RECON observing guide for 588_Achilles_20250620223614

Occultation event with (588) Achilles, event index number 1076
Regions able to see the event: SAmericaN

Geocentric closest approach at 2025/06/20 22:36:14 UTC

J2000 position of star is 10:36:47.9 +02:44:04
Equinox of date position of star is 10:38:06.8 +02:36:06
Star is 132 degrees from the moon. Moon is 27% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=13.8
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 55% with SNR of 5.1 for the occulted depth (per occulted point)

Apparent velocity is 23.2 km/sec on the sky relative to the star, or, 22.0 arcsec/hr.
The recommended exposure time corresponds to 4.6 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 29.5 km.
The sky-plane scale is 3791.5 km/arcsec.

Diameter estimates:
135.5 km assuming a 5% albedo, aximum of 5.8 sec for a central chord
55.3 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 135.5 km used for deployment plan.

Star training set for 588_Achilles, (2025/06/20 22:36UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.5 +11:50:30  1.3 11.61 122
30Bet Sex      10:31:35.6 -00:46:06  4.8  3.74 131
PPM 156997     10:37:20.3 +02:36:54  8.5  0.19 132
588_Achilles   10:38:06.8 +02:36:06 13.8       132
Positions are for equinox of date

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 588_Achilles, (2025/06/20 22:36UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 11.61 122
30Bet Sex      10:30:17.4 -00:38:14  4.8  3.74 131
PPM 156997     10:36:01.5 +02:44:51  8.5  0.19 132
588_Achilles   10:36:47.9 +02:44:04 13.8       132
Positions are for J2000


Created by recondetail.pro, 2025/03/15 09:50:04 MT