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2023-11-07 / UCAC4 546-017448 / (4489) Dracius

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Oscar Canales O+ VID M280 ES GPS 20:47:11 20:49:11.75 20:49:18.07 20:51:11 0.08 0.08 6.32 70.8
2 show Florian Signoret O+ VID T200 FR GPS 20:38:31 20:48:49.270 20:48:58.970 20:53:51 0.100 0.100 9.70 108.6
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: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#65 : d8a24e9b-60dc-4e81-b170-937f67837300 [db: observed]

Using prediction d8a24e9b-60dc-4e81-b170-937f67837300 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 = -724.6, 90.3 km
Circular diameter = 116 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: 2023-11-07, 20:48 UT (JD = 2460256.367)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 41851.012.584 136°, -27° 2.451136e69120.40.0° None2019-09-26 not scaled 2019-05-07
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] : d8a24e9b-60dc-4e81-b170-937f67837300 [observed]

 Occultation Date + Time   : 2023-11-07 at 20:40:40 UT +/- 0.08 min  [1]
 Object Designation        : (4489) Dracius
 Orbit Class               : JTRO
 Star Designation          : GDR3 3397890464866839168
 Star Coordinates (ICRF)   : RA = 05 39 04.2495, DE = +19 00 38.022  [2]
 Star Magnitudes           : G = 11.27 mag, RP = 10.66 mag, BP = 11.7 mag
 Object Magnitude          : V = 16.19 mag
 Estimated Magnitude Drop  : 4.9 mag
 Estimated Max. Duration   : 8.3 sec
 Object Mean Diameter      : 93 km  (src: astorb)
 Speed of the shadow       : 11.2 km/s
 Elongation to Moon & Sun  : 78° (sunlit = 27%), Sun = 140°
 Cross-track uncertainty   : 8.0 mas = 23 km = 0.26 path-width (1-sig)
 RUWE and duplicate source : 5.35 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#65

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

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