17299-4214 B 1860 (Del Ara)

Coord 2000	17299-4214		Discov num	B  1860		Comp			Coord arcsec 2000	17 29 56.56 -42 14 24.6
Date first	1930		Date last	1991		Obs	4
Pa first	191		Pa last	196.9		P.A. Now (θ)	196.9°
Sep first	0.8		Sep last	0.832		Sep. Now (ρ)	0.832"
Mag pri	10.23		Mag sec	10.75		delta mag (ΔM)	0.52		Spectral class	B8 (blue-white)
Pri motion ra	-005		Sec motion ra	-005
Pri motion dec	-005		Sec motion dec	-005
Notes

Nature of this double is uncertain.

Name	Del Ara		Constellation	Scorpius		SAO	253945		HIP	85727
Tycho2	7891-02202-1		Gaia DR2	5959127008553189376		HD	158094		HR	6500
GC	23681		CP	CP-60 6842		Bayer	Delta Arae		Bayer name	Del Ara
FK5	648		Distance	60.68		Distance ly	197.94		Bayer greek	δ Ara

Bayer or Flamsteed indentifiers not always match the correct constellation because of procession and proper motion of the star. (Ara vs Sco)

Period (P)	1043.2954d (2.86y)	± 244.0574	Periastron (T)	47854.3281d (1989.897y)	± 126.1882	Semi-major axis (a)	6.72m	± 1.62
Eccentricity (e)	0		Inclination (i)	90.92°	± 6	Longitude of periastron (ω)	0°
Node (Ω)	130.27°	± 5.59	Notes	n		Reference	HIP1997d
Equinox			Last observation	1991		Grade	9	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 310.1 0.007 2001-01-01 131.1 0.005 2002-01-01 119.1 0.001 2003-01-01 309.7 0.006 2004-01-01 130.7 0.006 2005-01-01 314.1 0.002 2006-01-01 309.2 0.004 2007-01-01 130.3 0.007 2008-01-01 311.8 0.004 2009-01-01 308.0 0.003 2010-01-01 130.0 0.007 2011-01-01 311.1 0.005 2012-01-01 298.3 0.001 2013-01-01 129.7 0.006 2014-01-01 310.6 0.006 2015-01-01 134.0 0.002 2016-01-01 129.2 0.004 2017-01-01 310.3 0.007 2018-01-01 131.8 0.004 2019-01-01 128.0 0.003 2020-01-01 310.0 0.007 2021-01-01 131.0 0.005 2022-01-01 117.5 2023-01-01 309.7 0.006 2024-01-01 130.6 0.006 2025-01-01 313.9 0.002 2026-01-01 309.2 0.004 2027-01-01 130.3 0.007 2028-01-01 311.7 0.004 2029-01-01 308.0 0.003 2030-01-01 130.0 0.007		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Period (P)	225d	± 262	Periastron (T)	48493d (1991.645y)	± 224	Semi-major axis (a)	14.5m	± 9.6
Eccentricity (e)	0.42	± 0.36	Inclination (i)	65°	± 26	Longitude of periastron (ω)	92°	± 54
Node (Ω)	152°	± 92	Notes			Reference	Gln2007
Equinox			Last observation	1991		Grade	9	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 89.2 0.009 2001-01-01 344.5 0.013 2002-01-01 140.7 0.014 2003-01-01 41.4 0.009 2004-01-01 313.8 0.008 2005-01-01 118.9 0.012 2006-01-01 5.3 0.012 2007-01-01 164.9 0.009 2008-01-01 84.6 0.009 2009-01-01 342.3 0.013 2010-01-01 138.6 0.014 2011-01-01 36.7 0.009 2012-01-01 306.2 0.007 2013-01-01 116.2 0.012 2014-01-01 2.6 0.012 2015-01-01 160.6 0.010 2016-01-01 79.9 0.009 2017-01-01 340.0 0.013 2018-01-01 136.5 0.014 2019-01-01 32.2 0.009 2020-01-01 294.9 0.005 2021-01-01 113.3 0.011 2022-01-01 359.9 0.012 2023-01-01 157.0 0.011 2024-01-01 74.9 0.009 2025-01-01 337.6 0.013 2026-01-01 134.4 0.014 2027-01-01 27.9 0.010 2028-01-01 277.0 0.004 2029-01-01 110.2 0.011 2030-01-01 357.4 0.013		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic