RECON observing guide for 16974_Iphthime_20250518171615

Occultation event with (16974) Iphthime, event index number 986
Regions able to see the event: SAfrica

Geocentric closest approach at 2025/05/18 17:16:15 UTC

J2000 position of star is 08:43:32.6 +03:11:27
Equinox of date position of star is 08:44:52.1 +03:05:53
Star is 161 degrees from the moon. Moon is 69% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 5.9 per integration for unocculted signal
Expected flux drop is 58% with SNR of 3.4 for the occulted depth (per occulted point)

Apparent velocity is 20.8 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
The recommended exposure time corresponds to 14.5 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 16.7 km.
The sky-plane scale is 4012.0 km/arcsec.

Diameter estimates:
62.0 km assuming a 5% albedo, aximum of 3.0 sec for a central chord
25.3 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 62.0 km used for deployment plan.

Star training set for 16974_Iphthime, (2025/05/18 17:16UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:43.3 +11:50:32  1.3 22.76 156
Alphard        09:28:50.1 -08:46:11  2.0 16.15 147
7Eta Hya       08:44:33.1 +03:18:20  4.0  0.22 161
PPM 154936     08:46:32.1 +04:08:07  8.5  1.12 162
PPM 154918     08:45:29.3 +02:58:12  8.9  0.20 161
16974_Iphthime 08:44:52.1 +03:05:53 15.8       161
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 16974_Iphthime, (2025/05/18 17:16UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 22.76 156
Alphard        09:27:35.2 -08:39:30  2.0 16.15 147
7Eta Hya       08:43:13.6 +03:23:53  4.0  0.22 161
PPM 154936     08:45:12.2 +04:13:43  8.5  1.12 162
PPM 154918     08:44:09.9 +03:03:47  8.9  0.20 161
16974_Iphthime 08:43:32.6 +03:11:27 15.8       161
Positions are for J2000


Created by recondetail.pro, 2025/03/15 08:35:58 MT