Collaborative Occultation Resources and Archive (CORA)

2025-03-05 / UCAC4 560-047449 / (2984) Chaucer

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Daniel Blazewicz	O+	VID	M350	PL	GPS	01:26:19	01:27:21.57	01:27:23.87	01:28:25	0.10	0.10	2.30	10.1
2	show	Marcin Filipek	O+	VID	M250	PL	GPS	01:27:01	01:27:29.08	01:27:31.33	01:27:57	0.15	0.15	2.25	9.9

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#51 : 6b634990-888d-11ef-78cd-893abf8ec3e1 [db: asteroids]

Using prediction 6b634990-888d-11ef-78cd-893abf8ec3e1 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 = -926.2, 18.0 km
Circular diameter = 11 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: 2025-03-05, 01:26 UT (JD = 2460739.560)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5062	1.0	9.023	204°, 44°	2.457227e6	3512.6	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5063	1.0	9.023	20°, 36°	2.457227e6	3512.6	0.0°	None	2020-10-05	not scaled	2019-10-23

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] : 6b634990-888d-11ef-78cd-893abf8ec3e1 [asteroids] Occultation Date + Time : 2025-03-05 at 01:38:42 UT +/- 0.01 min [1] Object Designation : (2984) Chaucer Orbit Class : MBA Star Designation : GDR3 0685467335809875200 Star Coordinates (ICRF) : RA = 09 01 18.4146, DE = +21 53 04.223 [2] Star Magnitudes : G = 14.25 mag, RP = 13.81 mag, BP = 14.54 mag Object Magnitude : V = 16.34 mag Estimated Magnitude Drop : 2.2 mag Estimated Max. Duration : 6.2 sec Object Mean Diameter : 27.2 km (src: astorb) Speed of the shadow : 4.4 km/s Elongation to Moon & Sun : 78° (sunlit = 32%), Sun = 146° Cross-track uncertainty : 0.7 mas = 0 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.07 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#51 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 6b634990-888d-11ef-78cd-893abf8ec3e1 [asteroids]

 Occultation Date + Time   : 2025-03-05 at 01:38:42 UT +/- 0.01 min  [1]
 Object Designation        : (2984) Chaucer
 Orbit Class               : MBA
 Star Designation          : GDR3 0685467335809875200
 Star Coordinates (ICRF)   : RA = 09 01 18.4146, DE = +21 53 04.223  [2]
 Star Magnitudes           : G = 14.25 mag, RP = 13.81 mag, BP = 14.54 mag
 Object Magnitude          : V = 16.34 mag
 Estimated Magnitude Drop  : 2.2 mag
 Estimated Max. Duration   : 6.2 sec
 Object Mean Diameter      : 27.2 km  (src: astorb)
 Speed of the shadow       : 4.4 km/s
 Elongation to Moon & Sun  : 78° (sunlit = 32%), Sun = 146°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.07 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#51

 
 [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)