Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 74991


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Small Amplitude Red Variables in the AAVSO Photoelectric Program: Light Curves and Periods
Small-amplitude red variables (SARVs) are M giants or supergiants whichare pulsating with small amplitudes (up to 2.5 mag) and with time scalesof 20 to 200 days or more. This paper reports on a ten-year study ofabout two dozen SARVs, carried out through the American Association ofVariable Star Observers (AAVSO) photoelectric photometry program. It hasprovided detailed information on the regularity, period and amplitude ofthese stars. Most have well-defined periods in the 20 to 200 day range.Several also have a long secondary period. One (W Boo) appears to havetwo periods with a ratio of 2.3. (SECTION: Stars)

Mitteilungen uber Veraenderliche des Bamberger Liste.
Not Available

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Ύδρα
Right ascension:08h46m45.55s
Declination:-18°45'28.2"
Apparent magnitude:6.599
Distance:158.228 parsecs
Proper motion RA:8.8
Proper motion Dec:-7.5
B-T magnitude:7.922
V-T magnitude:6.709

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 74991
TYCHO-2 2000TYC 6020-1111-1
USNO-A2.0USNO-A2 0675-09630396
HIPHIP 43108

→ Request more catalogs and designations from VizieR