Collaborative Occultation Resources and Archive (CORA)

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

1999-12-22 / TYC 1887-00862-1 / (257) Silesia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Pierre Jonquet O+ VIS M280 FR 05:28:00 05:36:00
2 show Jean Lecacheux O+ VIS B80 FR GPS+ 05:27:47 05:31:53.21 05:31:59.19 05:33:52 0.34 0.12 5.98 68.8
3 show Francois Colas O+ VIS M200 FR GPS+ 05:22:00 05:31:52.8 05:31:59.4 05:37:00 0.3 0.3 6.60 75.9
4 show Jean Montanne O- CCD M200 FR
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

4 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#63 : 27f48b87-00e7-4b25-b4bc-00eae9890b6f [db: observed]

Using prediction 27f48b87-00e7-4b25-b4bc-00eae9890b6f 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 = -435.0, -26.5 km
Circular diameter = 104 km

From 2 chords (VIS)








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: 1999-12-22, 05:30 UT (JD = 2451534.729)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 702None15.710 5°, -53° 2.451027e6507.70.0° NoneNone not scaled 2013-02-11
# 703None15.710 176°, -46° 2.451027e6507.70.0° NoneNone not scaled 2013-02-11
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] : 27f48b87-00e7-4b25-b4bc-00eae9890b6f [observed]

 Occultation Date + Time   : 1999-12-22 at 05:37:53 UT +/- 0.06 min  [1]
 Object Designation        : (257) Silesia
 Orbit Class               : MBA
 Star Designation          : GDR3 3434082333203959424
 Star Coordinates (ICRF)   : RA = 06 33 04.9030, DE = +28 04 54.570  [2]
 Star Magnitudes           : G = 7.94 mag, RP = 7.79 mag, BP = 8.01 mag
 Object Magnitude          : V = 13.59 mag
 Estimated Magnitude Drop  : 5.7 mag
 Estimated Max. Duration   : 6.3 sec
 Object Mean Diameter      : 73 km  (src: astorb)
 Speed of the shadow       : 11.5 km/s
 Elongation to Moon & Sun  : 17° (sunlit = 100%), Sun = 171°
 Cross-track uncertainty   : 1.1 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#63

 
 [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)