Object: (124) Alkeste
Target Star: TYC 1321-00317-1
Event Date: 2015 March 22 UT
Observation Window: 03:02 – 03:06 UT
RA: 06:05:04.9 (J2000)
Star Magnitude: 11.9
Magnitude Drop: 1.7 (NOTE: this is mag drop for occultation, not appulse)
Star Altitude: 67 degrees SW
Moon Distance: 66 degrees
Moon Phase: 4%
Viewed from Kingman, (124) Alkeste will pass very close by the target star. This is called an appulse rather than an occultation because the main belt asteroid will come close to but not fully occult the target star.
This is a practice campaign for RECON participants attending the Kingman workshop. As a demonstration for the group, we will sign up for the event as a single group on Occult Watcher.
Either before or after the event, you should make a short recording of your position information using the switch on the front of the IOTA-VTI box. Adjust the switch to POSITION, record the screen showing your latitude/longitude for 3-5 seconds, and then adjust the switch back to TIME.
Thank you for keeping track of your observations using the RECON Observation Logsheet
Star Training Set
Star training set for Alkeste, 2015/03/22 03:01 UT Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:25 0.4 13.17 64 Alhena 06:37:42.8 +16:23:57 1.9 8.69 74 62Chi2Ori 06:03:55.2 +20:08:18 4.5 0.35 66 PPM 095290 06:03:06.9 +20:35:11 7.7 0.51 65 PPM 095360 06:05:16.8 +20:27:59 9.4 0.12 66 Alkeste 06:05:04.9 +20:21:39 13.4 66 0.04
The following chart was generate using the AAVSO Variable Star Plotter, plotted to show field in camera when using a diagonal. North is up on diagram.
Images of Star Field
The following star field image was provided by Marc Buie. Additional images are welcome!
Here’s another version in which we have inverted brightness and rotated so north is up.
Following the event, please let us know how it went using our event reporting form.