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2023-08-23 / UCAC4 473-001332 / (41) Daphne

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Ramon Iglesias O+ CCD T400 ES NTP 22:44:03 22:48:41.700 22:48:48.600 22:57:57 0.7 1.5 6.90 63.5
2 show Oscar Canales O+ VID M200 ES GPS 22:44:30 22:48:24.8 22:48:32.0 22:52:30 1.3 1.3 7.20 66.2
3 show Jean jacques Castellani O+ VID M400 FR GPS 22:47:00 22:47:56.30 22:48:11.60 22:49:03 0.6 0.6 15.30 140.8
4 show Jean-Baptiste Marquette O+ VID M200 FR NTP 22:43:59 22:47:50.180 22:48:07.000 22:54:59 2.06 2.06 16.82 154.7
5 show Arnaud Leroy, Romain Montaigut O+ CCD M200 FR NTP 22:46:05 22:47:38.40 22:47:46.40 23:49:58 1.4 1.3 8.00 73.6
6 show Peter Tickner O+ VID M356 GB GPS 22:45:25 22:46:28.198 22:46:48.200 22:50:18 1.95 1.95 20.00 184.0
7 show Olivier Schreurs, Esteban Fernandez'Pelaez O- VID M410 BE GPS 22:45:34 22:47:35
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

7 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#152 : 745fa350-97f3-421d-a4cf-78d65082819f [db: observed]

Using prediction 745fa350-97f3-421d-a4cf-78d65082819f 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 = 246 x 45 km
a',b' = 123.2, 22.3 km
X0,Y0 = 4497.2, 52.3 km
Mean diameter = 105 km

From 6 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: 2023-08-23, 22:48 UT (JD = 2460180.450)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 131None5.988 198°, -32° 2.44477179382e615408.70.0° size from AO is 186+/-27 km2013-07-23 187.0 +/- 20.0 km 2011-03-28
# 17934.05.988 200°, -32° 2.44477179382e615408.70.0° None2019-01-11 187.0 +/- 7.0 km 2018-08-24
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] : 745fa350-97f3-421d-a4cf-78d65082819f [observed]

 Occultation Date + Time   : 2023-08-23 at 22:49:29 UT +/- 0.02 min  [1]
 Object Designation        : (41) Daphne
 Orbit Class               : MBA
 Star Designation          : GDR3 2551829122129802240
 Star Coordinates (ICRF)   : RA = 00 57 06.9326, DE = +04 27 45.357  [2]
 Star Magnitudes           : G = 14.55 mag, RP = 14.03 mag, BP = 14.89 mag
 Object Magnitude          : V = 12.91 mag
 Estimated Magnitude Drop  : 0.2 mag
 Estimated Max. Duration   : 18.9 sec
 Object Mean Diameter      : 174 km  (src: astorb)
 Speed of the shadow       : 9.2 km/s
 Elongation to Moon & Sun  : 140° (sunlit = 45%), Sun = 136°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.99 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#152

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

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