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20180+1544
CHE 284

Selections

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

20180+1544 CHE 284

20^h 17^m 58.85^s +15° 43' 43.3" P.A. 339.00 sep 30.4 mag 9.45,10.13 Sp G0

Coord 2000	20180+1544		Discov num	CHE 284		Comp			Coord arcsec 2000	20 17 58.85 +15 43 43.3
Date first	1910		Date last	2015		Obs	14
Pa first	339		Pa last	339		P.A. Now (θ)	339°
Sep first	30.1		Sep last	30.4		Sep. Now (ρ)	30.4"
Mag pri	9.45		Mag sec	10.13		delta mag (ΔM)	0.68		Spectral class	G0 (yellow)
Pri motion ra	-005		Sec motion ra	-006
Pri motion dec	-006		Sec motion dec	+000
Notes

rPM=0.779

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	339.2		Precise sep	30.44		Constellation	Delphinus		Tycho2	1631-00281-1
Gaia DR2	1808394678614524544		HD	355374

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20180+1544	CHE 284		1998	3	339	30.3	9.45	10.13		D	201758.85+154343.3
20180+1544	CHE 284		2008	4	339	30.1	9.45	10.13		D	201758.85+154343.3
20180+1544	CHE 284		2013	8	340	30.0	9.45	10.13			201758.85+154343.3
20180+1544	CHE 284		2015	10	339	30.3	9.45	10.13	G0		201758.85+154343.3

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