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2018-04-21 / 2UC 27680435 / (103) Hera

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Gerhard Dangl O+ VID M254 AT GPS++ 22:15:04 22:16:18.40 22:16:27.36 22:18:12 0.08 0.08 8.96 75.3
2 show Jiri Kubanek O+ VID M203 CZ GPS++ 22:13:31 22:16:23.59 22:16:34.47 22:19:31 0.32 0.32 10.88 91.4
3 show Michal Rottenborn O+ VID M303 CZ GPS++ 22:14:26 22:16:24.70 22:16:34.30 22:18:26 0.32 0.32 9.60 80.6
4 show Esdert Edens O+ VID M250 NL GPS++ 22:13:56 22:16:53.81 22:17:03.01 22:19:55 0.08 0.16 9.20 77.3
5 show Karel Halir O- VID M507 CZ 22:14:00 22:19:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

5 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#135 : 58ba25f2-ec32-4328-bc81-6d8fcc9d06c8 [db: observed]

Using prediction 58ba25f2-ec32-4328-bc81-6d8fcc9d06c8 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 99 km

From 4 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: 2018-04-21, 22:15 UT (JD = 2458230.427)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 917None23.743 85°, 24° 2.443658e614572.40.0° NoneNone not scaled 2016-01-04
# 918None23.743 270°, 40° 2.443658e614572.40.0° 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] : 58ba25f2-ec32-4328-bc81-6d8fcc9d06c8 [observed]

 Occultation Date + Time   : 2018-04-21 at 22:07:29 UT +/- 0.01 min  [1]
 Object Designation        : (103) Hera
 Orbit Class               : MBA
 Star Designation          : GDR3 6267770677003235328
 Star Coordinates (ICRF)   : RA = 15 50 44.6968, DE = -11 40 14.031  [2]
 Star Magnitudes           : G = 12.31 mag, RP = 11.73 mag, BP = 12.73 mag
 Object Magnitude          : V = 11.87 mag
 Estimated Magnitude Drop  : 0.6 mag
 Estimated Max. Duration   : 10.8 sec
 Object Mean Diameter      : 91 km  (src: astorb)
 Speed of the shadow       : 8.4 km/s
 Elongation to Moon & Sun  : 129° (sunlit = 39%), Sun = 153°
 Cross-track uncertainty   : 2.0 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#135

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

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