Collaborative Occultation Resources and Archive (CORA)

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

2018-11-09 / 4UC 435-115475 / (409) Aspasia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Michel Boutet O+1 VID M300 FR GPS++ 20:36:36 20:38:09.82 20:38:17.42 20:42:40 0.24 0.16 7.60 130.0
2 show Michel Boutet O+2 VID M300 FR GPS++ 20:36:36 20:38:45.98 20:38:56.54 20:42:40 0.72 1.04 10.56 180.6
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#124 : 2f99751c-e7c5-4b94-86b5-a25005cc1b17 [db: observed]

Using prediction 2f99751c-e7c5-4b94-86b5-a25005cc1b17 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:
Circular profile fit was not successful ...








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: 2018-11-09, 20:37 UT (JD = 2458432.359)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 215None9.021 3°, 30° 2.44431e614122.40.0° None2011-04-11 173.0 +/- 17.0 km 2011-03-28
# 7154.09.021 4°, 29° 2.44431e614122.40.0° None2017-06-19 164.0 +/- 3.0 km 2017-06-19
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] : 2f99751c-e7c5-4b94-86b5-a25005cc1b17 [observed]

 Occultation Date + Time   : 2018-11-09 at 20:35:19 UT +/- 0.01 min  [1]
 Object Designation        : (409) Aspasia
 Orbit Class               : MBA
 Star Designation          : GDR3 2685347801252967168
 Star Coordinates (ICRF)   : RA = 21 15 05.8698, DE = -03 06 18.973  [2]
 Star Magnitudes           : G = 12.61 mag, RP = 11.86 mag, BP = 12.69 mag
 Object Magnitude          : V = 12.57 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 9.5 sec
 Object Mean Diameter      : 162 km  (src: astorb)
 Speed of the shadow       : 17.1 km/s
 Elongation to Moon & Sun  : 66° (sunlit = 5%), Sun = 93°
 Cross-track uncertainty   : 3.9 mas = 6 km = 0.04 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#124

 Object is a Gaia mass determination target !

 [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)