1 Lacertae

1 Lacertae
Location of 1 Lacertae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lacerta
Right ascension 22h 15m 58.17690s[1]
Declination +37° 44′ 55.4468″[1]
Apparent magnitude (V) 4.15[2]
Characteristics
Spectral type K3 II-III[3]
U−B color index +1.70[2]
B−V color index +1.43[2]
Astrometry
Radial velocity (Rv)−8.58[4] km/s
Proper motion (μ) RA: +8.851[1] mas/yr
Dec.: –0.089[1] mas/yr
Parallax (π)4.8108 ± 0.1322 mas[1]
Distance680 ± 20 ly
(208 ± 6 pc)
Absolute magnitude (MV)−2.61+0.27
−0.24[5]
Details[6]
Mass4.16±0.28 M☉
Radius69.01+3.32
−3.07 R☉
Luminosity1,453±147 L☉
Surface gravity (log g)2.15 cgs
Temperature4,288±62 K
Metallicity [Fe/H]−0.01 dex
Rotational velocity (v sin i)10[7] km/s
Age170±30 Myr
Other designations
1 Lac, NSV 25864, BD+37°4526, HD 211388, HIP 109937, HR 8498, SAO 72191[8]
Database references
SIMBADdata
1 Lacertae in optical light

1 Lacertae is a solitary[9] star in the northern constellation of Lacerta. It is visible to the naked eye with an apparent visual magnitude of 4.15. Based upon measurements by the Hipparcos spacecraft, this star is located at a distance of roughly 680 light years. It is moving closer to the Earth with a heliocentric radial velocity of −8.6 km/s.

A stellar classification of K3 II-III[3] suggests this is an evolved giant star/bright giant hybrid. It is 170 million years old with around four times the mass of the Sun and has expanded to an estimated 69 times the Sun's radius. The star is radiating 1,453 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,288 K, giving it the orange-hued glow of a K-type star.[10] The star was once a suspected variable, but this was later rescinded.[11]

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  2. ^ a b c Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference apj121_118 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
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  6. ^ Cite error: The named reference Baines2017 was invoked but never defined (see the help page).
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  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
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  11. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).