| 词条 | BL Crucis |
| 释义 |
|name = BL Crucis }}{{Starbox observe |epoch = J2000 |ra = {{RA|12|27|28.88}} |dec = {{DEC|-58|59|30.4}} |appmag_v = 5.38 |constell = Crux }}{{Starbox character |class = M4-5III |b-v = |u-b = |r-i = |v-i = |variable = semiregular variable }}{{Starbox astrometry |radial_v = 71.7 ± 0.9 |prop_mo_ra = -20.027 ± 0.301[1] |prop_mo_dec = 3.586 ± 0.268 [1] |parallax = 6.8429 | p_error = 0.1942 |parallax_footnote=[1] |dist_ly = |dist_pc = |absmag_v = }}{{Starbox catalog |names = HD 108396, HIP 60781, HR 4739, SAO 239960, CD−58° 4560 }}{{Starbox reference |Simbad=BL+Cru }}{{Starbox end}}BL Crucis is a red giant and a semiregular variable in the constellation of Crux.[2] It has periods with three frequencies of 30.7, 42.3 and 43.6 days. It is 480 ± 10 light-years distant from Earth.[1] References1. ^1 2 3 {{cite DR2|6059249774298155520}} 2. ^{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=10857 |title=BL Crucis |author =Watson, Christopher |date=25 August 2009 |work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=20 July 2014}} }} External links
8 : Crux (constellation)|Semiregular variable stars|M-type giants|Objects with variable star designations|Henry Draper Catalogue objects|HR objects|Durchmusterung objects|Hipparcos objects |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。