Cora»Occultation

2023-10-05 / UCAC4 576-012121 / (95) Arethusa

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Serge Dramonis	O+	VID	M400	GR	GPS	00:34:08	00:34:19.49	00:34:50.39	00:36:00	0.1	0.1	30.90	157.6
2	show	Oscar Canales	O+	VID	M200	ES	GPS	00:25:44	00:28:35.06	00:29:04.98	00:31:45	0.14	0.14	29.92	152.6
3	show	Mikel Martínez	O+	CCD	M200	ES	NTP	00:27:26	00:28:11.06	00:28:42.80	00:29:31	0.63	0.63	31.74	161.9
4	show	Javier Prat, Periko Martorell, +1	O+	CCD	M300	ES	GPS	00:27:59	0:28:17.387	0:28:49.941	00:29:21	0.13	0.13	32.55	166.0
5	show	Yves Argentin	O+	VID	M305	FR	GPS	00:28:09	00:28:56.93	00:29:06.05	00:29:39	0.1	0.1	9.12	46.5
6	show	Ricard Casas	O-	VID	M200	ES	GPS	00:28:30			00:30:19
7	show	Faustino Garcia	O-	VID	T250	ES	GPS	00:26:41			00:28:42

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#75 : 227e7510-ddb4-11f0-547e-91a22ffed81c [db: observed]

Using prediction 227e7510-ddb4-11f0-547e-91a22ffed81c 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 = 161 x 149 km
a',b' = 80.7, 74.4 km
X0,Y0 = 25.3, 22.8 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: 2023-10-05, 00:34 UT (JD = 2460222.524)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 294	None	8.702	149°, 33°	2.444085e6	16137.5	0.0°	None	2011-04-11	147.0 +/- 32.0 km	2011-02-16

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] : 227e7510-ddb4-11f0-547e-91a22ffed81c [observed] Occultation Date + Time : 2023-10-05 at 00:43:47 UT +/- 0.02 min [1] Object Designation : (95) Arethusa Orbit Class : MBA Star Designation : GDR3 0147208526602511360 Star Coordinates (ICRF) : RA = 04 49 08.3970, DE = +25 07 26.250 [2] Star Magnitudes : G = 12.26 mag, RP = 11.35 mag, BP = 13.1 mag Object Magnitude : V = 12.55 mag Estimated Magnitude Drop : 0.9 mag Estimated Max. Duration : 26.8 sec Object Mean Diameter : 136.0 km (src: astorb) Speed of the shadow : 5.1 km/s Elongation to Moon & Sun : 10° (sunlit = 65%), Sun = 118° Cross-track uncertainty : 0.7 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#75 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 227e7510-ddb4-11f0-547e-91a22ffed81c [observed]

 Occultation Date + Time   : 2023-10-05 at 00:43:47 UT +/- 0.02 min  [1]
 Object Designation        : (95) Arethusa
 Orbit Class               : MBA
 Star Designation          : GDR3 0147208526602511360
 Star Coordinates (ICRF)   : RA = 04 49 08.3970, DE = +25 07 26.250  [2]
 Star Magnitudes           : G = 12.26 mag, RP = 11.35 mag, BP = 13.1 mag
 Object Magnitude          : V = 12.55 mag
 Estimated Magnitude Drop  : 0.9 mag
 Estimated Max. Duration   : 26.8 sec
 Object Mean Diameter      : 136.0 km  (src: astorb)
 Speed of the shadow       : 5.1 km/s
 Elongation to Moon & Sun  : 10° (sunlit = 65%), Sun = 118°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#75
 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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