RECON observing guide for 7119_Hiera_20260523115444

Occultation event with (7119) Hiera, event index number 3760
Regions able to see the event: Australia

Geocentric closest approach at 2026/05/23 11:54:44 UTC

J2000 position of star is 10:30:31.0 -11:24:37
Equinox of date position of star is 10:31:49.5 -11:32:46
Star is 22 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.55 seconds with the standard RECON-QHY system.
SNR of 4.2 per integration for unocculted signal
Expected flux drop is 30% with SNR of 1.3 for the occulted depth (per occulted point)

Apparent velocity is 9.4 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
Position angle of asteroid motion is 62.0 degrees
The recommended exposure time corresponds to 14.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 36.8 km.
The sky-plane scale is 3707.2 km/arcsec.

Diameter estimates:
66.4 km assuming a 5% albedo, maximum of 7.1 sec for a central chord
27.1 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 59.2 km used for deployment plan.

Star training set for 7119_Hiera, (2026/05/23 11:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:09:46.5 +11:50:14  1.3 24.02   3
Alphard        09:28:53.1 -08:46:27  2.0 15.73  23
PPM 223198     10:37:51.3 -12:22:20  5.7  1.69  23
PPM 223086     10:33:20.0 -11:33:41  7.9  0.37  22
PPM 223047     10:31:38.4 -11:42:13  9.2  0.16  22
7119_Hiera     10:31:49.5 -11:32:46 15.5        22
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 7119_Hiera, (2026/05/23 11:55UT)
Object            RA         Dec     mag  sep  mel
Regulus        10:08:21.9 +11:58:02  1.3 24.02   3
Alphard        09:27:35.2 -08:39:30  2.0 15.73  23
PPM 223198     10:36:32.9 -12:14:06  5.7  1.69  23
PPM 223086     10:32:01.5 -11:25:30  7.9  0.37  22
PPM 223047     10:30:20.0 -11:34:04  9.2  0.16  22
7119_Hiera     10:30:31.0 -11:24:37 15.5        22
Positions are for J2000


Created by recondetail.pro, 2025/06/19 14:18:45 MT