Cora»Occultation

2023-09-25 / UCAC4 553-005449 / (595) Polyxena

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jean-Francois Pittet	O+	VID	M254	DE	GPS	19:24:34	19:25:59.92	19:26:04.80	19:27:32	0.13	0.15	4.88	43.4
2	show	Andreas Tazreiter	O+	CCD	L180	AT	GPS	19:23:17	19:25:55.7	19:26:06.3	19:31:17	0.9	1.0	10.60	94.3
3	show	Marian Urbanik	O+	VID	T400	SK	GPS	19:24:12	19:25:42.4	19:25:55.21	19:27:11	0.3	0.17	12.81	114.0

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#117 : 13ff0fe0-ddb4-11f0-547e-e56effdf4637 [db: observed]

Using prediction 13ff0fe0-ddb4-11f0-547e-e56effdf4637 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 = 132 x 85 km
a',b' = 65.9, 42.6 km
X0,Y0 = -946.2, 26.2 km
Mean diameter = 106 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: 2023-09-25, 19:25 UT (JD = 2460213.309)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 228	None	11.794	42°, 8°	2.449187e6	11026.3	0.0°	preliminary model, agrees well with occultation data http://www.asteroidoccultation.com/observations/Results/Data2015/20150415_PolyxenaProfileDAMIT228.gif	2015-08-25	not scaled	2008-09-16
# 229	None	11.794	222°, -4°	2.449187e6	11026.3	0.0°	preliminary model, probably wrong pole solution, does not agree with occultation data http://www.asteroidoccultation.com/observations/Results/	2015-08-25	not scaled	2008-09-16

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] : 13ff0fe0-ddb4-11f0-547e-e56effdf4637 [observed] Occultation Date + Time : 2023-09-25 at 19:15:09 UT +/- 0.01 min [1] Object Designation : (595) Polyxena Orbit Class : MBA Star Designation : GDR3 0085138002837333504 Star Coordinates (ICRF) : RA = 02 48 51.4415, DE = +20 29 03.700 [2] Star Magnitudes : G = 12.25 mag, RP = 11.75 mag, BP = 12.59 mag Object Magnitude : V = 13.14 mag Estimated Magnitude Drop : 1.3 mag Estimated Max. Duration : 12.2 sec Object Mean Diameter : 109.1 km (src: astorb) Speed of the shadow : 8.9 km/s Elongation to Moon & Sun : 94° (sunlit = 82%), Sun = 136° Cross-track uncertainty : 2.0 mas = 3 km = 0.03 path-width (1-sig) RUWE and duplicate source : 1.18 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#117 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 13ff0fe0-ddb4-11f0-547e-e56effdf4637 [observed]

 Occultation Date + Time   : 2023-09-25 at 19:15:09 UT +/- 0.01 min  [1]
 Object Designation        : (595) Polyxena
 Orbit Class               : MBA
 Star Designation          : GDR3 0085138002837333504
 Star Coordinates (ICRF)   : RA = 02 48 51.4415, DE = +20 29 03.700  [2]
 Star Magnitudes           : G = 12.25 mag, RP = 11.75 mag, BP = 12.59 mag
 Object Magnitude          : V = 13.14 mag
 Estimated Magnitude Drop  : 1.3 mag
 Estimated Max. Duration   : 12.2 sec
 Object Mean Diameter      : 109.1 km  (src: astorb)
 Speed of the shadow       : 8.9 km/s
 Elongation to Moon & Sun  : 94° (sunlit = 82%), Sun = 136°
 Cross-track uncertainty   : 2.0 mas = 3 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.18 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#117
 Note                      : FP:true

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

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