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2022-07-16 / 4UC 358-122943 / (797) Montana

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Carles Schnabel O+ VID M400 ES GPS++ 23:46:28 23:48:12.81 23:48:14.81 23:50:04 0.16 0.24 2.00 14.2
2 show H. Pallares et al O+ VID M500 ES GPS++ 23:46:20 23:48:11.00 23:48:12.44 23:50:18 0.08 0.08 1.44 10.2
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

2 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#53 : f9801e11-fc06-4fb4-8a00-9fa3fdd0af68 [db: observed]

Using prediction f9801e11-fc06-4fb4-8a00-9fa3fdd0af68 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 = -328.5, 15.9 km
Circular diameter = 21 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: 2022-07-16, 23:48 UT (JD = 2459777.492)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 964None4.546 6°, 61° 2.450966e68811.50.0° NoneNone not scaled 2016-01-04
# 965None4.546 179°, 45° 2.450966e68811.50.0° NoneNone not scaled 2016-01-04
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] : f9801e11-fc06-4fb4-8a00-9fa3fdd0af68 [observed]

 Occultation Date + Time   : 2022-07-16 at 23:52:18 UT +/- 0.03 min  [1]
 Object Designation        : (797) Montana
 Orbit Class               : MBA
 Star Designation          : GDR3 4119631372180053888
 Star Coordinates (ICRF)   : RA = 17 53 11.7113, DE = -18 34 57.024  [2]
 Star Magnitudes           : G = 14.35 mag, RP = 13.05 mag, BP = 16.27 mag
 Object Magnitude          : V = 13.9 mag
 Estimated Magnitude Drop  : 0.6 mag
 Estimated Max. Duration   : 3.9 sec
 Object Mean Diameter      : 28 km  (src: astorb)
 Speed of the shadow       : 7.1 km/s
 Elongation to Moon & Sun  : 72° (sunlit = 85%), Sun = 154°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.04 path-width (1-sig)
 RUWE and duplicate source : 0.86 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#53

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

More Data and Informations
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