Collaborative Occultation Resources and Archive (CORA)

Occultations | Observations | Reports | Info + Credits | JOA | Admin | Login

2024-07-31 / UCAC4 497-087533 / (754) Malabar

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Javier Prat, Pedro Martorell O+ CCD M310 ES GPS 23:07:09 23:09:03.334 23:09:10.836 23:11:09 0.27 0.27 7.50 95.2
2 show Anna Marciniak O+ CCD M350 PL GPS 23:06:56 23:07:26.100 23:07:30.600 23:11:00 0.8 0.8 4.50 57.1
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

2 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#129 : 55d63150-c352-11ef-5276-649fdffb288b [db: observed]
JPL#127 : 54acd5e0-8630-11ef-78cd-3711f2e75558 [db: asteroids]

Using prediction 55d63150-c352-11ef-5276-649fdffb288b for map and profile fit

Get observations as KML file (reduced site location resolution)

Ellipse and circular profile fits to the timings (chords)

 Auto-Fit Result:
X0,Y0 = 1072.8, 28.8 km
Circular diameter = 101 km

From 2 chords (CCD)








You can enter space separated chord numbers (example: 11 4 8) or a method like VIS to ignore all visual timings, or a time source like RAD and NTP (but not GPS).
If the plot disappears, then there are less than 2 chords left (too much ignored, go back with browser).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2024-07-31, 23:08 UT (JD = 2460523.464)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 57331.011.737 334°, -38° 2.457251e63272.50.0° None2020-10-05 not scaled 2019-10-23
Q: model quality flag (0-5, 5=highest) | P: rotation period | λ,β: ecl. lon. and lat. of spin axis (J2000) | JD: initial time (epoch) | φ0: initial rotation angle for JD0

 
Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : 55d63150-c352-11ef-5276-649fdffb288b [observed]

 Occultation Date + Time   : 2024-07-31 at 23:13:38 UT +/- 0.01 min  [1]
 Object Designation        : (754) Malabar
 Orbit Class               : MBA
 Star Designation          : GDR3 4479696558136726912
 Star Coordinates (ICRF)   : RA = 18 35 27.2683, DE = +09 14 54.589  [2]
 Star Magnitudes           : G = 14.12 mag, RP = 13.28 mag, BP = 14.86 mag
 Object Magnitude          : V = 14.34 mag
 Estimated Magnitude Drop  : 0.9 mag
 Estimated Max. Duration   : 6.9 sec
 Object Mean Diameter      : 88 km  (src: astorb)
 Speed of the shadow       : 12.7 km/s
 Elongation to Moon & Sun  : 141° (sunlit = 13%), Sun = 138°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.06 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#129

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia
(If error 404: link not valid which means no data available)

Aladin Sky Atlas
Aladin Lite direct link (has Gaia overlay)