedo, maximum of 4.4 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 63.3 km used for deployment plan.

Star training set for 4836_Medon, (2026/04/13 08:33UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:51.7 +19:02:49  0.0 10.51 120
Vindemiatrix   13:03:29.1 +10:49:06  2.8  9.80 138
PPM 129981     13:40:52.4 +10:36:49  5.8  1.88 128
PPM 129995     13:42:03.0 +14:00:12  8.3  1.60 128
PPM 129986     13:41:17.3 +12:27:17  9.8  0.41 128
PPM 130006     13:43:14.8 +12:09:32 11.1  0.27 128
4836_Medon     13:42:58.1 +12:25:02 14.3       128
Positions are for equinox of date

This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 25.9 % chance of getting at least one chord. There is a 0.6% chance of 2 or more chords assuming clear weather for all.
Site Name Site mid-time
(UT)		 Sun alt
(deg)		 Sky Moon Star alt
(deg)		 Star az
(deg)		 Target Observing Time Xtrack
(km)		 Prob
Naylor Obs 08:30:06 -22.2 Dark Down 40.6 249.6 Up 08:28:49-08:34:49 100.5 0.002
Ryan Obs 08:30:03 -22.0 Dark Up 40.3 250.3 Up 08:27:27-08:33:27 92.7 0.006
Getrost 08:30:27 -24.7 Dark Down 43.8 244.1 Up 08:27:59-08:33:59 44.3 0.256

This table contains the target star visibility for registered RECON sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 71.4 % chance of getting at least one chord. There is a 3.2% chance of 2 or more chords assuming clear weather for all.
Site Name Site mid-time
(UT)		 Sun alt
(deg)		 Sky Moon Star alt
(deg)		 Star az
(deg)		 Target Observing Time Xtrack
(km)		 Prob
Kamloops 08:33:26 -29.8 Dark Down 51.7 186.5 Up 08:30:20-08:36:20 -11.8 0.641
Kelowna 08:33:21 -30.5 Dark Down 52.5 188.0 Up 08:30:21-08:36:21 -64.8 0.080
Peachland 08:33:22 -30.7 Dark Down 52.6 187.6 Up 08:30:21-08:36:21 -79.3 0.025
Summerland 08:33:21 -30.8 Dark Down 52.7 187.8 Up 08:30:21-08:36:21 -90.3 0.009
Penticton 08:33:21 -30.9 Dark Down 52.8 187.9 Up 08:30:19-08:36:19 -94.0 0.006
Oliver 08:33:20 -31.2 Dark Down 53.1 188.0 Up 08:30:12-08:36:12 -124.1 0.000
Anarchist Mountain Observatory 08:33:19 -31.4 Dark Down 53.3 188.3 Up 08:30:22-08:36:22 -134.9 0.000
Okanogan 08:33:19 -32.0 Dark Down 54.0 188.1 Up 08:30:21-08:36:21 -194.5 0.000

This table contains the target star visibility for registered UVa sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 8.5 % chance of getting at least one chord. There is a 0.3% chance of 2 or more chords assuming clear weather for all.
Site Name Site mid-time
(UT)		 Sun alt
(deg)		 Sky Moon Star alt
(deg)		 Star az
(deg)		 Target Observing Time Xtrack
(km)		 Prob
Culpeper 08:30:03 -23.9 Dark Down 42.0 250.0 Up 08:27:03-08:33:03 -64.0 0.085
Lake_Anna 08:30:01 -24.1 Dark Down 42.1 250.4 Up 08:27:03-08:33:03 -99.2 0.003
Charlottesville 08:30:03 -24.4 Dark Down 42.5 249.9 Up 08:27:01-08:33:01 -112.9 0.001
Crozet 08:30:03 -24.5 Dark Down 42.6 249.7 Up 08:27:03-08:33:03 -113.7 0.001
Green_Bank 08:30:09 -25.1 Dark Down 43.4 248.4 Up 08:27:02-08:33:02 -115.5 0.001
Richmond 08:29:57 -24.0 Dark Down 41.9 251.2 Up 08:27:09-08:33:09 -122.8 0.000
Lynchburg 08:30:02 -25.2 Dark Down 43.2 249.9 Up 08:26:57-08:32:57 -183.4 0.000

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. 

Star training set for 4836_Medon, (2026/04/13 08:33UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:37.7 +19:10:06  0.0 10.51 120
Vindemiatrix   13:02:10.1 +10:57:33  2.8  9.80 138
PPM 129981     13:39:34.4 +10:44:46  5.8  1.88 128
PPM 129995     13:40:45.9 +14:08:08  8.3  1.60 128
PPM 129986     13:39:59.8 +12:35:14  9.8  0.41 128
PPM 130006     13:41:57.3 +12:17:27 11.1  0.27 128
4836_Medon     13:41:40.6 +12:32:57 14.3       128
Positions are for J2000

Created by recondetail.pro, 2025/06/19 10:00:57 MT