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1999-09-18 / TYC 1882-00999-1 / (110) Lydia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Patrick Degrelle O+ VIS M153 FR RAD++ 00:45:23 00:58:01.8 00:58:05.2 01:10:21 0.2 0.1 3.40 72.1
2 show Lex Blommers O+ VIS L266 NL RAD++ 00:52 00:58:09.42 00:58:11.10 01:07 0.5 0.3 1.68 35.6
3 show F.J. Sevilla O- M170 ES 00:45:00 01:52:00
4 show F.R. Van Loo O- VIS M250 BE 00:50:00 01:05:20
5 show Hazel McGee O- VIS M305 UK 00:51:00 01:07:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

5 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#112 : afb741a9-36ad-43cd-b3af-4a1e8a31154a [db: observed]

Using prediction afb741a9-36ad-43cd-b3af-4a1e8a31154a 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 = 316.1, 29.2 km
Circular diameter = 75 km

From 2 chords (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: 1999-09-18, 00:58 UT (JD = 2451439.540)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 152None10.926 149°, -55° 2.436494e614945.50.0° None2010-05-27 91.0 +/- 1.0 km 2009-02-26
# 153None10.926 331°, -61° 2.436494e614945.50.0° None2010-05-27 95.5 +/- 1.5 km 2009-02-26
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] : afb741a9-36ad-43cd-b3af-4a1e8a31154a [observed]

 Occultation Date + Time   : 1999-09-18 at 01:00:57 UT +/- 0.02 min  [1]
 Object Designation        : (110) Lydia
 Orbit Class               : MBA
 Star Designation          : GDR3 3431760336444612992
 Star Coordinates (ICRF)   : RA = 06 23 05.6418, DE = +25 05 10.803  [2]
 Star Magnitudes           : G = 10.11 mag, RP = 9.44 mag, BP = 10.63 mag
 Object Magnitude          : V = 13.25 mag
 Estimated Magnitude Drop  : 3.2 mag
 Estimated Max. Duration   : 4.1 sec
 Object Mean Diameter      : 86 km  (src: astorb)
 Speed of the shadow       : 21.2 km/s
 Elongation to Moon & Sun  : 170° (sunlit = 52%), Sun = 79°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.89 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#112

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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