| Occultation Observation (Status: review in progress !) |
|
Occultation Date : 2025-02-04
Star Designation : TYC 1374-00601-1
Object Designation : (4176) Sudek
Observation Result : O+
Observer(s) : Tomas Janik, Zdenek Moravec
Start Observation UT1 : 22:32:00
Disappearance UT2 : 22:32:43.12 +/- 0.03
Reappearance UT3 : 22:32:43.69 +/- 0.03
End Observation UT4 : 22:33:30
Duration [sec] : 0.57
Site Name : Teplice
Country Code : CZ
Observation Method : CCD
Time Source : GPS
Instrument/Optics : T600
Record last modified : 2025-02-13 20:16:44
Source / Reference : SODIS (account required)
Observer Comments : Observed exceptionally clear diffraction effects for both D and R. Nice and smooth light curve - very good SNR. Possible binary star - a step observed before R.
Since Peter Delincak (SODIS ID 7114) did not observe any gradual brightening/fading during the occultation using the same exposure (0.05 s), we believe the "step" during R is not caused by a star companion. We think the effect was caused by an irregular shape of the asteroid and that such an explanation is more likely.
Measurement by AOTA: data points related to diffraction effects were invalidated (these points are not used for D/R measurement).
Magnitude drop of 2.59mag (9.2 % with respect to the full intensity) for measured occultation, magnitude drop of 0.51mag (62.7 % with respect to the full intensity) for "step" near the R. Brightening of -0.25mag (125 % with respect to the full intensity) for diffraction effects at both D and R.
|
Associated Occultation
Images and Datafiles
(If error 404: link not valid which means no data available)
| Notes |
|---|
- For the used data sources and all abbrerviations / codes used above look here.
|