Collaborative Occultation Resources and Archive (CORA)

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

2018-09-23 / 4UC 461-131617 / (2875) Lagerkvist

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Peter Tickner O+ CCD M300 UK GPS 22:02:01 22:04:18.21 22:04:18.76 22:06:02 0.04 0.06 0.55 7.5
2 show Tim Haymes O+ VID M300 UK GPS++ 22:03:37 22:04:19.86 22:04:20.46 22:06:30 0.04 0.06 0.60 8.2
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#56 : 3c442275-8c97-4b20-8e8a-c149355fa966 [db: observed]

Using prediction 3c442275-8c97-4b20-8e8a-c149355fa966 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:
Circular profile fit was not successful ...








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: 2018-09-23, 22:03 UT (JD = 2458385.419)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 43651.05.627 343°, -81° 2.448157e610228.40.0° None2019-09-26 not scaled 2019-05-07
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] : 3c442275-8c97-4b20-8e8a-c149355fa966 [observed]

 Occultation Date + Time   : 2018-09-23 at 22:03:56 UT +/- 0.01 min  [1]
 Object Designation        : (2875) Lagerkvist
 Orbit Class               : MBA
 Star Designation          : GDR3 2646733330842353664
 Star Coordinates (ICRF)   : RA = 23 39 13.6439, DE = +02 08 59.869  [2]
 Star Magnitudes           : G = 11.2 mag, RP = 10.7 mag, BP = 11.53 mag
 Object Magnitude          : V = 16.7 mag
 Estimated Magnitude Drop  : 5.5 mag
 Estimated Max. Duration   : 0.8 sec
 Object Mean Diameter      : 11 km  (src: astorb)
 Speed of the shadow       : 13.7 km/s
 Elongation to Moon & Sun  : 12° (sunlit = 99%), Sun = 174°
 Cross-track uncertainty   : 2.3 mas = 3 km = 0.31 path-width (1-sig)
 RUWE and duplicate source : 1.64 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#56

 
 [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)