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2024-07-21 / G210017.9-131151 / (335) Roberta

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Ferran Casarramona O+ VID M200 ES GPS 21:18:02 21:18:45.60 21:18:58.40 21:20:01 0.16 0.40 12.80 84.5
2 show Mikhail Ashchepkau, Michel Turchenko O+ VID M150 BY PHONE 21:10:00 21:11:18.17 21:11:29.58 21:13:00 0.73 0.73 11.41 75.3
3 show Marian Urbanik O- VID T4000 SK GPS 21:12:50 21:14:45
4 show Marcin Filipek O- VID M250 PL GPS 21:13:10 21:13:40
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: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#86 : 5dbc7800-c34f-11ef-5276-0c01ff76af0f [db: observed]
JPL#86 : 5dbc9f10-c34f-11ef-5276-a3e9ff1fc0fd [db: observed]
JPL#84 : 9a8f2f60-858e-11ef-78cd-5baaf6fcf520 [db: asteroids]
JPL#84 : 9a8f2f60-858e-11ef-78cd-08823fecb4ef [db: asteroids]

Using prediction 9a8f2f60-858e-11ef-78cd-08823fecb4ef 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 = 2824.3, 343.7 km
Circular diameter = 92 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: 2024-07-21, 21:18 UT (JD = 2460513.388)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 31003.012.027 105°, 48° 2.444754e615759.40.0° None2019-06-25 100.0 +/- 11.0 km 2019-06-24
# 31013.012.027 297°, 54° 2.444754e615759.40.0° None2019-06-25 98.0 +/- 9.0 km 2019-06-24
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] : 9a8f2f60-858e-11ef-78cd-08823fecb4ef [asteroids]

 Occultation Date + Time   : 2024-07-21 at 21:14:34 UT +/- 0.02 min  [1]
 Object Designation        : (335) Roberta
 Orbit Class               : MBA
 Star Designation          : GDR3 6888490861127367040
 Star Coordinates (ICRF)   : RA = 21 00 17.8873, DE = -13 11 51.169  [2]
 Star Magnitudes           : G = 11.28 mag, RP = 10.07 mag, BP = 10.88 mag
 Object Magnitude          : V = 11.38 mag
 Estimated Magnitude Drop  : 0.8 mag
 Estimated Max. Duration   : 13.5 sec
 Object Mean Diameter      : 89 km  (src: astorb)
 Speed of the shadow       : 6.6 km/s
 Elongation to Moon & Sun  : 11° (sunlit = 100%), Sun = 165°
 Cross-track uncertainty   : 1.6 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 4.2 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#84

 
 [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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