RECON observing guide for 12714_Alkimos_20250515015534

Occultation event with (12714) Alkimos, event index number 972
Regions able to see the event: US

Geocentric closest approach at 2025/05/15 01:55:34 UTC

J2000 position of star is 09:48:06.1 +06:38:25
Equinox of date position of star is 09:49:26.3 +06:31:17
Star is 113 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 67% with SNR of 6.7 for the occulted depth (per occulted point)

Apparent velocity is 11.2 km/sec on the sky relative to the star, or, 11.2 arcsec/hr.
The recommended exposure time corresponds to 10.6 km per image.
The 1-sigma error in the time of the event is 4.3 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 3612.9 km/arcsec.

Diameter estimates:
53.0 km assuming a 5% albedo, aximum of 4.7 sec for a central chord
21.6 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 53.0 km used for deployment plan.

Star training set for 12714_Alkimos, (2025/05/15 01:56UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.2 +11:50:32  1.3  7.30 111
PPM 156172     09:47:30.2 +06:35:25  5.8  0.49 113
PPM 156181     09:48:22.5 +06:58:20  7.9  0.52 113
PPM 156198     09:48:58.6 +06:42:03  8.6  0.21 113
12714_Alkimos  09:49:26.3 +06:31:17 15.8       113
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 1.9 % 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
NSmith 01:58:16 -15.1 AT Down 50.4 231.5 Up 01:55:21-02:01:21 75.8 0.019

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 12714_Alkimos, (2025/05/15 01:56UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3  7.30 111
PPM 156172     09:46:10.1 +06:42:30  5.8  0.49 113
PPM 156181     09:47:02.2 +07:05:26  7.9  0.52 113
PPM 156198     09:47:38.4 +06:49:10  8.6  0.21 113
12714_Alkimos  09:48:06.1 +06:38:25 15.8       113
Positions are for J2000


Created by recondetail.pro, 2025/03/14 11:19:03 MT