Cora»Occultation

2022-12-20 / UCAC4 677-042617 / (1000) Piazzia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Derrick Ward	O+	VID	M200	GB	NTP	22:02:58	22:04:59.570	22:05:01.500	22:06:58	0.11	0.30	1.93	33.4
2	show	Simon Kidd	O+	VID	M350	GB	GPS	22:03:50	22:04:51.823	22:04:55.665	22:05:50	0.013	0.013	3.84	66.4
3	show	Philip Denyer	O-	VID	M235	GB	GPS	22:03:43			22:06:06

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#77 : 3ce6d290-ddb3-11f0-547e-d366eaff774d [db: observed]

Using prediction 3ce6d290-ddb3-11f0-547e-d366eaff774d 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:
X0,Y0 = -9.3, 3.5 km
Circular diameter = 75 km

From 2 chords (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: 2022-12-20, 22:03 UT (JD = 2459934.419)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 3529	1.0	9.477	131°, -54°	2.451051e6	8883.4	0.0°	None	2019-09-26	not scaled	2019-05-07

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] : 3ce6d290-ddb3-11f0-547e-d366eaff774d [observed] Occultation Date + Time : 2022-12-20 at 22:02:47 UT +/- 0.0 min [1] Object Designation : (1000) Piazzia Orbit Class : MBA Star Designation : GDR3 0962522615077979648 Star Coordinates (ICRF) : RA = 06 16 03.5602, DE = +45 18 19.393 [2] Star Magnitudes : G = 12.03 mag, RP = 11.49 mag, BP = 12.4 mag Object Magnitude : V = 16.3 mag Estimated Magnitude Drop : 4.3 mag Estimated Max. Duration : 2.8 sec Object Mean Diameter : 47.7 km (src: astorb) Speed of the shadow : 17.3 km/s Elongation to Moon & Sun : 137° (sunlit = 9%), Sun = 158° Cross-track uncertainty : 0.7 mas = 1 km = 0.03 path-width (1-sig) RUWE and duplicate source : 0.97 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#77 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 3ce6d290-ddb3-11f0-547e-d366eaff774d [observed]

 Occultation Date + Time   : 2022-12-20 at 22:02:47 UT +/- 0.0 min  [1]
 Object Designation        : (1000) Piazzia
 Orbit Class               : MBA
 Star Designation          : GDR3 0962522615077979648
 Star Coordinates (ICRF)   : RA = 06 16 03.5602, DE = +45 18 19.393  [2]
 Star Magnitudes           : G = 12.03 mag, RP = 11.49 mag, BP = 12.4 mag
 Object Magnitude          : V = 16.3 mag
 Estimated Magnitude Drop  : 4.3 mag
 Estimated Max. Duration   : 2.8 sec
 Object Mean Diameter      : 47.7 km  (src: astorb)
 Speed of the shadow       : 17.3 km/s
 Elongation to Moon & Sun  : 137° (sunlit = 9%), Sun = 158°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#77
 Note                      : FP:true

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

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