HR 6679 (HIP 87782)

HR 6679 is a white main-sequence star in the constellation Sagittarius. At 323 light years away, it shines at an apparent visual magnitude of 6.47. It is moving through the Galaxy at a speed of 13.3 km/s relative to the Sun.

Sky position: RA 17h 55.9m, Dec -18° 48.1'

Common designations: HR 6679, HD 163245, HIP 87782, Gaia DR3 4119588770476941312

HR 6679 has the spectral type A1V. A-type stars are white stars with surface temperatures of roughly 7,500 to 10,000 K. Their spectra are dominated by strong hydrogen lines, and many of them rotate rapidly. Its luminosity class V means it is a main-sequence (dwarf) star, still fusing hydrogen into helium in its core like the Sun.

How to find HR 6679 in the sky

HR 6679 lies in Sagittarius. With a declination of -18° 48.1', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 71° N. It is just beyond naked-eye visibility; binoculars will show it easily. It is highest in the sky at local midnight around July, which makes the weeks around that month the best time to observe it.

Tabulated data for HR 6679

Astrometry and spectroscopy

Right Ascension (J2000)	268.97904436° (17h 55.9m)
Declination (J2000)	-18.80215604° (-18° 48.1')
Galactic Longitude	9.91575140°
Galactic Latitude	3.16132986°
Proper motion RA	14.59 mas/yr
Proper motion Dec	-20.86 mas/yr
Parallax	10.10 ± 0.03 mas
Spectral Type	A1V
Radial Velocity	5.78 km/s

Photometry

Band	Magnitude	Abs. Mag.
B	6.53	1.55
V	6.47	1.49
J	6.32	1.34
H	6.35	1.37
K	6.30	1.32

Colour index B-V: +0.06

Derivations

Heliocentric distance: 99.04 pc (323 light years) (0.3% margin of error)
Absolute visual magnitude: 1.49
Transverse velocity: 12.0 km/s
Space velocity relative to the Sun: 13.3 km/s
Galactic position (X, Y, Z): 97.4 pc, 17.0 pc, 5.5 pc
Galactic velocity (U, V, W): 7.1 km/s, -3.9 km/s, -10.5 km/s

Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.