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2020-03-22 / 4UC 570-011044 / (332) Siri

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show A. Schweizer et al O+ CCD M500 CH GPS 21:23:00 21:23:19.94 21:23:21.54 21:24:00 0.20 0.30 1.60 45.3
2 show Stefan Meister O+ CCD M360 CH GPS 21:23:01 21:23:20.15 21:23:21.60 21:24:01 0.20 0.20 1.45 41.0
3 show Peter Birtwhistle O- CCD M405 UK 21:23:04 21:23:24
4 show John Talbot O- VID M303 UK 21:21:17 21:25:14
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#65 : 7ec9ed31-0af9-49e9-83f2-063ddcad27dc [db: observed]

Using prediction 7ec9ed31-0af9-49e9-83f2-063ddcad27dc 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: 2020-03-22, 21:22 UT (JD = 2458931.390)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 51701.08.006 259°, 48° 2.45732e61611.40.0° 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] : 7ec9ed31-0af9-49e9-83f2-063ddcad27dc [observed]

 Occultation Date + Time   : 2020-03-22 at 21:20:29 UT +/- 0.01 min  [1]
 Object Designation        : (332) Siri
 Orbit Class               : MBA
 Star Designation          : GDR3 0149226993730571008
 Star Coordinates (ICRF)   : RA = 04 26 27.7976, DE = +23 53 13.559  [2]
 Star Magnitudes           : G = 13.67 mag, RP = 12.95 mag, BP = 14.22 mag
 Object Magnitude          : V = 15.45 mag
 Estimated Magnitude Drop  : 2.0 mag
 Estimated Max. Duration   : 1.4 sec
 Object Mean Diameter      : 40 km  (src: astorb)
 Speed of the shadow       : 28.3 km/s
 Elongation to Moon & Sun  : 83° (sunlit = 2%), Sun = 66°
 Cross-track uncertainty   : 1.0 mas = 2 km = 0.06 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#65

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

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