Cora»Occultation

2023-05-08 / UCAC4 619-035010 / (117) Lomia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Daniel Blazewicz	O+	CCD	M350	PL	GPS	21:20:54	21:21:42.66	21:21:47.36	21:23:53	0.15	0.15	4.70	168.7
2	show	Leszek Benedyktowicz	O+	VID	M200	PL	GPS	21:20:31	21:21:43.3	21:21:47.5	21:22:43	0.3	0.3	4.20	150.8
3	show	Marcin Filipek	O+	VID	M250	PL	GPS	21:21:01	21:21:42.590	21:21:47.290	21:22:30	0.1	0.1	4.70	168.7
4	show	Marek Zawilski, Mieczyslaw Borkowski	O+	VID	M200	PL	GPS	21:21:09	21:21:38.4	21:21:43.3	21:22:25	0.20	0.20	4.90	175.9
5	show	Daniel Antuszewicz	O+	VID	M203	PL	NTP	21:20:44	21:21:36.96	21:21:40.20	21:22:41	0.20	0.20	3.24	116.3
6	show	Petr Zeleny	O-	VID	M250	CZ	GPS	21:19:00			21:25:00
7	show	Anna Marciniak	O-	CCD	M350	PL	GPS	21:20:30			21:22:58

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#141 : 970c5e20-ddb3-11f0-547e-3f28dededba8 [db: observed]

Using prediction 970c5e20-ddb3-11f0-547e-3f28dededba8 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 = 193 x 124 km
a',b' = 96.7, 62.1 km
X0,Y0 = -1197.7, 17.1 km
Mean diameter = 155 km

From 5 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: 2023-05-08, 21:21 UT (JD = 2460073.390)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 838	None	9.124	117°, -19°	2.446333e6	13740.4	0.0°	None	None	not scaled	2016-01-04
# 839	None	9.124	323°, -57°	2.446333e6	13740.4	0.0°	None	None	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] : 970c5e20-ddb3-11f0-547e-3f28dededba8 [observed] Occultation Date + Time : 2023-05-08 at 21:20:27 UT +/- 0.0 min [1] Object Designation : (117) Lomia Orbit Class : MBA Star Designation : GDR3 0941398767623502336 Star Coordinates (ICRF) : RA = 06 36 04.4318, DE = +33 40 56.618 [2] Star Magnitudes : G = 13.91 mag, RP = 13.39 mag, BP = 14.26 mag Object Magnitude : V = 14.07 mag Estimated Magnitude Drop : 0.8 mag Estimated Max. Duration : 4.1 sec Object Mean Diameter : 148.7 km (src: astorb) Speed of the shadow : 35.9 km/s Elongation to Moon & Sun : 169° (sunlit = 88%), Sun = 50° Cross-track uncertainty : 0.7 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.2 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#141 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 970c5e20-ddb3-11f0-547e-3f28dededba8 [observed]

 Occultation Date + Time   : 2023-05-08 at 21:20:27 UT +/- 0.0 min  [1]
 Object Designation        : (117) Lomia
 Orbit Class               : MBA
 Star Designation          : GDR3 0941398767623502336
 Star Coordinates (ICRF)   : RA = 06 36 04.4318, DE = +33 40 56.618  [2]
 Star Magnitudes           : G = 13.91 mag, RP = 13.39 mag, BP = 14.26 mag
 Object Magnitude          : V = 14.07 mag
 Estimated Magnitude Drop  : 0.8 mag
 Estimated Max. Duration   : 4.1 sec
 Object Mean Diameter      : 148.7 km  (src: astorb)
 Speed of the shadow       : 35.9 km/s
 Elongation to Moon & Sun  : 169° (sunlit = 88%), Sun = 50°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.2 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#141
 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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