2024-12-18 / UCAC4 603-022085 / (578) Happelia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jorge JUAN	O+	VID	M410	ES	GPS	20:11:45	20:14:08.9	20:14:12.5	20:16:11	0.2	0.2	3.60	54.0
2	show	Antoni Selva, Carlos Perello	O+	VID	M500	ES	GPS	20:12:14	20:14:07.300	20:14:11.600	20:16:14	0.4	0.5	4.30	64.5

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

2 observations found in db: sodis

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

JPL#149 : c2d8e9e0-ddb5-11f0-547e-52eaf57f9334 [db: observed]

Using prediction c2d8e9e0-ddb5-11f0-547e-52eaf57f9334 for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: X0,Y0 = 17.8, 21.6 km Circular diameter = 70 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: 2024-12-18, 20:14 UT (JD = 2460663.343)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 660	None	10.064	339°, 62°	2.450857e6	9806.3	0.0°	None	None	70.0 +/- 5.0 km	2013-02-11

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

Map with groundtrack and observer stations

Event Details

Occultation UUID [and DB] : c2d8e9e0-ddb5-11f0-547e-52eaf57f9334 [observed] Occultation Date + Time : 2024-12-18 at 20:10:14 UT +/- 0.0 min [1] Object Designation : (578) Happelia Orbit Class : MBA Star Designation : GDR3 3446970434845731200 Star Coordinates (ICRF) : RA = 05 25 58.2264, DE = +30 26 41.163 [2] Star Magnitudes : G = 14.58 mag, RP = 13.66 mag, BP = 15.45 mag Object Magnitude : V = 14.09 mag Estimated Magnitude Drop : 0.5 mag Estimated Max. Duration : 4.6 sec Object Mean Diameter : 69.3 km (src: astorb) Speed of the shadow : 15.0 km/s Elongation to Moon & Sun : 48° (sunlit = 86%), Sun = 171° Cross-track uncertainty : 0.4 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.42 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#149 Note : FP:true Object is a Gaia mass determination target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations
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