Collaborative Occultation Resources and Archive (CORA)

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

2022-01-03 / 4UC 641-045146 / (746) Marlu

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Joan Rovira O+ VID M250 ES GPS++ 02:59:00 03:01:42.07 03:01:47.75 03:05:30 0.08 0.08 5.68 84.1
2 show Antoni Selva O+ VID M200 ES GPS++ 02:59:46 03:01:46.21 03:01:50.69 03:03:45 0.32 0.32 4.48 66.3
3 show Mike Skrutskie O- CCD M200 US 03:06:58 03:11:34
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

3 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#118 : d764d253-4522-4f63-beec-3e577483a829 [db: observed]
JPL#118 : 38baa96d-fdbb-4897-af80-b20baa160b41 [db: observed]

Using prediction d764d253-4522-4f63-beec-3e577483a829 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 = -360.8, 8.3 km
Circular diameter = 86 km

From 2 chords (VID)








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: 2022-01-03, 03:00 UT (JD = 2459582.625)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 1148None7.789 202°, -66° 2.444854e614728.60.0° NoneNone not scaled 2016-01-04
# 1149None7.789 64°, -27° 2.444854e614728.60.0° NoneNone not scaled 2016-01-04
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] : d764d253-4522-4f63-beec-3e577483a829 [observed]

 Occultation Date + Time   : 2022-01-03 at 03:02:49 UT +/- 0.01 min  [1]
 Object Designation        : (746) Marlu
 Orbit Class               : MBA
 Star Designation          : GDR3 0718813668054886400
 Star Coordinates (ICRF)   : RA = 09 00 59.9130, DE = +38 07 33.002  [2]
 Star Magnitudes           : G = 13.13 mag, RP = 12.68 mag, BP = 13.42 mag
 Object Magnitude          : V = 15.81 mag
 Estimated Magnitude Drop  : 2.8 mag
 Estimated Max. Duration   : 4.7 sec
 Object Mean Diameter      : 70 km  (src: astorb)
 Speed of the shadow       : 14.8 km/s
 Elongation to Moon & Sun  : 155° (sunlit = 0%), Sun = 149°
 Cross-track uncertainty   : 2.7 mas = 5 km = 0.08 path-width (1-sig)
 RUWE and duplicate source : 1.12 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#118

 
 [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)