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Iota Delphini

Iota Delphini
Location of Iota Delphini (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension 20h 37m 49.1198s[1]
Declination +11° 22′ 39.6308″[1]
Apparent magnitude (V) 5.42±0.01[2]
Characteristics
Spectral type A1 IV[3]
U−B color index +0.03[4]
B−V color index +0.03[4]
Astrometry
Radial velocity (Rv)−3.9±0.9[5] km/s
Proper motion (μ) RA: +38.867 mas/yr[1]
Dec.: −8.609 mas/yr[1]
Parallax (π)16.6478 ± 0.0728 mas[1]
Distance195.9 ± 0.9 ly
(60.1 ± 0.3 pc)
Absolute magnitude (MV)1.62[6]
Orbit[7]
Period (P)11.039 days
Eccentricity (e)0.23
Periastron epoch (T)2422139.862
Argument of periastron (ω)
(secondary)		61.8°
Semi-amplitude (K1)
(primary)		26.0 km/s
Details
Mass2.47[8] M☉
Radius1.9[9] R☉
Luminosity23[10] L☉
Surface gravity (log g)4.29[6] cgs
Temperature9,130[10] K
Metallicity [Fe/H]−0.25[11] dex
Rotational velocity (v sin i)28[12] km/s
Age225[10] Myr
Other designations
ι Del, 5 Delphini, BD+10°4339, GC 28711, HD 196544, HIP 101800, HR 7883, SAO 106322[13]
Database references
SIMBADdata

Iota Delphini (ι Del, ι Delphini) is a star in the constellation Delphinus. It has an apparent magnitude of about 5.4, meaning that it is just barely visible to the naked eye. Based upon parallax measurements made by the Gaia spacecraft, this star is located at a distance of 196 light years.

Iota Delphini's spectral type is A1IV, meaning it is an A-type subgiant.[14] Observations of the star's spectrum reveal a periodic Doppler shift. This means that Iota Delphini is a spectroscopic binary with a period of 11 days and an eccentricity of 0.23.[7] However, almost no information is known about the companion star.

Iota Delphini appears to be an Am star,[6] also known as a metallic-line star. These types of stars have spectra indicating varying amounts of metals, like iron.[15] Observations of Iota Delphini's spectrum have showed lower amounts of calcium and higher amounts of iron than usual.[6]

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference UBV was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference stateva was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference sb9 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference derosa2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference launhardt2021 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference starhorse was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference david2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Allen, J. S. "The Classification of Stellar Spectra". UCL Department of Physics and Astronomy: Astrophysics Group. Retrieved 1 January 2014.
  15. ^ Am star Archived 2017-08-04 at the Wayback Machine, The Internet Encyclopedia of Science, David Darling. Accessed on line August 14, 2008.
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