Observation by Tim Haymes: (22) Kalliope occults a 13th mag star in...

Uploaded by

Tim Haymes

Observer

Tim Haymes

Observed

2022 Apr 15 - 21:08

Uploaded

2022 Apr 17 - 21:46

Objects

22 Kalliope
Lightcurve

Equipment
  • C11 at F/6
  • QHY174mGPS
  • SharpCap
Exposure

200ms ( 5fps)

Location

N Oxfordshire

Target name

(22) Kalliope and UCAC4 621-038470

Title

(22) Kalliope occults a 13th mag star in Gemini

About this image

This observation of (22) Kalliope (m 11.7) was aimed at recording a small drop in brightness as the main body passed over the fainter star.  The drop was predicted to be 0.3 magnitudes for 7 seconds.  The SER video recording had a dip with a duration of 4.56 sec +/- 0.2.  So the observation was positive.  I was situated near the center of the shadow as it passed across England. (prediction from OccultWatcher)

The observed mid-time was 2108h 41.43s.  Prediction was 2108h 40s.  Prediction quality has improved significantly over the last few years owing to the Gaia data releases.

In the picture above, we have a light curve and two comparison stars, and on the left is a frame indication the field of view. At the top is the shadow-strip indicating the position of observers within the path.  Good weather played a vital part in allowing observers to record the event including colleagues in Europe.

See this analysis (url updated) by E.Frappa which fits the observations to a model of the asteroid. https://euraster.net/results/2022/20220415-Kalliope_crd+ISAM-A22-3.gif

The Asteroids and Remote Planets Section invites more observers to catch these momentary events. A more typical prediction involves the complete disappearance of a star, such as this example from Alex.

 

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.