Occultation by 40 Harmonia
Observed: 12 Nov 2007
12 Nov 2007
revided 28 Dec 2007 (GPS time uncertainty)
corrected 10 Apr 2017 (shadow size)
The minor planet 40 Harmonia was observed occulting a 10.6 mag
star. The duration of the occultation was 3.2±0.4s.
The occultation of mag 10.6 star TYC6355-01269-1 by the
asteroid 40 Harmonia on 12 Nov 2007 UT in the vicinity of my location was
predicted by S. Preston:
The observation was carried out with a 203mm f/6.3 SC telescope, a Clear
filter and a SBIG ST7E camera (KAF401E CCD). The conditions were poor
with clouds and a bad seeing. The exposure was 60s long, starting at 19:04:54
TU: I let the telescope tracks for about 10s, then I switched off the
I estimate the uncertainty on the time with my NMEA GPS as 2s (I compared
with the French Horloge Parlante 3699). Futhermore, MaximDL3 records the time
to the nearest second. The total uncertainty on the timing of the beginning of the
occultation is then +/-2.5s.
A part of the resulting image
1: the occulted star at the beginning of the exposure;
2: the beginning of the occultation;
3: its end;
4: the occulted star at the end of exposure.
My image is 0.294° and 765 pixels width. The angular distance between
2 and 4 is 6.633'+/-4pixels or 26.5+/-0.4s, then the beginning of the
occultation 2 is at 19:05:27.5 +/- 2.9 UT. The angular distance between
2 and 3 is 48.3"+/-4pixels and the duration of the occultation is 3.2+/-0.4s.
Telescope and camera configuration.
Computer and software configuration.