Collaborative Occultation Resources and Archive (CORA)

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

2008-04-13 / TYC 1882-00189-1 / (351) Yrsa

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Gregor Krannich O+ VIS M250 DE NTP+ 20:19:00 20:20:56.0 20:20:57.5 20:20:58 0.5 0.3 1.50 42.6
2 show Helmut Michels O+ VID M400 DE RAD++ 20:10:00 20:20:51.61 20:20:53.65 20:36:00 2.04 57.9
3 show Bernd Gaehrken O- CCD M800 DE 20:19:00 20:25:00
4 show Michael Parl O- VID M203 DE 20:18:00 20:28:00
5 show David Voglsam O- VID M500 AT 20:20:07 20:22:25
6 show Gerhard Dangl O- VID M254 AT 20:18:45 20:23:11
7 show Oliver Kloes O- VID M254 DE 20:15:15 20:25:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

7 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#66 : cecd9296-572c-460f-a078-be03f126aa79 [db: observed]

Using prediction cecd9296-572c-460f-a078-be03f126aa79 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 = 131.7, -7.2 km
Circular diameter = 81 km

From 2 chords (VID,VIS)








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: 2008-04-13, 20:19 UT (JD = 2454570.347)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 484None13.312 193°, -41° 2.450699e63871.30.0° NoneNone not scaled 2013-02-11
# 485None13.312 20°, -70° 2.450699e63871.30.0° NoneNone not scaled 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

   
Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : cecd9296-572c-460f-a078-be03f126aa79 [observed]

 Occultation Date + Time   : 2008-04-13 at 20:18:37 UT +/- 0.01 min  [1]
 Object Designation        : (351) Yrsa
 Orbit Class               : MBA
 Star Designation          : GDR3 3432127199668183808
 Star Coordinates (ICRF)   : RA = 06 17 56.7286, DE = +26 07 14.093  [2]
 Star Magnitudes           : G = 9.99 mag, RP = 9.24 mag, BP = 10.63 mag
 Object Magnitude          : V = 14.16 mag
 Estimated Magnitude Drop  : 4.2 mag
 Estimated Max. Duration   : 1.4 sec
 Object Mean Diameter      : 40 km  (src: astorb)
 Speed of the shadow       : 28.4 km/s
 Elongation to Moon & Sun  : 34° (sunlit = 62%), Sun = 70°
 Cross-track uncertainty   : 1.7 mas = 3 km = 0.08 path-width (1-sig)
 RUWE and duplicate source : 0.96 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#66

 
 [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)