Cora»Occultation

2023-05-10 / UCAC4 451-065366 / (176) Iduna

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	00:59:22	01:01:14.71	01:01:23.53	01:03:25	0.12	0.12	8.82	128.8
2	show	Jan Manek	O+	VID	M356	CZ	GPS	00:59:18	01:01:16.70	01:01:18.24	01:03:18	0.04	0.04	1.54	22.5
3	show	Zdenek Moravec	O+	CCD	T432	CZ	GPS	01:00:31	1:01:21.55	1:01:25.25	01:02:23	0.10	0.10	3.70	54.0
4	show	Christian Weber	O-	VID	T203	DE	GPS	01:00:32			01:02:18

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

4 observations found in db: sodis

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

JPL#90 : 980d0540-ddb3-11f0-547e-2b1cbd7faf8d [db: observed]

Using prediction 980d0540-ddb3-11f0-547e-2b1cbd7faf8d 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 = 158 x 98 km
a',b' = 78.8, 49.1 km
X0,Y0 = -2433.1, 25.5 km
Mean diameter = 124 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: 2023-05-10, 01:00 UT (JD = 2460074.542)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 1338	None	11.288	85°, 29°	2.450774e6	9300.5	0.0°	None	2017-05-12	not scaled	2017-05-11
# 1339	None	11.288	156°, 79°	2.450774e6	9300.5	0.0°	None	2017-05-12	not scaled	2017-05-11

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] : 980d0540-ddb3-11f0-547e-2b1cbd7faf8d [observed] Occultation Date + Time : 2023-05-10 at 00:57:45 UT +/- 0.01 min [1] Object Designation : (176) Iduna Orbit Class : MBA Star Designation : GDR3 4381080088912506752 Star Coordinates (ICRF) : RA = 17 02 14.0846, DE = +00 03 56.551 [2] Star Magnitudes : G = 13.53 mag, RP = 12.74 mag, BP = 14.19 mag Object Magnitude : V = 13.93 mag Estimated Magnitude Drop : 1.0 mag Estimated Max. Duration : 8.3 sec Object Mean Diameter : 121.0 km (src: astorb) Speed of the shadow : 14.6 km/s Elongation to Moon & Sun : 41° (sunlit = 78%), Sun = 147° Cross-track uncertainty : 0.7 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.0 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#90 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 980d0540-ddb3-11f0-547e-2b1cbd7faf8d [observed]

 Occultation Date + Time   : 2023-05-10 at 00:57:45 UT +/- 0.01 min  [1]
 Object Designation        : (176) Iduna
 Orbit Class               : MBA
 Star Designation          : GDR3 4381080088912506752
 Star Coordinates (ICRF)   : RA = 17 02 14.0846, DE = +00 03 56.551  [2]
 Star Magnitudes           : G = 13.53 mag, RP = 12.74 mag, BP = 14.19 mag
 Object Magnitude          : V = 13.93 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 8.3 sec
 Object Mean Diameter      : 121.0 km  (src: astorb)
 Speed of the shadow       : 14.6 km/s
 Elongation to Moon & Sun  : 41° (sunlit = 78%), Sun = 147°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.0 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#90
 Note                      : FP:true

 
 [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

(If error 404: link not valid which means no data available)

Aladin Sky Atlas

Aladin Lite direct link (has Gaia overlay)