Rho1 Sagittarii

ρ¹ Sagittarii

Template:Location mark Location of ρ1 Sagittarii (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Sagittarius
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	3.93
Characteristics
Spectral type	A9IV
U−B Template:Engvar	+0.14
B−V Template:Engvar	+0.22
Variable type	δ Sct
Astrometry
Radial velocity (Rv)	+1.20 km/s
Proper motion (μ)	RA: −25.87 mas/yr Dec.: +21.46 mas/yr
Parallax (π)	25.69±0.19 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	0.97
Details
Mass	1.91 Template:Solar mass
Radius	Template:Solar radius
Luminosity	Template:Solar luminosity
Surface gravity (log g)	3.89 cgs
Temperature	K
Metallicity [Fe/H]	−0.02 dex
Rotational velocity (v sin i)	68 km/s
Age	893 Myr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

Rho¹ Sagittarii, Latinized from ρ¹ Sagittarii, is a single, variable star in the southern constellation of Sagittarius. It has a white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 3.93. The distance to this star is approximately 127 light years based on parallax, and it is drifting further away with a radial velocity of +1.2 km/s. It is positioned near the ecliptic and so it can be occulted by the Moon.

This object has a stellar classification of A9IV, matching a subgiant star that is evolving away from the main sequence. It is a low amplitude Delta Scuti variable, ranging from 3.94 to 3.90 magnitude with a period of 0.05 days. The star is 893 million years old and is spinning with a projected rotational velocity of 68 km/s. It has 1.9 times the mass of the Sun and 3.3 times the Sun's radius. The star is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 7,469 K.