Cora»Occultation

2022-07-21 / 4UC 438-112881 / (409) Aspasia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Englmaier	O+	CCD	M405	CH	GPS++	20:48:35	20:49:19.11	20:49:28.21	20:50:06	0.40	0.40	9.10	94.6
2	show	Martin Gutekunst	O+	CCD	L280	DE	NTP+	20:48:32	20:49:01.22	20:49:15.05	20:49:50	0.09	0.09	13.83	143.8
3	show	Manfred Simon	O+	CCD	M203	DE	NTP+	20:47:36	20:49:03.58	20:49:17.98	20:50:36	0.21	0.21	14.40	149.8
4	show	Gregor Krannich	O+	CCD	M350	DE	GPS++	20:48:00	20:49:00.84	20:49:16.16	20:50:10	0.08	0.08	15.32	159.3
5	show	Karl-Ludwig Bath	O+	CCD	M180	DE	NTP+	20:47:00	20:49:15.99	20:49:31.00	20:51:00	0.13	0.13	15.01	156.1
6	show	Bernd Gaehrken	O+	CCD	M400	DE	RAD	20:44:55	20:48:56.5	20:49:12.2	20:53:38	0.5	0.5	15.70	163.3
7	show	P. Nosal et al	O+	CCD	L100	SK	NTP+	20:46:18	20:48:11.0	20:48:26.4	20:50:47	0.2	0.2	15.40	160.2
8	show	Peter Delincak	O+	CCD	M400	SK	GPS++	20:48:00	20:48:13.98	20:48:20.69	20:48:35	0.04	0.04	6.71	69.8
9	show	Jiri Kubanek	O+	CCD	M200	CZ	GPS++	20:47:06	20:48:45.63	20:48:54.15	20:51:09	0.12	0.12	8.52	88.6
10	show	Jiri Polak	O+	CCD	M303	CZ	GPS++	20:46:43	20:48:44.66	20:48:45.04	20:50:43	0.03	0.05	0.38	4.0
11	show	Lionel Rousselot	O-	CCD	M250	FR		20:47:52			20:51:53

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

11 observations found in db: euraster

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

JPL#124 : c101a374-f63a-4b07-9b01-8ea0ff8139ba [db: observed]

JPL#124 : 6b559c84-64ba-4922-9467-9b19e50469f4 [db: observed]

Using prediction c101a374-f63a-4b07-9b01-8ea0ff8139ba 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 162 km
a',b' = 96.5, 80.9 km
X0,Y0 = -10.8, 30.7 km
Mean diameter = 177 km

From 10 chords (CCD)

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: 2022-07-21, 20:48 UT (JD = 2459782.367)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 215	None	9.021	3°, 30°	2.44431e6	15472.4	0.0°	None	2011-04-11	173.0 +/- 17.0 km	2011-03-28
# 715	4.0	9.021	4°, 29°	2.44431e6	15472.4	0.0°	None	2017-06-19	164.0 +/- 3.0 km	2017-06-19

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] : c101a374-f63a-4b07-9b01-8ea0ff8139ba [observed] Occultation Date + Time : 2022-07-21 at 20:44:30 UT +/- 0.02 min [1] Object Designation : (409) Aspasia Orbit Class : MBA Star Designation : GDR3 4222824455452470016 Star Coordinates (ICRF) : RA = 20 20 16.8803, DE = -02 32 42.336 [2] Star Magnitudes : G = 11.6 mag, RP = 10.96 mag, BP = 12.06 mag Object Magnitude : V = 11.04 mag Estimated Magnitude Drop : 0.5 mag Estimated Max. Duration : 15.5 sec Object Mean Diameter : 162 km (src: astorb) Speed of the shadow : 10.4 km/s Elongation to Moon & Sun : 97° (sunlit = 37%), Sun = 162° Cross-track uncertainty : 3.3 mas = 3 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.93 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#124 Object is a Gaia mass determination target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : c101a374-f63a-4b07-9b01-8ea0ff8139ba [observed]

 Occultation Date + Time   : 2022-07-21 at 20:44:30 UT +/- 0.02 min  [1]
 Object Designation        : (409) Aspasia
 Orbit Class               : MBA
 Star Designation          : GDR3 4222824455452470016
 Star Coordinates (ICRF)   : RA = 20 20 16.8803, DE = -02 32 42.336  [2]
 Star Magnitudes           : G = 11.6 mag, RP = 10.96 mag, BP = 12.06 mag
 Object Magnitude          : V = 11.04 mag
 Estimated Magnitude Drop  : 0.5 mag
 Estimated Max. Duration   : 15.5 sec
 Object Mean Diameter      : 162 km  (src: astorb)
 Speed of the shadow       : 10.4 km/s
 Elongation to Moon & Sun  : 97° (sunlit = 37%), Sun = 162°
 Cross-track uncertainty   : 3.3 mas = 3 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#124

 Object is a Gaia mass determination target !

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

More Data and Informations

SiMDA \| 3D Asteroid Catalogue \| Johnston Archive \| Star at CDS (Vizier) \| JPL Small-Body Node \| Minor Planet Center \| Wikipedia

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Aladin Sky Atlas

Aladin Lite direct link (has Gaia overlay)

Collaborative Occultation Resources and Archive (CORA)

2022-07-21 / 4UC 438-112881 / (409) Aspasia

Sky projection (artificial light) for occ. time: 2022-07-21, 20:48 UT (JD = 2459782.367)