Mirach

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Star
Mirach (β Andromedae)
NGC 404, "The Ghost of Mirach" .jpg
Mirach and the outshone galaxy NGC 404
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Andromeda
Right ascension 01 h 09 m 43.9 s
declination + 35 ° 37 ′ 14 ″
Apparent brightness 2.07 mag
Typing
B − V color index +1.58 
U − B color index +1.96 
R − I index +1.00 
Spectral class M0 III
Astrometry
Radial velocity (+0.1 ± 0.2) km / s
parallax (16.52 ± 0.56)  mas
distance (197 ± 7)  ly
(60.5 ± 2.1)  pc  
Visual absolute brightness M vis −1.8 mag
Proper movement 
Rec. Share: (+175.90 ± 0.60)  mas / a
Dec. portion: (−112.20 ± 0.46)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name β Andromedae
Flamsteed name 43 Andromedae
Bonn survey BD + 34 ° 198
Bright Star Catalog HR 337 [1]
Henry Draper Catalog HD 6860 [2]
Hipparcos catalog HIP 5447 [3]
SAO catalog SAO 54471 [4]
Tycho catalog TYC 2286-1329-1 [5]
2MASS catalog 2MASS J01094391 + 3537137 [6]
Other names Mirach, FK5  42

Mirach (derived from Arabic via mirat مئزر, DMG miʾzar  'apron') is the name of the star β Andromedae (Beta Andromedae ). Mirach has an apparent magnitude of +2.1 mag and is about 200 light years away (Hipparcos database). Mirach is a red giant of the M0 III spectral type with a surface temperature of around 3300 Kelvin .

The five-star row with Mirach in the middle

Mirach not only forms the center of the constellation Andromeda , but also the striking five-star row that can be seen in the starry sky of the northern hemisphere almost all year round.

From Mirach 7–8 ° to the northwest stands the well-known Andromeda Nebula (M31), the large neighboring galaxy of our Milky Way, which is mostly visible to the naked eye. With " Starhopping " you can easily find it via the two stars on the right above Mirach.

Furthermore, Mirach is also pretty much in the middle if you draw a line from Andromeda to the Triangle Nebula (M33). In addition, Mirach outshines the galaxy NGC 404 .

See also

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ estimated based on the apparent brightness and distance