fbpx
Wikipedia

Siriometer

February 23, 2024

The siriometer is an obsolete astronomical unit of length, defined to be equal to one million astronomical units (au).[1][2] One siriometer is approximately 149.6 petametres; 4.848 parsecs; 15.81 light-years. The distance from Earth to the star Sirius is then approximately 0.54 siriometers.[3]

The unit was proposed in 1911 by Carl V. L. Charlier,[3] who worked on stellar statistics.[4] Charlier originally used the symbol 'sir'[1] but the symbol 'Sm' has also seen use.[5]

The siriometer never gained widespread usage. Frank Dyson (the Astronomer Royal) objected to the name siriometer, because "it suggests a machine for measuring".[6] The first General Assembly of the International Astronomical Union in 1922 adopted the parsec as the standard unit of stellar distances,[7] which simplified the definition of absolute magnitude.[3] Use of the siriometer seems to have disappeared from the astronomical literature by c. 1930.[3] Modern professional astronomers use the parsec as their primary unit for distances larger than the Solar System.

Further reading edit

  • Arenou, Frédéric. "The origin of the parsec". Paris Observatory. Retrieved 18 May 2018.

References edit

  1. ^ a b Charlier, C. V. L. (1921). Lectures on Stellar Statistics. Bibcode:1921lss..book.....C.
  2. ^ Charlier, C. V. L. (May 1913). "An Investigation on the Motion of the Stars". Monthly Notices of the Royal Astronomical Society. 73 (7): 486–492. Bibcode:1913MNRAS..73..486C. doi:10.1093/mnras/73.7.486. I have used ... the term "Siriometer" for denoting a distance equal to a million times the mean distance of the Sun from the Earth.
  3. ^ a b c d Beech, Martin (2008). "The reluctant parsec and the overlooked light-year". The Observatory. 128: 489. Bibcode:2008Obs...128..489B.
  4. ^ "Astronomy in Sweden 1860-1940". www.astro.uu.se. Retrieved 2021-02-28.
  5. ^ "units". nrc-cnrc.github.io. Retrieved 2023-03-31.
  6. ^ "Meeting of the Royal Astronomical Society. Friday, 1913 March 14". The Observatory. 36 (460): 160. April 1913. Bibcode:1913Obs....36..160.
  7. ^ Malmquist, K. G. (1925). "On the units of distance in stellar astronomy". The Observatory. 48: 142. Bibcode:1925Obs....48..142M.


 

This astronomy-related article is a stub. You can help Wikipedia by expanding it.

February 23, 2024
siriometer, siriometer, obsolete, astronomical, unit, length, defined, equal, million, astronomical, units, siriometer, approximately, petametres, parsecs, light, years, distance, from, earth, star, sirius, then, approximately, siriometers, unit, proposed, 191. The siriometer is an obsolete astronomical unit of length defined to be equal to one million astronomical units au 1 2 One siriometer is approximately 149 6 petametres 4 848 parsecs 15 81 light years The distance from Earth to the star Sirius is then approximately 0 54 siriometers 3 The unit was proposed in 1911 by Carl V L Charlier 3 who worked on stellar statistics 4 Charlier originally used the symbol sir 1 but the symbol Sm has also seen use 5 The siriometer never gained widespread usage Frank Dyson the Astronomer Royal objected to the name siriometer because it suggests a machine for measuring 6 The first General Assembly of the International Astronomical Union in 1922 adopted the parsec as the standard unit of stellar distances 7 which simplified the definition of absolute magnitude 3 Use of the siriometer seems to have disappeared from the astronomical literature by c 1930 3 Modern professional astronomers use the parsec as their primary unit for distances larger than the Solar System Further reading editArenou Frederic The origin of the parsec Paris Observatory Retrieved 18 May 2018 References edit a b Charlier C V L 1921 Lectures on Stellar Statistics Bibcode 1921lss book C Charlier C V L May 1913 An Investigation on the Motion of the Stars Monthly Notices of the Royal Astronomical Society 73 7 486 492 Bibcode 1913MNRAS 73 486C doi 10 1093 mnras 73 7 486 I have used the term Siriometer for denoting a distance equal to a million times the mean distance of the Sun from the Earth a b c d Beech Martin 2008 The reluctant parsec and the overlooked light year The Observatory 128 489 Bibcode 2008Obs 128 489B Astronomy in Sweden 1860 1940 www astro uu se Retrieved 2021 02 28 units nrc cnrc github io Retrieved 2023 03 31 Meeting of the Royal Astronomical Society Friday 1913 March 14 The Observatory 36 460 160 April 1913 Bibcode 1913Obs 36 160 Malmquist K G 1925 On the units of distance in stellar astronomy The Observatory 48 142 Bibcode 1925Obs 48 142M nbsp This astronomy related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Siriometer amp oldid 1170170397, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.