| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 29m 15.77460s[2] |
| Declination | −40° 25′ 01.3084″[2] |
| Apparent magnitude (V) | 7.0 - 14.4 [3] |
| Characteristics | |
| Spectral type | M5e-M7e[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | −54.00[5] km/s |
| Proper motion (μ) | RA: −13.68[2] mas/yr Dec.: −24.38[2] mas/yr |
| Parallax (π) | 1.5546 ± 0.1456 mas[6] |
| Distance | 2,100 ± 200 ly (640 ± 60 pc) |
| Details | |
| Luminosity | 7,900[7] L☉ |
| Temperature | 2,995[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
U Microscopii is a Mira variable star in the constellation Microscopium. It ranges from magnitude 7 to 14.4 over a period of 334 days.[4] The Astronomical Society of Southern Africa in 2003 reported that observations of U Microscopii were very urgently needed as data on its light curve was incomplete.[9]
References
[edit]- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ a b c d van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b Watson, Christopher (4 January 2010). "U Microscopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 March 2015.
- ^ Turon, C.; Creze, M.; Egret, D.; Gomez, A.; Grenon, M.; Jahreiß, H.; Requieme, Y.; Argue, A. N.; Bec-Borsenberger, A.; Dommanget, J.; Mennessier, M. O.; Arenou, F.; Chareton, M.; Crifo, F.; Mermilliod, J. C.; Morin, D.; Nicolet, B.; Nys, O.; Prevot, L.; Rousseau, M.; Perryman, M. A. C.; et al. (1993). "Version 2 of the HIPPARCOS Input Catalogue". Bull. Inf. Cent. Donnees Astron. Strasbourg 43. 43: 5. Bibcode:1993BICDS..43....5T.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Uttenthaler, S.; Lebzelter, T. (2010). "Correlation between technetium and lithium in a sample of oxygen-rich AGB variables". Astronomy and Astrophysics. 510: A62. arXiv:0911.3507. Bibcode:2010A&A...510A..62U. doi:10.1051/0004-6361/200912548. S2CID 119231142.
- ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ Cooper, Tim (2003). "Presidential address: Amateur Observations - Successes and Opportunities". Monthly Notes of the Astronomical Society of Southern Africa. 62: 234–40. Bibcode:2003MNSSA..62..234C.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction