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Doubles in session

Current system

20179+1520
SMA 116

Selections

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Binocular doubles
Binary Systems
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20179+1520 SMA 116

20^h 17^m 53.73^s +15° 19' 43.8" P.A. 159.00 sep 9.7 mag 11.53,14.22

Coord 2000	20179+1520		Discov num	SMA 116		Comp			Coord arcsec 2000	20 17 53.73 +15 19 43.8
Date first	1921		Date last	2015		Obs	10
Pa first	150		Pa last	159		P.A. Now (θ)	159°
Sep first	8.9		Sep last	9.7		Sep. Now (ρ)	9.7"
Mag pri	11.53		Mag sec	14.22		delta mag (ΔM)	2.69		Spectral class
Pri motion ra	-010		Sec motion ra
Pri motion dec	-001		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	159.1		Precise sep	9.657		Constellation	Delphinus		SAO	105936
Gaia DR2	1808343516962945152

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20179+1520	SMA 116		2008	4	160	9.8	11.53	14.22		N D	201753.73+151943.8
20179+1520	SMA 116		2010	6	160	9.2	11.53	14.22		N	201753.73+151943.8
20179+1520	SMA 116		2015	6	159	9.7	11.53	14.22		N	201753.73+151943.8

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