Occultation event with (5264) Telephus, event index number 849
Regions able to see the event: US
Geocentric closest approach at 2025/03/24 07:25:38 UTC
J2000 position of star is 09:21:04.8 +31:43:51
Equinox of date position of star is 09:22:35.6 +31:37:22
Star is 160 degrees from the moon. Moon is 32% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
Expected flux drop is 70% with SNR of 9.9 per integration
Apparent velocity is 7.5 km/sec on the sky relative to the star, or, 9.3 arcsec/hr.
The recommended exposure time corresponds to 12.7 km per image.
The 1-sigma error in the time of the event is 3.9 seconds.
The 1-sigma cross-track error in the shadow position is 38.4 km.
The sky-plane scale is 2894.0 km/arcsec.
Diameter estimates:
76.2 km assuming a 5% albedo, aximum of 10.2 sec for a central chord
31.1 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 76.2 km used for deployment plan.
Star training set for 5264_Telephus, (2025/03/24 07:26UT) Object RA Dec mag sep mel Pollux 07:46:51.4 +27:57:47 1.1 21.05 177 40Alp Lyn 09:22:35.1 +34:17:04 3.1 2.66 159 PPM 074436 09:23:10.4 +32:09:19 7.1 0.55 160 PPM 074442 09:23:45.1 +31:47:22 9.4 0.30 160 5264_Telephus 09:22:35.6 +31:37:22 14.3 160 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 3.0 % 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| RIT | 07:20:56 | -37.4 | Dark | Down | 31.8 | 285.5 | Up | 07:17:30-07:23:30 | -105.5 | 0.030 | Ryan Obs | 07:20:12 | -39.2 | Dark | Down | 30.0 | 288.0 | Up | 07:17:15-07:23:15 | -140.4 | 0.003 |
Star training set for 5264_Telephus, (2025/03/24 07:26UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 21.05 177 40Alp Lyn 09:21:02.9 +34:23:34 3.1 2.66 159 PPM 074436 09:21:39.3 +32:15:50 7.1 0.55 160 PPM 074442 09:22:14.3 +31:53:54 9.4 0.30 160 5264_Telephus 09:21:04.8 +31:43:51 14.3 160 Positions are for J2000