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BM Aquarii

BM Aquarii Facts

  • BM Aquarii is a pulsating giant star that can be located in the constellation of Aquarius. The description is based on the spectral class.
  • BM Aquarii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M3III:) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -5177.20 light years away from us. Distance

BM Aquarii's Alternative Names

HIP109165 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD209879.

BM Aquarii has alternative name(s) :- , BM Aqr.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-16 6021.

More details on objects' alternative names can be found at Star Names .

Location of BM Aquarii

The location of the giant star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. For BM Aquarii, the location is 22h 06m 44.98 and -15° 38` 40.0 .

Physical Properties of BM Aquarii

BM Aquarii Colour and Temperature

Based on the star's spectral type of M3III: , BM Aquarii's colour and type is red giant star. The star has a B-V Colour Index of 1.54 which means the star's temperature is about 3,913 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BM Aquarii Apparent and Absolute Magnitudes

BM Aquarii has an apparent magnitude of 9.87 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to BM Aquarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.63000 which gave the calculated distance to BM Aquarii as -5177.20 light years away from Earth or -1587.30 parsecs. If you want that in miles, it is about -30,434,819,282,046,185.69, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of BM Aquarii

The star is a pulsating Semiregular late- (M variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. BM Aquarii brightness ranges from a magnitude of 10.211 to a magnitude of 9.682 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 days (variability).

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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Additional BM Aquarii Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBM Aquarii
Alternative NamesHD 209879, HIP 109165, BD-16 6021, BM Aqr
Spectral TypeM3III:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationAquarius
Visual / Apparent Magnitude9.87
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)22h 06m 44.98
Declination (Dec.)-15° 38` 40.0
Galactic Latitude-50.18101973 degrees
Galactic Longitude41.05825354 degrees
Distance from Earth-0.63000 Parallax (milliarcseconds)
 -5177.20 Light Years
 -1587.30 Parsecs
 -327,401,845.59 Astronomical Units
B-V Index1.54
Radial Velocity-21.00000 ± 4.70 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M
Mean Variability Period in Days0.480
Variable Magnitude Range (Brighter - Dimmer)9.682 - 10.211

Estimated Calculated Facts


Effective Temperature3,913 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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