16 Persei

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16 Persei
Perseus constellation map.svg
Red circle.svg
Location of 16 Persei (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Perseus
Right ascension 02h 50m 35.05979s [1]
Declination 38° 19 07.1080 [1]
Apparent magnitude  (V)4.22 [2]
Characteristics
Spectral type F2III [3]
U−B color index +0.08 [4]
B−V color index +0.34 [4]
Variable type δ Sct(?) [5] [6]
Astrometry
Radial velocity (Rv)+14.00 [7]  km/s
Proper motion (μ)RA: +195.77 [1]   mas/yr
Dec.: −109.98 [1]   mas/yr
Parallax (π)27.01 ± 0.19  mas [1]
Distance 120.8 ± 0.8  ly
(37.0 ± 0.3  pc)
Absolute magnitude  (MV)1.38 [2]
Details
Mass 1.80 [8]   M
Radius 3.2 [9]   R
Luminosity 23.36 [2]   L
Surface gravity (log g)3.72 [10]   cgs
Temperature 7,004 [10]   K
Metallicity [Fe/H]−0.04 [2]   dex
Rotational velocity (v sin i)149 [3]  km/s
Age 1.44 [8]   Gyr
Other designations
16 Per, NSV  956, BD+37°646, FK5  2194, GC  3401, HD  17584, HIP  13254, HR  840, SAO  55928, CCDM J02506+3818A, LTT  10924 [11]
Database references
SIMBAD data

16 Persei is a single, [12] suspected variable star [6] in the northern constellation of Perseus, located approximately 121 light years away based on parallax. [1] It is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of 4.22. [2] This object is moving further from the Earth with a heliocentric radial velocity of +14 km/s. [7] It displays a relatively high proper motion, traversing the celestial sphere at the rate of 0.224 per year. [13]

A light curve for 16 Persei, plotted from TESS data 16PerLightCurve.png
A light curve for 16 Persei, plotted from TESS data

Based upon a stellar classification of F2 III, [3] this matches an aging giant star that has exhausted the hydrogen at its core and is evolving away from the main sequence. It is a possible pulsating Delta Scuti variable, although there is some uncertainty about this classification. [6] However, Kunzli and North (1998) found no variation. [15] The star is 1.44 [8]  billion years old with 1.8 [8] times the mass of the Sun and 3.2 [9] times the Sun's radius. It shows a high rotation rate with a projected rotational velocity of 149 km/s, [3] which is causing an equatorial bulge that is an estimated 24% larger than the polar radius. [16] 16 Persei is radiating 23 [2] times the Sun's luminosity from its photosphere at an effective temperature of 7,004 K. [10]

It has two reported visual companions: B, with magnitude 12.8 and separation 76.7", and C, with magnitude 10.43 and separation 234". [17]

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<span class="mw-page-title-main">42 Persei</span> Binary star system in the constellation Perseus

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<span class="mw-page-title-main">31 Persei</span> Star in the constellation Perseus

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References

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