Cora»Occultation

2018-10-29 / 4UC 409-131091 / (156) Xanthippe

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Richard Miles	O+	VID	L105	UK	GPS++	19:17:38	19:19:03.72	19:19:08.34	19:20:38	0.16	0.10	4.62	81.8
2	show	David Briggs	O+	VID	M406	UK	GPS	19:17:42	19:19:09.30	19:19:13.50	19:20:42			4.20	74.3
3	show	Geoffrey Thurston	O+	VID	M355	UK	GPS++	19:19:00	19:19:07.98	19:19:13.64	19:20:00	0.32	0.32	5.66	100.2
4	show	Malcolm Jennings	O+	VID	M276	UK	RAD++	19:14:00	19:19:11.06	19:19:16.46	19:22:00	0.04	0.04	5.40	95.6
5	show	Peter Tickner	O+	CCD	M300	UK	GPS	19:17:03	19:19:07.51	19:19:13.13	19:21:15	0.05	0.07	5.62	99.5
6	show	Peter Birtwhistle	O+	CCD	M405	UK	NTP	19:19:02	19:19:05.53	19:19:11.13	19:19:22	0.06	0.06	5.60	99.1
7	show	Tim Haymes	O+	VID	M300	UK	GPS++	19:17:13	19:19:07.65	19:19:13.35	19:21:13	0.05	0.03	5.70	100.9
8	show	Adrian Jones	O+	VID	M303	UK	GPS++	19:17:20	19:19:08.04	19:19:13.80	19:21:08	0.32	0.16	5.76	102.0
9	show	Philip Denyer	O+	VID	M235	UK	GPS++	19:17:01	19:19:11.46	19:19:17.14	19:21:20	0.04	0.04	5.68	100.5
10	show	D. Bamberger et al	O+	CCD	M253	UK	NTP	19:15:41	19:19:09.11	19:19:14.81	19:21:43	0.25	0.25	5.70	100.9
11	show	Chris Hooker	O+	CCD	M254	UK	NTP	19:16:01	19:19:05.76	19:19:11.42	19:22:00	0.10	0.10	5.66	100.2
12	show	Sean Clarke	O+	VID	M495	UK	GPS++	19:17:00	19:19:07.10	19:19:12.70	19:21:00	0.48	0.32	5.60	99.1
13	show	Simon Kidd	O+	CCD	M350	UK	GPS	19:18:00	19:19:10.20	19:19:15.22	19:21:00	0.01	0.01	5.02	88.9
14	show	Luke Broom-Lynne	O+	VID	M200	UK	GPS++	19:18:59	19:19:14.25	19:19:17.53	19:19:47	0.02	0.02	3.28	58.1

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

14 observations found in db: euraster

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

JPL#189 : 825ecd00-c4ed-410e-9e18-aa8e67f1ff70 [db: observed]

Using prediction 825ecd00-c4ed-410e-9e18-aa8e67f1ff70 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 = 105 x 93 km
a',b' = 52.5, 46.4 km
X0,Y0 = 46.2, 29.2 km
Mean diameter = 99 km

From 14 chords (VID,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: 2018-10-29, 19:18 UT (JD = 2458421.304)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4643	1.0	22.116	197°, 9°	2.457319e6	1102.3	0.0°	None	2020-10-05	not scaled	2019-10-23
# 4644	1.0	22.116	22°, 15°	2.457319e6	1102.3	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] : 825ecd00-c4ed-410e-9e18-aa8e67f1ff70 [observed] Occultation Date + Time : 2018-10-29 at 19:17:51 UT +/- 0.01 min [1] Object Designation : (156) Xanthippe Orbit Class : MBA Star Designation : GDR3 6905947768587319808 Star Coordinates (ICRF) : RA = 20 28 11.6144, DE = -08 13 04.573 [2] Star Magnitudes : G = 12.07 mag, RP = 11.22 mag, BP = 12.82 mag Object Magnitude : V = 14.17 mag Estimated Magnitude Drop : 2.3 mag Estimated Max. Duration : 6.8 sec Object Mean Diameter : 121 km (src: astorb) Speed of the shadow : 17.7 km/s Elongation to Moon & Sun : 153° (sunlit = 71%), Sun = 91° Cross-track uncertainty : 1.3 mas = 2 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.93 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#189 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 825ecd00-c4ed-410e-9e18-aa8e67f1ff70 [observed]

 Occultation Date + Time   : 2018-10-29 at 19:17:51 UT +/- 0.01 min  [1]
 Object Designation        : (156) Xanthippe
 Orbit Class               : MBA
 Star Designation          : GDR3 6905947768587319808
 Star Coordinates (ICRF)   : RA = 20 28 11.6144, DE = -08 13 04.573  [2]
 Star Magnitudes           : G = 12.07 mag, RP = 11.22 mag, BP = 12.82 mag
 Object Magnitude          : V = 14.17 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 6.8 sec
 Object Mean Diameter      : 121 km  (src: astorb)
 Speed of the shadow       : 17.7 km/s
 Elongation to Moon & Sun  : 153° (sunlit = 71%), Sun = 91°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#189

 
 [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)

2018-10-29 / 4UC 409-131091 / (156) Xanthippe

Sky projection (artificial light) for occ. time: 2018-10-29, 19:18 UT (JD = 2458421.304)