Alert Notice 690: Rare Very Faint Minimum of Betelgeuse (Alpha Ori)
Active Dates: Jan. 6, 2020 – Jan. 6, 2020
Abstract:
The semiregular variable alpha Ori (alf Ori, Betelgeuse) is undergoing a very rare, very faint minimum. On behalf of numerous astronomers, the AAVSO is requesting that AAVSO observers monitor alf Ori in multiple wavelengths and obtain spectroscopy. Of particular interest are observations in V, R, H, J, and B, along with spectroscopy. Time-resolved observations (at least 2-3 observations per night) are requested. Visual observations (not more than one per night) are also welcome. PEP observers should contact AAVSO PEP Section Leader Tom Calderwood; his email address is 'tjc at cantordust dot net'.
Justification:
The semiregular variable alpha Ori is experiencing a very rare faint minimum, making it a unique opportunity for observation. The extreme brightness of the star presents a challenge in selecting suitable comparison stars, highlighting the need for detailed and careful photometric and spectroscopic observations.
Requested Data Types:
Photometry, Spectroscopy
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| alf Ori | 0.00 | SRC |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
Principal Investigator: Numerous Astronomers; Imported Campaign (Alert Notice #690)