08447-5443 I 10 AB (Alsephina)

Coord 2000	08447-5443		Discov num	I    10		Comp	AB		Coord arcsec 2000	08 44 42.23 -54 42 31.8
Date first	1894		Date last	2021		Obs	75
Pa first	177		Pa last	188.5		P.A. Now (θ)	189.8°
Sep first	2.2		Sep last	0.939		Sep. Now (ρ)	1.024"
Mag pri	1.99		Mag sec	5.57		delta mag (ΔM)	3.58		Spectral class	A1Va+F8V (white/yellow-white)
Pri motion ra	+029		Sec motion ra	-002
Pri motion dec	-104		Sec motion dec	-056
Notes	N O (See Notes, Orbital solution)

rPM=0.529 This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		236232	08 44 42 -54 42 32	KEL 1 Aa,Ab	2018	6	324	0.0	1.99			Y
Show	Alsephina	236232	08 44 42 -54 42 32	I 10 AB	2021	75	189	0.9	1.99	5.57	3.58	Y	<===
Show		236232	08 44 42 -54 42 32	HJ 4136 AC	1998	9	56	72.0	1.99	14.90	12.91
Show		236232	08 44 42 -54 42 32	I 10 AE	1998	3	251	76.8	1.99	14.70	12.71
Show		236232	08 44 42 -54 42 32	SHY 49 AF	2016	4	100	999.9	1.99	5.75	3.76
Show			08 44 49 -54 41 50	HJ 4136 CD	2015	5	86	5.6	11.00	13.50	2.50

Septuple system
6 estimated visually detectable stars in this system

Common name	Alsephina		Constellation	Vela		SAO	236232		HIP	42913
Tycho2	8573-03571-1		Gaia DR2	5317047711486539392		HD	74956		HR	3485
GC	12069		GL	Gl 321.3A		CP	CP-54 1788		Bayer	Delta Velorum
Bayer name	Del Vel		Distance	24.7		Distance ly	80.57		Bayer greek	δ Vel

Period (P)	146.97y		Periastron (T)	2000.78y		Semi-major axis (a)	2.002a
Eccentricity (e)	0.482		Inclination (i)	105.6°		Longitude of periastron (ω)	8.5°
Node (Ω)	344.7°		Notes	n		Reference	Msn2011b
Equinox	2000		Last observation	2010		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 344.1 1.038 2001 341.9 1.022 2002 339.6 0.994 2003 337.2 0.954 2004 334.5 0.904 2005 331.5 0.846 2006 328.0 0.781 2007 323.9 0.712 2008 318.8 0.640 2009 312.4 0.569 2010 304.3 0.502 2011 293.9 0.444 2012 280.9 0.403 2013 265.7 0.384 2014 250.1 0.391 2015 236.0 0.423 2016 224.4 0.475 2017 215.3 0.540 2018 208.3 0.614 2019 202.9 0.693 2020 198.6 0.774 2021 195.1 0.857 2022 192.2 0.941 2023 189.8 1.024 2024 187.8 1.106 2025 186.0 1.188 2026 184.5 1.267 2027 183.1 1.346 2028 181.9 1.422 2029 180.8 1.497 2030 179.9 1.570		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
I 10	AB: del Vel = Alsephina.
	The close pair of Tango et al. (1979), originally thought to be a new	Tng1979
	close pair (and called TNG 1), was determined to be the Innes pair
	with a reflection around the E/W axis. This problem was first noticed
	by Mike Kerr in a private communication to B. Mason.
	Quoted errors in P and a are +14/-11y, +0".03/-0".01.	Ary2002b
	AB: Kervella et al. (2013) measured separations between the A and B
	components, then based on their orbit of AB derived apparent
	displacements of the center of light of the eclipsing Aa,Ab pair.	Krv2013
KEL 1	Aa,Ab: Eclipsing binary. Interferometric solution by Kellerer et al.	Kel2007
	(2007), using data from the VLTI/VINCI (K-band, 155m baseline) taken
	in April/May 2003. Semimajor axis given as (5.4 +/- 0.5) x 10^10 m,
	converted to mas using parallax of 40.90 mas. Aa and Ab are thought to
	be of spectral types A0V and A1V, but model fit yields stellar
	diameters of 6.0 +/- 0.5 and 3.3 +/- 0.6 Dsun, larger than would be
	expected for main-sequence stars. Authors also conclude that C and D
	components of the system are much further away than Aa+Ab+B, so are
	not physically associated with the close triple.
	Aa,Ab: Properties of components Aa, Ab, and B are as follows:
	Spectral types: A2IV A4V F8V
	M/Msun: 2.5 +/- 0.1 2.0 +/- 0.1 1.3 +/- 0.1
	L/Lsun: 59.2 +/- 2.0 20.0 +/- 0.7 3.1 +/- 0.2
	R/Rsun: 3.17 +/- 0.08 2.02 +/- 0.05 1.39 +/- 0.06
	Teff (K): 9000 +/- 400 8600 +/- 350 6350 +/- 350	Krv2009
	Aa,Ab: Masses 2.43 +/- 0.02 and 2.27 +/- 0.03 Msun, luminosities
	67. +/- 1. and 51. +/- 1. Lsun, parallax 39.8 +/- 0.4 mas
	Mass sum (Aa+Ab+B) = 6.15 +/- 0.23 Msun, assuming derived parallax.	Mrd2011
SHY 49	AF: HIP 42913 + HIP 43797.

refcode	metd	author	reference
Ary2002b	orb -	Argyle, R.W., Alzner, A. & Horch, E.	2002A&A...384..171A
Ary2002b		A&A 384, 171, 2002
Kel2007	orb -	Kellerer, A., Petr-Gotzens, M.G., Kervella, P., & Coude du Foresto, V.	2007A&A...469..633K
Kel2007		A&A 469, 633, 2007
Krv2009	A -	Kervella, P., Thevenin, F., & Petr-Gotzens, M.G.	2009A&A...493..107K
Krv2009	+Pa	A&A 493, 107, 2009
Krv2013	A j	Kervella, P., Merand, A., Petr-Gotzens, M.G., & Thevenin, F.	2013A&A...552A..18K
Krv2013		A&A 552, A18, 2013
Mrd2011	A j	Merand, A., Kervella, P., Pribulla, T., Petr-Gotzens, M.G., Benisty, M.,	2011A&A...532A..50M
Mrd2011	+Kv	Natta, A., Duvert, G., Schertl, D., & Vaiiner, M.
Mrd2011	+Ci	A&A 532, A50, 2100
Mrd2011	+orb	(updated elements for KEL 1 Aa,Ab orbit from Pribulla, private communication)
Msn2011b	orb -	Mason, B.D.	2011IAUDS.173....1M
Msn2011b		Inf. Circ. 173, 1, 2011
Tng1979	S j	Tango, W.J., Davis, J., Thompson, R., & Hanbury Brown, R.	.
Tng1979		Proc. Astron. Soc. Australia 3, 323, 1979

idgroup	discov	author
1	HJ	Herschel, J.F.W.
50	I	Innes, R.T.A.
54	I	MNRAS 57, 533, 1897 (data also in I__1897b,
54	I	I__1897c)
140	SHY	Shaya, E.J. & Olling, R.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
08447-5443	I 10	AB	2001	38	338	1.0	1.99	5.57	A1V	NOD	084442.20-544230.8
08447-5443	I 10	AB	2010	39	304	0.5	1.99	5.57	A1V	NOD	084442.20-544230.8
08447-5443	I 10	AB	2011	52	294	0.4	1.99	5.57	A1V F8V	NOD	084442.22-544231.7
08447-5443	I 10	AB	2012	53	280	0.4	1.99	5.57	A1V F8V	NOD	084442.22-544231.7
08447-5443	I 10	AB	2013	54	263	0.4	1.99	5.57	A1V F8V	NOD	084442.22-544231.7
08447-5443	I 10	AB	2017	70	209	0.5	1.99	5.57	A1Va+F8V	NO	084442.23-544231.8
08447-5443	I 10	AB	2018	72	199	0.7	1.99	5.57	A1Va+F8V	NO	084442.23-544231.8
08447-5443	I 10	AB	2019	74	195	0.8	1.99	5.57	A1Va+F8V	NO	084442.23-544231.8
08447-5443	I 10	AB	2021	75	189	0.9	1.99	5.57	A1Va+F8V	NO	084442.23-544231.8

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

FoV: 30" 1' 5' 15' 30' 1° 2° 4° 5° 8° Limit: 2 3 4 5 10 15 20 25 30 50 100 Primaries only
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Show name coord_2000 discov# comp pa sep dist(') Show Alsephina 08447-5443 I 10 AB 189 0.9 Show Alsephina 08447-5443 HJ 4136 AC 56 72.0 Show Alsephina 08447-5443 I 10 AE 251 76.8 Show Alsephina 08447-5443 SHY 49 AF 100 999.9 Show Alsephina 08447-5443 KEL 1 Aa,Ab 324 0.0 Show 08447-5443 HJ 4136 CD 86 5.6 2 Show 08454-5440 I 356 297 2.6 6 Show 08472-5448 RST2582 26 0.5 22 Show 08474-5500 BRT2542 357 3.7 29 Show 08467-5506 BRT2541 115 6.4 30 Show 08427-5514 RST3606 12 0.5 36 Show 08465-5406 TDS6089 317 0.7 40 Show 08505-5436 FIN 36 83 2.6 51 Show 08423-5354 RSS 171 125 20.5 53 Show 08400-5408 RST2577 62 0.7 54 Show 08383-5445 KPP3755 69 19.3 56 Show 08512-5432 DAM1493 248 4.7 58 Show 08498-5401 HJ 4145 256 5.4 61 Show 08519-5457 LDS 238 358 36.2 64 Show 08508-5407 HJ 4148 111 5.6 64 Show 08401-5351 FIN 394 229 7.6 66 Show 08412-5542 RST 342 223 0.3 67 Show 08373-5507 KPP1485 117 11.2 69 Show 08436-5331 HDS1255 79 0.4 72 Show 08506-5350 BRT2030 333 3.7 74 Show 08372-5518 ELP 21 AB 341 1.6 74 Show 08372-5518 ELP 21 AC 84 5.1 74 Show 08372-5518 ELP 21 AD 24 5.7 74 Show 08459-5327 ELP 22 283 0.2 76 Show 08524-5521 FIN 37 50 0.9 77 Show 08536-5445 TDS6166 126 0.7 78 Show 08447-5606 RST5567 219 6.7 84 Show 08533-5522 FIN 38 31 2.2 84 Show 08391-5557 TOK 356 BC 46 0.1 89 Show 08391-5557 HU 1443 AB 16 0.9 89 Show 08352-5412 DCH 124 Aa,Ab 158 0.2 89 Show 08387-5558 TDS6003 206 1.3 91 Show 08375-5336 HJ 4123 110 41.2 93 Show 08346-5415 FIN 118 71 3.2 93 Show 08554-5452 RST2594 177 1.3 94 Show 08551-5509 RST2592 300 1.5 94 Show 08458-5309 DAM1480 157 1.9 95 Show 08463-5308 HU 1589 90 3.4 96 Show 08495-5610 HU 1448 327 2.2 97 Show 08336-5458 RST3597 4 1.5 97 Show 08424-5307 BSO 18 A,BC 311 76.3 98 Show 08424-5307 B 1625 BC 168 0.6 99 Show 08424-5307 BSO 18 BC,D 267 60.4 99 Show 08562-5452 LDS 242 313 5.1 100 Show 08427-5621 RST 345 54 6.8 100 Show 08432-5622 HU 1444 35 4.3 100

	A	Ab	B	C	D	E
Ab	pa=337.5° sep=0.02"
B	pa=184.9° sep=0.93"	pa=184.3° sep=0.95"
C	pa=54.6° sep=71.91"	pa=54.6° sep=71.91"	pa=54.0° sep=72.52"
D	pa=55.7° sep=74.78"	pa=55.7° sep=74.78"	pa=55.2° sep=75.38"	pa=82.4° sep=3.23"
E	pa=239.2° sep=48.80"	pa=239.2° sep=48.81"	pa=240.1° sep=48.27"	pa=236.4° sep=120.62"	pa=237.1° sep=123.53"
F	pa=107.0° sep=3281.86"	pa=107.0° sep=3281.88"	pa=107.0° sep=3281.66"	pa=108.0° sep=3239.17"	pa=108.0° sep=3236.27"	pa=106.4° sep=3314.44"

Common name	Alsephina		Coord arcsec 2000	084442.23-544231.8		Mag	1.99		Spectral class	A1Va (white)
PmRA	29.00		PmDE	-104.0		SAO	236232		HIP	42913
Tycho2	8573-03571-1		HD	74956		HR	3485		GC	12069
CP	CP-54 1788		Bayer	Delta Velorum		Bayer name	Del Vel

SAO	236232		DelFlag			RA1950			PmRA1950	0.0025
DE1950			PmDE1950	-0.079		Vmag	2		SpType	A0
Double code			Source	71		CatNum	330		DM	CP-54 1788
DMcomp			BDsup			HD	74956		M HD	0
GC	12069		RA1950rad	2.28342752		DE1950rad	-0.95163234		PmRA2000	0.0027
PmDE2000	-0.078

Catalog	H		HIP	42913		Proxy	H		RAhms	08 44 42.20
DEdms	-54 42 30.8		Vmag	1.93		VarFlag			R Vmag	H
RAdeg	131.176		DEdeg	-54.7086		AstroRef	A		Plx	40.9
CCDM	08448-5442		N CCDM	I		Nsys	1		Ncomp	2
MultFlag	C		Source			Qual	A		M HIP	AB
Theta	5		Rho	0.736		HD	74956		BD
CD			CP	CP-54 1788		Dm number	-54 1788		VIred	0.05
SpType	A1V		R SpType			Coord arcsec 2000	084442.20-544230.8

HIP	42913		Sn	15		So	3		Nc	2
RArad	2.2894499954		DErad	-0.9548446415		Plx	40.49		PmRA	28.99
PmDE	-103.35		E RArad	0.39		E DErad	0.47		E Plx	0.39
E pmRA	0.5		E pmDE	0.54		Hpmag	1.9511		E Hpmag	0.0003
SHp	0.003		VA	0		BV	0.043		E BV	0.006
VI	0.05

Coord arcsec 2000

084442.23-544231.8

Spectral class

A4V (white)

Calc delta mag

1.99

Calc coord

yes

Coord arcsec 2000	084442.22-544232.7		Mag	5.57		Spectral class	F8V (yellow-white)		PmRA	-2.00
PmDE	-56.0		Calc delta mag	3.58		Calc coord	yes

Coord arcsec 2000	084448.99-544150.1		Coord calc	084448.99-544150.1		Mag	11		PmRA	-6.00
PmDE	2.0		Calc delta mag	9.01

Coord arcsec 2000

084449.36-544149.7

Mag

13.5

Calc delta mag

11.51

Calc coord

yes

Coord arcsec 2000	084437.39-544256.8		Mag	14.7		PmRA	-9.00		PmDE	0.0
Calc delta mag	12.71		Calc coord	yes

Coord arcsec 2000	085045.55-545832.7		Mag	5.75		Spectral class	F6V (yellow-white)		PmRA	25.00
PmDE	-92.0		Calc delta mag	3.76		Calc coord	yes