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The variable star V* BO Mic is a red (K-type) flare star with outbursts of high energy (X-ray, UV) and an extraordinarily rapid rotation: its radius equaling that of our Sun, it completes a rotation in 0.38 days (instead of ~25).
The variable star V* BO Mic is a red (K-type) flare star with outbursts of high energy (X-ray, UV) and an extraordinarily rapid rotation: its radius equaling that of our Sun, it completes a rotation in 0.38 days (instead of ~25).


The nearby young star at V=9.4mag has been nicknamed "Speedy Mic" in astrophysics, because it was the fastest rotating single dwarf star known (Prot=0.38d).  
The nearby young star at V=9.4mag has been nicknamed "Speedy Mic" in astrophysics, because it was the fastest rotating single dwarf star known (Prot=0.38d). First appearance in Bromage+1992(1992ASPC...26...80B)<ref name=":0">Bromage, G. E., “Speedy Mic: A Young; Nearby; Extremely Fast Rotating K Star Discovered by the ROSAT/WFC EUV Survey”, in <nowiki><i>Cool Stars, Stellar Systems, and the Sun</i></nowiki>, 1992, vol. 26, p. 80.</ref>


There is no nebula - just a single star.  
There is no nebula - just a single star.  
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==IAU Working Group on Star Names==
==IAU Working Group on Star Names==
The name was approved by the IAU WGSN in 2026, following a SIMBAD suggestion. The name had been popular already before the adoption; it regularly appears in paper titles: first Bromage+1992(1992ASPC...26...80B), then 1993MNRAS.265..941A ,  1997IBVS.4419....1C   ,2001MNRAS.324..231B ,  2005A&A...435..261W , 2005MNRAS.364..137B , 2006MNRAS.373.1308D , 2006MNRAS.365..530D.
The name was approved by the IAU WGSN in 2026, following a SIMBAD suggestion. The name had been popular already before the adoption; it regularly appears in paper titles: first Bromage+1992(1992ASPC...26...80B)<ref name=":0" />, then 1993MNRAS.265..941A <ref>Anders, G. J., Jeffries, R. D., Kellett, B. J., and Coates, D. W., “Speedy MIC : a very young, rapidly rotating K star.”, <nowiki><i>Monthly Notices of the Royal Astronomical Society</i></nowiki>, vol. 265, OUP, pp. 941–945, 1993. doi:10.1093/mnras/265.4.941.</ref>,  1997IBVS.4419....1C<ref>Cutispoto, G., Kurster, M., Pagano, I., and Rodono, M., “UBV(RI)c Photometry of the Rapidly Rotating K-Type Star HD197890 = "Speedy Mic"”, <nowiki><i>Information Bulletin on Variable Stars</i></nowiki>, vol. 4419, p. 1, 1997.</ref>, 2001MNRAS.324..231B ,  2005A&A...435..261W , 2005MNRAS.364..137B , 2006MNRAS.373.1308D , 2006MNRAS.365..530D.


== Weblinks ==
== Weblinks ==

Latest revision as of 09:46, 9 May 2026

Authors: Susanne M Hoffmann

A V band light curve for BO Microscopii, adapted from Cutispoto et al., Information Bulletin on Variable Stars, vol 4419, January 1997
Doppler maps of the highly active star BO Mic ('Speedy Mic') at different rotation phases (indicated on top of the maps). Spot coverage is rendered as black, dark and light orange areas, representing 100%, 67% and 33% spot coverage, respectively. A few spots are near the visible pole, while most spots are asymmetrically distributed at mid-latitudes. The blue circle indicates the flare observed in October 2006 using ESO's VLT and ESA's XMM-Newton satellite. Grid lines mark latitudes and longitudes in 30 degrees steps.

Speedy Mic is a modern star name adopted by the International Astronomical Union in the IAU-Catalog of Star Names (IAU-CSN). Its origin is modern astrophysics language (English). It is the name of the star V* BO Mic in constellation Microscopium.

Concordance, Etymology, History

The variable star V* BO Mic is a red (K-type) flare star with outbursts of high energy (X-ray, UV) and an extraordinarily rapid rotation: its radius equaling that of our Sun, it completes a rotation in 0.38 days (instead of ~25).

The nearby young star at V=9.4mag has been nicknamed "Speedy Mic" in astrophysics, because it was the fastest rotating single dwarf star known (Prot=0.38d). First appearance in Bromage+1992(1992ASPC...26...80B)[1]

There is no nebula - just a single star.

Mythology

no mythology

IAU Working Group on Star Names

The name was approved by the IAU WGSN in 2026, following a SIMBAD suggestion. The name had been popular already before the adoption; it regularly appears in paper titles: first Bromage+1992(1992ASPC...26...80B)[1], then 1993MNRAS.265..941A [2],  1997IBVS.4419....1C[3], 2001MNRAS.324..231B ,  2005A&A...435..261W , 2005MNRAS.364..137B , 2006MNRAS.373.1308D , 2006MNRAS.365..530D.

Reference

  1. ↑ 1.0 1.1 Bromage, G. E., “Speedy Mic: A Young; Nearby; Extremely Fast Rotating K Star Discovered by the ROSAT/WFC EUV Survey”, in <i>Cool Stars, Stellar Systems, and the Sun</i>, 1992, vol. 26, p. 80.
  2. ↑ Anders, G. J., Jeffries, R. D., Kellett, B. J., and Coates, D. W., “Speedy MIC : a very young, rapidly rotating K star.”, <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 265, OUP, pp. 941–945, 1993. doi:10.1093/mnras/265.4.941.
  3. ↑ Cutispoto, G., Kurster, M., Pagano, I., and Rodono, M., “UBV(RI)c Photometry of the Rapidly Rotating K-Type Star HD197890 = "Speedy Mic"”, <i>Information Bulletin on Variable Stars</i>, vol. 4419, p. 1, 1997.
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