12266-6306 DUN 252 AC

Coord 2000	12266-6306		Discov num	DUN 252		Comp	AC		Coord arcsec 2000	12 26 35.94 -63 05 56.6
Date first	1750		Date last	2020		Obs	36
Pa first	216		Pa last	202.5		P.A. Now (θ)	202.5°
Sep first	92.5		Sep last	88.974		Sep. Now (ρ)	88.974"
Mag pri	1.25		Mag sec	4.80		delta mag (ΔM)	3.55		Spectral class	B4IV (blue-white)
Pri motion ra	-035		Sec motion ra	-038
Pri motion dec	-015		Sec motion dec	-015
Notes	N (See Notes)

rPM=0.073 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Acrux	251904	12 26 36 -63 05 57	DUN 252 AB	2020	103	111	3.5	1.25	1.55	0.30
Show		251904	12 26 36 -63 05 57	DUN 252 AC	2020	36	203	89.0	1.25	4.80	3.55		<===
Show		251904	12 26 36 -63 05 57	ANT 1 AG	2014	5	145	58.7	1.25	12.00	10.75
Show		251904	12 26 36 -63 05 57	ANT 1 AH	2013	3	167	47.3	1.25	13.00	11.75
Show		251904	12 26 36 -63 05 57	ANT 1 AI	2013	4	227	63.3	1.25	12.00	10.75
Show		251904	12 26 36 -63 05 57	ANT 7 AJ	2010	2	344	29.6	1.25	12.00	10.75
Show		251904	12 26 36 -63 05 57	ANT 7 AK	2010	2	218	125.2	1.25	13.00	11.75
Show		251903	12 26 36 -63 05 58	DUN 252 BC	2020	18	203	89.0	1.55	4.80	3.25
Show		251903	12 26 31 -63 07 20	TOK 7 CD	2000	2	53	2.4	5.40	10.50	5.10
Show		251903	12 26 31 -63 07 20	TOK 7 CE	1997	1	214	4.9	5.40	17.00	11.60
Show		251903	12 26 31 -63 07 20	TOK 7 CF	2015	2	114	7.4	5.40	15.97	10.57

11-fold system
11 estimated visually detectable stars in this system

Common name	Acrux		Constellation	Crux		SAO	251904		HIP	60718
Tycho2	8979-03464-1		HD	108248		HR	4730		GC	16952
CP	CP-62 2745		Bayer	Alpha 1 Crucis		Bayer name	Alp1 Cru		Flamsteed	256 Crucis
Flamsteed name	256 Cru		FK5	462		Distance	98.72		Distance ly	322.02
Bayer greek	α1 Cru

Meaning

a modern contraction of the Bayer designation, coined in the 19th century, but which entered into common use only by the mid-20th century