Cora»Occultation

2023-05-25 / UCAC4 415-102592 / (676) Melitta

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Olivier Schreurs	O+	VID	M200	BE	GPS	00:45:07	0:46:38.33	0:46:48.89	00:48:06	0.08	0.16	10.56	52.8
2	show	Karim Saci, Bruno, Thomas Halipré	O+	VID	M250	FR	GPS	00:43:02	00:47:7.96	00:47:22.34	00:51:02	0.06	0.06	14.38	71.9
3	show	Peter Tickner	O-	VID	M356	GB	GPS	00:45:31			00:49:59

UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

3 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):

JPL#81 : a8875010-ddb3-11f0-547e-ad7fee0bafa5 [db: observed]

Using prediction a8875010-ddb3-11f0-547e-ad7fee0bafa5 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 = -1584.7, 30.9 km
Circular diameter = 77 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).

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Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2023-05-25, 00:46 UT (JD = 2460089.532)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5680	1.0	16.741	64°, -74°	2.457324e6	2765.5	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5681	1.0	16.741	236°, -26°	2.457324e6	2765.5	0.0°	None	2020-10-05	not scaled	2019-10-23

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] : a8875010-ddb3-11f0-547e-ad7fee0bafa5 [observed] Occultation Date + Time : 2023-05-25 at 00:35:12 UT +/- 0.01 min [1] Object Designation : (676) Melitta Orbit Class : MBA Star Designation : GDR3 4252201550722576256 Star Coordinates (ICRF) : RA = 18 52 32.8550, DE = -07 01 51.482 [2] Star Magnitudes : G = 13.07 mag, RP = 12.67 mag, BP = 13.33 mag Object Magnitude : V = 14.28 mag Estimated Magnitude Drop : 1.5 mag Estimated Max. Duration : 15.9 sec Object Mean Diameter : 80.0 km (src: astorb) Speed of the shadow : 5.0 km/s Elongation to Moon & Sun : 150° (sunlit = 26%), Sun = 138° Cross-track uncertainty : 0.3 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.16 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#81 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : a8875010-ddb3-11f0-547e-ad7fee0bafa5 [observed]

 Occultation Date + Time   : 2023-05-25 at 00:35:12 UT +/- 0.01 min  [1]
 Object Designation        : (676) Melitta
 Orbit Class               : MBA
 Star Designation          : GDR3 4252201550722576256
 Star Coordinates (ICRF)   : RA = 18 52 32.8550, DE = -07 01 51.482  [2]
 Star Magnitudes           : G = 13.07 mag, RP = 12.67 mag, BP = 13.33 mag
 Object Magnitude          : V = 14.28 mag
 Estimated Magnitude Drop  : 1.5 mag
 Estimated Max. Duration   : 15.9 sec
 Object Mean Diameter      : 80.0 km  (src: astorb)
 Speed of the shadow       : 5.0 km/s
 Elongation to Moon & Sun  : 150° (sunlit = 26%), Sun = 138°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.16 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#81
 Note                      : FP:true

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

More Data and Informations

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