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16408-7218
HDO 255

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

16408-7218 HDO 255

16^h 40^m 47.44^s -72° 17' 58.6" P.A. 253.00 sep 2.4 mag 6.67,10.60 Sp G8III dist. 124.53 pc (406.22 l.y.)

Coord 2000	16408-7218		Discov num	HDO 255		Comp			Coord arcsec 2000	16 40 47.44 -72 17 58.6
Date first	1897		Date last	1991		Obs	5
Pa first	235		Pa last	253		P.A. Now (θ)	253°
Sep first	2.8		Sep last	2.4		Sep. Now (ρ)	2.4"
Mag pri	6.67		Mag sec	10.60		delta mag (ΔM)	3.93		Spectral class	G8III (yellow)
Pri motion ra	+020		Sec motion ra	+018
Pri motion dec	+030		Sec motion dec	+028
Notes

rPM=0.078 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	252.7		Precise sep	2.37		Constellation	Apus		SAO	257421
HIP	81653		Tycho2	9282-02463-1		Gaia DR2	5806046436959859072		HD	149392
CP	CP-72 1971		Distance	124.53		Distance ly	406.22

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16408-7218	HDO 255		1991	5	253	2.4	6.67	10.60	G8III	D	164047.44-721758.6

If you need more information about this double, apply for a data request form to the WDS.