2024-07-21 / G210017.9-131151 / (335) Roberta

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Ferran Casarramona	O+	VID	M200	ES	GPS	21:18:02	21:18:45.60	21:18:58.40	21:20:01	0.16	0.40	12.80	84.5
2	show	Mikhail Ashchepkau, Michel Turchenko	O+	VID	M150	BY	PHONE	21:10:00	21:11:18.17	21:11:29.58	21:13:00	0.73	0.73	11.41	75.3
3	show	Marian Urbanik	O-	VID	T4000	SK	GPS	21:12:50			21:14:45
4	show	Marcin Filipek	O-	VID	M250	PL	GPS	21:13:10			21:13:40

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#95 : 1464ba10-ddb5-11f0-547e-bfdaddae2453 [db: observed]

JPL#95 : 1464ba10-ddb5-11f0-547e-f6abedff136d [db: observed]

Using prediction 1464ba10-ddb5-11f0-547e-f6abedff136d for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: X0,Y0 = 2820.9, 342.5 km Circular diameter = 88 km From 2 chords (VID) Chords to ignore: Fill: Grid: Show (close) miss chords: 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: 2024-07-21, 21:18 UT (JD = 2460513.388)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 3100	3.0	12.027	105°, 48°	2.444754e6	15759.4	0.0°	None	2019-06-25	100.0 +/- 11.0 km	2019-06-24
# 3101	3.0	12.027	297°, 54°	2.444754e6	15759.4	0.0°	None	2019-06-25	98.0 +/- 9.0 km	2019-06-24

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

Map with groundtrack and observer stations

Event Details

Occultation UUID [and DB] : 1464ba10-ddb5-11f0-547e-f6abedff136d [observed] Occultation Date + Time : 2024-07-21 at 21:14:34 UT +/- 0.02 min [1] Object Designation : (335) Roberta Orbit Class : MBA Star Designation : GDR3 6888490861127367040 Star Coordinates (ICRF) : RA = 21 00 17.8866, DE = -13 11 51.170 [2] Star Magnitudes : G = 11.28 mag, RP = 10.07 mag, BP = 10.88 mag Object Magnitude : V = 11.36 mag Estimated Magnitude Drop : 0.8 mag Estimated Max. Duration : 13.5 sec Object Mean Diameter : 89.1 km (src: astorb) Speed of the shadow : 6.6 km/s Elongation to Moon & Sun : 11° (sunlit = 100%), Sun = 165° Cross-track uncertainty : 1.6 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 4.2 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#95 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

Aladin Sky Atlas

Aladin Lite direct link (has Gaia overlay)