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2023-08-27 / UCAC4 406-090327 / (1330) Spiridonia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Ferran Casarramona O+ VID M200 ES GPS 21:38:02 21:40:12.9 21:40:18.1 21:42:02 1.3 1.3 5.20 43.2
2 show Olivier Schreurs, Esteban Fernandez'Pelaez O+ VID M410 BE GPS 21:37:25 21:38:22.50 21:38:28.80 21:39:26 0.4 0.5 6.30 52.3
3 show Roland BONINSEGNA O- VID M400 BE GPS 21:37:33 21:39:32
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: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#60 : 7b834675-e766-474e-ac58-3d9ea92cb9c1 [db: observed]

Using prediction 7b834675-e766-474e-ac58-3d9ea92cb9c1 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 = -590.8, 25.3 km
Circular diameter = 54 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: 2023-08-27, 21:40 UT (JD = 2460184.403)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 45591.09.626 341°, 5° 2.457401e62783.40.0° None2020-10-05 not scaled 2019-10-23
# 45601.09.626 158°, 8° 2.457401e62783.40.0° 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] : 7b834675-e766-474e-ac58-3d9ea92cb9c1 [observed]

 Occultation Date + Time   : 2023-08-27 at 21:49:43 UT +/- 0.17 min  [1]
 Object Designation        : (1330) Spiridonia
 Orbit Class               : MBA
 Star Designation          : GDR3 4251447702453387648
 Star Coordinates (ICRF)   : RA = 18 46 42.4621, DE = -08 58 56.250  [2]
 Star Magnitudes           : G = 15.37 mag, RP = 14.33 mag, BP = 16.49 mag
 Object Magnitude          : V = 15.75 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 6.7 sec
 Object Mean Diameter      : 56 km  (src: astorb)
 Speed of the shadow       : 8.3 km/s
 Elongation to Moon & Sun  : 21° (sunlit = 86%), Sun = 126°
 Cross-track uncertainty   : 0.8 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#60

 
 [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
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