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20159+4257
ROE 42

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

20159+4257 ROE 42

20^h 15^m 54.16^s +42° 56' 34.4" P.A. 91.00 sep 6.1 mag 10.68,11.06

Coord 2000	20159+4257		Discov num	ROE 42		Comp			Coord arcsec 2000	20 15 54.16 +42 56 34.4
Date first	1892		Date last	2016		Obs	20
Pa first	94		Pa last	91		P.A. Now (θ)	91°
Sep first	6.0		Sep last	6.1		Sep. Now (ρ)	6.1"
Mag pri	10.68		Mag sec	11.06		delta mag (ΔM)	0.38		Spectral class
Pri motion ra	+004		Sec motion ra	+005
Pri motion dec	-008		Sec motion dec	-008
Notes

rPM=0.106 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	91.2		Precise sep	6.051		Constellation	Hydra		Tycho2	3159-00956-2
Gaia DR2	2080822942373675392

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20159+4257	ROE 42		2006	7	92	6.0	10.68	11.06		D	201554.16+425634.4
20159+4257	ROE 42		2007	14	91	6.0	10.68	11.06			201554.16+425634.4
20159+4257	ROE 42		2010	15	93	4.8	10.68	11.06			201554.16+425634.4
20159+4257	ROE 42		2015	15	91	6.1	10.68	11.06			201554.16+425634.4

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