98 Aquarii

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98 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg

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[1] mas
Distance 163 ± 2 ly
(50.1 ± 0.6 pc)
Details
Mass 2.1[5] M☉
Radius 14[6] R☉
Surface gravity (log g) 2.4[5] cgs
Temperature 4,630[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]

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]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.. The radius (R*) is given by:
    \begin{align} 2\cdot R_* & = \frac{(50.1\cdot 2.54\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 27.4\cdot R_{\bigodot} \end{align}
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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