RECON observing guide for 4833_Meges_20260310015339

Occultation event with (4833) Meges, event index number 3387
Regions able to see the event: US,UVa,NMexico

Geocentric closest approach at 2026/03/10 01:53:39 UTC

J2000 position of star is 11:39:00.1 +42:07:22
Equinox of date position of star is 11:40:23.4 +41:58:39
Star is 92 degrees from the moon. Moon is 63% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 15% with SNR of 0.5 for the occulted depth (per occulted point)

Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
Position angle of asteroid motion is 120.1 degrees
The recommended exposure time corresponds to 19.6 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 28.3 km.
The sky-plane scale is 3453.1 km/arcsec.

Diameter estimates:
93.8 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
38.3 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 80.2 km used for deployment plan.

Star training set for 4833_Meges, (2026/03/10 01:54UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:45.8 +11:50:18  1.3 36.03  95
Phad           11:55:11.8 +53:32:57  2.4 11.83  97
59 UMa         11:39:43.8 +43:28:48  5.8  1.51  93
PPM 052599     11:44:59.9 +41:34:37  7.4  0.95  91
PPM 052559     11:40:22.8 +42:11:12  9.1  0.21  92
PPM 052567     11:41:07.6 +42:05:26 11.0  0.18  92
4833_Meges     11:40:23.4 +41:58:39 14.5        92
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 30.9 % chance of getting at least one chord. There is a 0.0% 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
Hodapp 01:58:34 -19.8 Dark Down 33.0 57.9 Up 01:54:27-02:00:27 211.4 0.000
NSmith 01:57:59 -27.9 Dark Down 41.3 61.6 Up 01:54:25-02:00:25 48.6 0.309

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 0.0 % chance of getting at least one chord. There is a 0.0% 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
Lake_Anna 01:57:31 -32.5 Dark Down 48.1 66.2 Up 01:54:36-02:00:36 213.5 0.000
Lynchburg 01:57:36 -31.9 Dark Down 46.9 65.3 Up 01:54:38-02:00:38 169.1 0.000
Richmond 01:57:29 -33.1 Dark Down 48.2 65.9 Up 01:54:29-02:00:29 156.8 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 4833_Meges, (2026/03/10 01:54UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 36.03  95
Phad           11:53:50.1 +53:41:41  2.4 11.83  97
59 UMa         11:38:20.2 +43:37:30  5.8  1.51  93
PPM 052599     11:43:37.2 +41:43:20  7.4  0.95  91
PPM 052559     11:38:59.4 +42:19:55  9.1  0.21  92
PPM 052567     11:39:44.4 +42:14:09 11.0  0.18  92
4833_Meges     11:39:00.1 +42:07:22 14.5        92
Positions are for J2000


Created by recondetail.pro, 2025/06/19 01:45:53 MT