Collaborative Occultation Resources and Archive (CORA)

Occultations | Observations | Reports | Info + Credits | JOA | Admin | Login

2022-01-26 / 4UC 395-009142 / (2204) Lyyli

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Alberto Ossola O+ VID M230 CH GPS++ 19:48:00 19:49:32.73 19:49:33.53 19:50:59 0.16 0.16 0.80 9.9
2 show Stefano Sposetti O+ CCD M420 CH GPS++ 19:46:30 19:49:33.73 19:49:35.65 19:52:30 0.04 0.04 1.92 23.8
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#59 : e0890e88-558f-4b15-93ef-510a8a9e0456 [db: observed]

Using prediction e0890e88-558f-4b15-93ef-510a8a9e0456 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 = 2340.7, 21.3 km
Circular diameter = 26 km

From 2 chords (VID,CCD)








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: 2022-01-26, 19:48 UT (JD = 2459606.325)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 20121.511.062 64°, -66° 2.449457e610149.30.0° None2018-07-19 not scaled 2018-07-18
# 20131.511.062 252°, -14° 2.449457e610149.30.0° None2018-07-19 not scaled 2018-07-18
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] : e0890e88-558f-4b15-93ef-510a8a9e0456 [observed]

 Occultation Date + Time   : 2022-01-26 at 19:43:10 UT +/- 0.07 min  [1]
 Object Designation        : (2204) Lyyli
 Orbit Class               : MBA
 Star Designation          : GDR3 3010078836712136960
 Star Coordinates (ICRF)   : RA = 05 31 35.0474, DE = -11 07 04.583  [2]
 Star Magnitudes           : G = 11.96 mag, RP = 11.22 mag, BP = 12.58 mag
 Object Magnitude          : V = 13.99 mag
 Estimated Magnitude Drop  : 2.2 mag
 Estimated Max. Duration   : 2.0 sec
 Object Mean Diameter      : 25 km  (src: astorb)
 Speed of the shadow       : 12.4 km/s
 Elongation to Moon & Sun  : 137° (sunlit = 36%), Sun = 126°
 Cross-track uncertainty   : 1.3 mas = 0 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#59

 
 [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)