| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 27m 25.96022s[1] |
| Declination | 52° 19′ 13.5871″[1] |
| Apparent magnitude (V) | 5.73[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1V[4] |
| B−V color index | −0.002±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | +1.90[5] km/s |
| Proper motion (μ) | RA: -12.639[1] mas/yr Dec.: -27.567[1] mas/yr |
| Parallax (π) | 8.4332 ± 0.0867 mas[1] |
| Distance | 387 ± 4 ly (119 ± 1 pc) |
| Absolute magnitude (MV) | +0.57[2] |
| Details | |
| Mass | 2.59±0.03[3] M☉ |
| Luminosity | 74.1+11.0 −20.5[6] L☉ |
| Surface gravity (log g) | 4.18[6] cgs |
| Temperature | 9,683+89 −178[3] K |
| Rotational velocity (v sin i) | 51.6±2.2[6] km/s |
| Age | 404[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota1 Cygni, Latinized from ι1 Cygni, is a probable binary star[6] system in the northern constellation Cygnus, and is separated by less than a degree from its brighter visual neighbor, Iota2 Cygni.[9] It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 5.75.[8] The system is located approximately 387 light years away based on parallax,[1] and it is drifting further away with a radial velocity of +2 km/s.[5]
This is a candidate double-lined spectroscopic binary system.[6] It has a stellar classification of A1V,[4] suggesting the primary component is an A-type main-sequence star. The star is about 400[7] million years old with a moderate rotation rate, showing a projected rotational velocity of 52 km/s.[6] It has 2.6[3] times the mass of the Sun and is radiating 74[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,683 K.[3]
References
[edit]- ^ a b c d e f 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.
- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Jaschek, M. (July 1978), "Catalogue of selected spectral types in the MK system", Bulletin d'Information du Centre de Données Stellaires, 15 (121): 121, Bibcode:1978BICDS..15..121J. Vizier catalog entry
- ^ a b Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
- ^ a b c d e f g Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, S2CID 54511685, A84.
- ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ a b "iot01 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-10.
- ^ Kaler, James B. (September 11, 2015), "Kappa, Iota, and Iota-1 Cygni, a three-for-one-special", Stars, retrieved 2019-09-10.
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