98 Aquarii

This article is about b1 Aquarii. For other star systems with this Bayer designation, see b Aquarii.
98 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Location of 98 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 22m 58.22606s[1]
Declination –20° 06′ 02.0963″[1]
Apparent magnitude (V) +3.97[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.948[2]
B−V color index +1.089[2]
Astrometry
Radial velocity (Rv)–6.5[4] km/s
Proper motion (μ) RA: –121.28[1] mas/yr
Dec.: –97.59[1] mas/yr
Parallax (π)19.96 ± 0.23 mas[1]
Distance163 ± 2 ly
(50.1 ± 0.6 pc)
Details
Mass2.1[5] M☉
Radius14[6] R☉
Surface gravity (log g)2.4[5] cgs
Temperature4,630[5] K
Metallicity [Fe/H]–0.30[5] dex
Other designations
BD–20 6587, FK5 1612, HD 220321, HIP 115438, HR 8892, SAO 191858.[7]
Database references
SIMBADdata

98 Aquarii (abbreviated 98 Aqr) is a star in the equatorial constellation of Aquarius. 98 Aquarii is the Flamsteed designation, although it also bears the Bayer designation b1 Aquarii. It is visible to the naked eye with an apparent visual magnitude of +3.97.[2] The distance to this star, 163 light-years (50 parsecs), is known from parallax measurements made with the Hipparcos spacecraft.[1]

With over double the mass of the Sun,[5] this is an evolved giant star that has a stellar classification of K0 III.[3] The measured angular diameter of this star is 2.54 ± 0.13 mas.[8] At the estimated distance of 98 Aquarii,[1] this yields a physical size of about 14 times the radius of the Sun.[6] The expanded outer envelope has an effective temperature of 4,630 K,[5] giving it the orange glow of a K-type star.[9]

  1. ^ a b c d e f g Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference aaa439_1_227 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa431_773 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).