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2025-04-11 / UCAC4 577-041321 / (364) Isara

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Michael Kohl O+ VID M200 CH GPS 22:00:15 22:00:58.390 22:00:59.940 22:01:31 0.100 0.100 1.55 25.6
2 show Andreas Schweizer O+ VID M250 CH GPS 22:00:28 22:00:57.235 22:00:59.003 22:01:28 0.076 0.076 1.77 29.2
3 show Jonas Schenker, Josef Kaeser O+ VID T450 CH GPS 22:00:37 22:00:55.88 22:00:57.53 22:01:20 0.03 0.02 1.65 27.2
4 show Malcolm Jennings O+ VID M276 GB GPS 21:58:0. 22:00:17.99 22:00:19.84 22:02:0. 0.03 0.03 1.85 30.5
5 show Tim Haymes O+ CCD M280 GB GPS 21:59:00 22:00:12.04 22:00:13.50 22:01:20 0.10 0.12 1.46 24.1
6 show Derrick Ward O- VID M200 GB NTP 21:58:13 22:02:13
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

6 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#101 : 228aeaa0-8597-11ef-78cd-a4906ffb4610 [db: asteroids]

Using prediction 228aeaa0-8597-11ef-78cd-a4906ffb4610 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:
Size = 37 x 20 km
a',b' = 18.7, 10.0 km
X0,Y0 = -748.8, 22.1 km
Mean diameter = 27 km

From 5 chords (CCD,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: 2025-04-11, 22:00 UT (JD = 2460777.417)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 751None9.158 67°, 59° 2.451175e69602.40.0° NoneNone not scaled 2013-10-18
# 752None9.158 283°, 44° 2.451175e69602.40.0° None2019-05-31 not scaled 2013-10-18
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] : 228aeaa0-8597-11ef-78cd-a4906ffb4610 [asteroids]

 Occultation Date + Time   : 2025-04-11 at 21:57:54 UT +/- 0.0 min  [1]
 Object Designation        : (364) Isara
 Orbit Class               : MBA
 Star Designation          : GDR3 0681671615512765440
 Star Coordinates (ICRF)   : RA = 07 57 40.8964, DE = +25 13 04.649  [2]
 Star Magnitudes           : G = 12.73 mag, RP = 12.02 mag, BP = 13.29 mag
 Object Magnitude          : V = 14.13 mag
 Estimated Magnitude Drop  : 1.7 mag
 Estimated Max. Duration   : 1.7 sec
 Object Mean Diameter      : 28.0 km  (src: astorb)
 Speed of the shadow       : 16.5 km/s
 Elongation to Moon & Sun  : 74° (sunlit = 99%), Sun = 94°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#101

 
 [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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