Cora»Occultation

2023-06-09 / UCAC4 416-092139 / (676) Melitta

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Wojciech Burzynski	O+	VID	M250	PL	GPS	23:54:52	23:55:57.088	23:56:02.089	23:56:32	0.335	0.335	5.00	44.5
2	show	Konrad Guhl	O+	CCD	M306	DE	GPS	23:56:00	23:57:09.3	23:57:18.4	23:58:30	0.6	0.4	9.10	81.0
3	show	Alex Pratt	O+	VID	M280	GB	GPS	23:58:05	23:58:48.31	23:58:57.97	23:59:35	0.34	0.34	9.66	86.0

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 : 2fec18f0-ddb0-11f0-547e-e590db77bcf9 [db: observed]

Using prediction 2fec18f0-ddb0-11f0-547e-e590db77bcf9 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 = 93 x 53 km
a',b' = 46.4, 26.4 km
X0,Y0 = 112.2, 14.7 km
Mean diameter = 70 km

From 3 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: 2023-06-09, 23:55 UT (JD = 2460105.497)

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	2781.5	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5681	1.0	16.741	236°, -26°	2.457324e6	2781.5	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] : 2fec18f0-ddb0-11f0-547e-e590db77bcf9 [observed] Occultation Date + Time : 2023-06-09 at 23:56:07 UT +/- 0.0 min [1] Object Designation : (676) Melitta Orbit Class : MBA Star Designation : GDR3 4253114179735058432 Star Coordinates (ICRF) : RA = 18 45 02.7739, DE = -06 48 40.895 [2] Star Magnitudes : G = 14.27 mag, RP = 13.87 mag, BP = 14.51 mag Object Magnitude : V = 13.98 mag Estimated Magnitude Drop : 0.6 mag Estimated Max. Duration : 9.0 sec Object Mean Diameter : 80.0 km (src: astorb) Speed of the shadow : 8.9 km/s Elongation to Moon & Sun : 59° (sunlit = 60%), Sun = 152° Cross-track uncertainty : 0.4 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.91 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] : 2fec18f0-ddb0-11f0-547e-e590db77bcf9 [observed]

 Occultation Date + Time   : 2023-06-09 at 23:56:07 UT +/- 0.0 min  [1]
 Object Designation        : (676) Melitta
 Orbit Class               : MBA
 Star Designation          : GDR3 4253114179735058432
 Star Coordinates (ICRF)   : RA = 18 45 02.7739, DE = -06 48 40.895  [2]
 Star Magnitudes           : G = 14.27 mag, RP = 13.87 mag, BP = 14.51 mag
 Object Magnitude          : V = 13.98 mag
 Estimated Magnitude Drop  : 0.6 mag
 Estimated Max. Duration   : 9.0 sec
 Object Mean Diameter      : 80.0 km  (src: astorb)
 Speed of the shadow       : 8.9 km/s
 Elongation to Moon & Sun  : 59° (sunlit = 60%), Sun = 152°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.91 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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