You're not logged.

Actions

Advanced Search
Go to Simbad
New report
New measure
Login

Computed Lists

Current system

Selections

Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

05407-0157 STF 774 AB (Alnitak)

05^h 40^m 45.52^s -01° 56' 33.3" P.A. 166.00 sep 2.4 mag 1.88,3.70 Sp +B0III dist. 225.73 pc (736.33 l.y.)

Coord 2000	05407-0157	Discov num	STF 774	Comp	AB	Coord arcsec 2000	05 40 45.52 -01 56 33.3
Date first	1822	Date last	2021	Obs	261
Pa first	152	Pa last	166.3	P.A. Now (θ)	166.3°
Sep first	2.3	Sep last	2.4	Sep. Now (ρ)	2.4"
Mag pri	1.88	Mag sec	3.70	delta mag (ΔM)	1.82	Spectral class	+B0III
Pri motion ra	+004	Sec motion ra	+004
Pri motion dec	+003	Sec motion dec	+003
Notes	N O (See Notes, Orbital solution)

This double is physical.

05407-0157 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		132444	05 40 46 -01 56 33	NOI 1 Aa,Ab	2021	25	244	0.0	2.00	4.20	2.20	Y
Show	Alnitak	132444	05 40 46 -01 56 33	STF 774 AB	2021	261	166	2.4	1.88	3.70	1.82	Y	<===
Show		132444	05 40 46 -01 56 33	STF 774 AC	2017	29	10	58.5	1.88	9.55	7.67
Show			05 40 46 -01 56 36	STF 774 BC	2002	3	8	59.8	3.70	9.55	5.85

Quadruple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Alnitak	Var name	NSV2553 Ori	Constellation	Orion	SAO	132444
HIP	26727	Tycho2	4771-01188-1	Gaia DR2	3216549528221605248	HD	37742
HR	1948	GC	7089	ADS	4263	BD	BD-02 1338
Bayer	Zeta Orionis	Bayer name	Zet Ori	Flamsteed	50 Orionis	Flamsteed name	50 Ori
Distance	225.73	Distance ly	736.33	Bayer greek	ζ Ori

Other names

ALNITAH

Meaning

belt

ORBITAL ELEMENTS

Period (P)	1508.6y	Periastron (T)	2070.6y	Semi-major axis (a)	2.728a
Eccentricity (e)	0.07	Inclination (i)	72°	Longitude of periastron (ω)	47.3°
Node (Ω)	155.5°	Notes	n	Reference	Hop1967
Equinox	1900	Last observation	1955	Grade	5	(1=Definitive, 9=Indet.)

label	theta	rho
2000	164.8	2.280
2001	164.9	2.275
2002	165.0	2.269
2003	165.1	2.264
2004	165.2	2.259
2005	165.3	2.253
2006	165.4	2.248
2007	165.5	2.242
2008	165.7	2.236
2009	165.8	2.231
2010	165.9	2.225
2011	166.0	2.219
2012	166.1	2.213
2013	166.2	2.208
2014	166.3	2.202
2015	166.4	2.196
2016	166.6	2.190
2017	166.7	2.184
2018	166.8	2.178
2019	166.9	2.172
2020	167.0	2.166
2021	167.1	2.160
2022	167.2	2.154
2023	167.4	2.147
2024	167.5	2.141
2025	167.6	2.135
2026	167.7	2.129
2027	167.8	2.122
2028	168.0	2.116
2029	168.1	2.110
2030	168.2	2.103

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS 05407-0157 STF 774 AB (Alnitak) : NOTES

discov_num	notes	refcode
STF 774	AB: zet Ori = 50 Ori = Alnitak. A premature orbit has been computed.
	Spectral types of AB: O9.5Ibe and B0III.
	Levato et al. (ApJS, 68, 319, 1988) and Fullerton (1990, PhD thesis,	Lev1988
	U. Toronto) report small RV variations (<35 km/sec), not confirmed.	Ful1990
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	Spectral type of Aa O9.5Ib, spectral type of Ab B0.5IV	Opl2023
	Both A and B components were observed and appeared to be single.	Msn1998a
	Classification of the B component is from Hoffleit & Warren (1991).	Hof1991
	AC: Star C (mag. about 9, 60") may be physical.
NOI 1	Aa,Ab: Combined spectroscopic/astrometric solution, using NPOI
	interferometric measures with radial velocities from disentangled
	spectra to determine first dynamical mass for an O-type supergiant.
	Mass of the O9.5Ib primary is 24.8 +/- 5.6 Msun, that of the B0/1
	secondary is 16.4 +/- 4.9 Msun.	NOI2011
	Aa,Ab: Hummel et al. (2013) calculated a combined interferometric/
	spectroscopic orbit of zet Ori. Derived masses are 14.0 +/- 2.2 and
	7.4 +/- 1.1 Msun; orbital parallax is 3.4 +/- 0.2 mas, but as this is
	based on rather low velocity amplitudes, the photometric distance
	(2.6 +0.4/-0.3 mas) is considered more robust. Based on photometric
	distance, spectral types for Aa, Ab, and B are O9.5Iab, B1IV, and
	B0III, respectively. Masses for Aa and Ab are 33 +/- 10 and 14 +/- 3
	Msun, considerably larger than the dynamical values.	Hmm2013
	Intensity Interferometer Limb-darkened diameter 0.48 +/- 0.04 mas.	HBr1974
	Uniform disk diameter 0.546 +/- 0.029 mas,
	Limb darkened diameter 0.485 +/- 0.019 mas,
	Radius is 21.5 +/- 5.4 \rsun.	CIA2018e
STF 774	AC: H 4 21.	MEv2010

REFERENCES

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
CIA2018e	not j	Gordon, K.D., Gies, D.R., Schaefer, G.H., Huber, D., Ireland, M. & Hillier, D.J.	2018ApJ...869...37G
CIA2018e		ApJ 869, 37, 2018
Ful1990	-	Fullerton, A.W.	.
Ful1990		PhD thesis, Univ. of Toronto, 1990
HBr1974	-	Hanbury Brown, R., Davis, J., & Allen, L.R.	1974MNRAS.167..121H
HBr1974		MNRAS 167, 121, 1974
Hmm2013	orb -	Hummel, C.A., Rivinius, Th., Nieva, M.-F., Stahl, O., van Belle, G., & Zavala, R.	2013A&A...554A..52H
Hmm2013		A&A 554, A52, 2013 (also NOI2013)
Hof1991	-	Hoffleit, D. & Jaschek, C.	1991bsc..book.....H
Hof1991		The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
Hop1967	orb -	Hopmann, J.	1967MiWie..13...49H
Hop1967		Mitt. Sternw. Wien 13, 49, 1967
Lev1988	-	Levato, H., Morrell, N., Garcia, B., & Malaroda, S.	1988ApJS...68..319L
Lev1988		ApJS 68, 319, 1988
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Msn1998a	Sc j	Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G.,	1998AJ....115..821M
Msn1998a		ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a		AJ 115, 821, 1998
NOI2011	Kn -	Rivinius, Th., Hummel, C.A., & Stahl, O.	.
NOI2011	+orb	Proc. IAU Symp 272, 2011
Opl2023	-	Oplistilova, A., Mayer, P., Harmanec, P. et al.	2023A&A...672A..31O
Opl2023		A&A 672, A31, 2023

DISCOVERER

idgroup	discov	author
1	STF	Struve, F.G.W.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
05407-0157	STF 774	AB	2008	241	166	2.4	1.88	3.70	O9.5Ibe	NOD	054045.52-015633.3
05407-0157	STF 774	AB	2009	246	168	2.5	1.88	3.70	O9.5Ibe	NOD	054045.52-015633.3
05407-0157	STF 774	AB	2010	250	165	2.5	1.88	3.70	O9.5Ibe	NOD	054045.52-015633.3
05407-0157	STF 774	AB	2011	251	165	2.5	1.88	3.70	O9.5Ibe	NOD	054045.52-015633.3
05407-0157	STF 774	AB	2013	256	167	2.4	1.88	3.70	O9.5Ibe	NOD	054045.52-015633.3
05407-0157	STF 774	AB	2017	259	166	2.4	1.88	3.70	O9.5Ibe	NO	054045.52-015633.3
05407-0157	STF 774	AB	2021	261	166	2.4	1.88	3.70	O9.2I+O9.	NO	054045.52-015633.3

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

WDS 05407-0157 STF 774 AB (Alnitak) : VISUAL OBSERVATIONS REPORTS

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	21/01/19	oldscope	mean difficulty	separated		do not miss it!	The seeing was 9/10 and that really helped. A surprisingly beautiful double star. Worth looking at on any good, steady night.

WDS 05407-0157 STF 774 AB (Alnitak) : MEASURES

No records found.

WDS 05407-0157 (Alnitak) : VIRTUAL EYEPIECE

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

WDS 05407-0157 (Alnitak) : ALADIN DSS IMAGE @ 05^h 40^m 45.52^s -01° 56' 33.3"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 05407-0157 STF 774 AB (Alnitak) : NEIGHBORHOODS

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show	Alnitak	05407-0157	NOI 1	Aa,Ab	244	0.0
Show	Alnitak	05407-0157	STF 774	AB	166	2.4
Show	Alnitak	05407-0157	STF 774	AC	10	58.5
Show		05407-0157	STF 774	BC	8	59.8	1
Show		05415-0158	CVS1914		263	5.5	12
Show		05416-0154	PAD 9	Aa,Ab	-1	0.8	13
Show		05416-0154	PAD 10	Ba,Bb	-1	0.3	13
Show		05416-0154	PAD 12	Ca,Cb	-1	0.2	14
Show		05416-0154	BCK 1	Ea,Eb	40	0.2	14
Show		05416-0154	PAD 13	Da,Db	-1	0.9	14
Show		05416-0153	PAD 11	AB	-1	2.0	14
Show		05416-0153	BCK 2	CD	25	1.9	14
Show		05416-0152	PAD 14		-1	0.4	14
Show		05416-0153	BCK 3	Ea,Eb	200	0.4	14
Show		05416-0153	PAD 15	Fa,Fb	-1	0.5	14
Show		05417-0153	BCK 4		320	0.6	14
Show		05417-0155	BCK 5	BC	315	0.4	15
Show		05417-0155	BCK 5	AB	225	2.2	15
Show		05417-0154	BCK 6	AB	30	1.9	15
Show		05417-0154	BCK 6	AC	85	2.0	15
Show		05417-0156	CHX 11	CD	112	4.1	15
Show		05417-0156	PAD 16	AB	-1	2.0	15
Show		05418-0154	BCK 7		320	1.0	16
Show		05418-0156	MGM2926		252	0.6	16
Show		05418-0155	ALV 3		284	4.7	16
Show		05419-0201	CVS 185		190	2.4	18
Show		05396-0145	CVS 172		332	6.9	21
Show		05419-0143	CVS 186	AB	81	4.2	22
Show		05419-0143	CVS 186	AC	212	19.7	22
Show		05414-0217	MGM2849		346	1.2	23
Show		05395-0143	CVS1880	AB	259	6.9	23
Show		05395-0143	CVS1880	AC	108	7.0	23
Show		05405-0134	BAL 310		65	5.2	24
Show		05416-0216	MGM2848		180	0.3	24
Show		05417-0216	MGM2851		255	2.3	25
Show		05416-0217	MGM2846		253	2.4	25
Show		05391-0155	CVS 167		182	5.2	26
Show		05403-0131	RST4786		101	0.6	27
Show		05390-0151	CVS1851	AB	95	5.2	27
Show		05390-0151	CVS1851	AC	349	7.3	27
Show		05390-0151	CVS1851	AD	26	14.7	27
Show		05390-0149	CVS1854		349	18.1	27
Show		05399-0225	SKF2363		4	2.1	31
Show		05391-0136	CVS1856		168	19.6	33
Show		05386-0151	CVS1838	AB	50	2.2	33
Show		05386-0151	CVS1838	AC	4	16.4	33
Show		05398-0226	CAB 33		220	2.7	34
Show		05390-0216	CAB 40		56	2.7	34
Show		05385-0200	CVS1829	AB	159	0.7	34
Show		05385-0200	CVS1829	AC	270	5.0	34
Show		05430-0200	UC 1352		23	7.8	34

WDS 05407-0157 : COMPONENTS

	A	Ab	B
Ab	pa=244.4° sep=0.04"
B	pa=161.9° sep=2.42"	pa=161.0° sep=2.41"
C	pa=10.4° sep=58.46"	pa=10.4° sep=58.48"	pa=9.3° sep=60.60"

05407-0157 A

Common name	Alnitak	Meaning	belt	Other names	ALNITAH	Coord arcsec 2000	054045.52-015633.3
Mag	1.88	PmRA	4.00	PmDE	3.0	SAO	132444
HIP	26727	Tycho2	4771-01188-1	HD	37742	HR	1948
GC	7089	BD	BD-02 1338	Bayer	Zeta Orionis	Bayer name	Zet Ori
Flamsteed	50 Orionis	Flamsteed name	50 Ori

SAO

SAO	132444	DelFlag		RA1950		PmRA1950	-0.0001
DE1950		PmDE1950	-0.002	Vmag	2	SpType	B0
Double code		Source	71	CatNum	1631	DM	BD-02 1338
DMcomp		BDsup		HD	37742	M HD	9
GC	7089	RA1950rad	1.47582449	DE1950rad	-0.03433925	PmRA2000	0.0002
PmDE2000	-0.002

Hipparcos

Catalog	H	HIP	26727	Proxy	H	RAhms	05 40 45.52
DEdms	-01 56 33.3	Vmag	1.74	VarFlag		R Vmag	H
RAdeg	85.1897	DEdeg	-1.94258	AstroRef	A	Plx	3.99
CCDM	05408-0156	N CCDM	I	Nsys	1	Ncomp	2
MultFlag	C	Source		Qual	A	M HIP	AB
Theta	164	Rho	2.419	HD	37742	BD	BD-02 1338
CD		CP		Dm number	-02 1338	VIred	-0.18
SpType	O9.5Ib SB	R SpType		Coord arcsec 2000	054045.52-015633.3

Hipparcos 2

HIP	26727	Sn	15	So	3	Nc	2
RArad	1.4868405212	DErad	-0.0339043911	Plx	4.43	PmRA	3.19
PmDE	2.03	E RArad	0.52	E DErad	0.25	E Plx	0.64
E pmRA	0.59	E pmDE	0.26	Hpmag	1.6812	E Hpmag	0.0011
SHp	0.009	VA	0	BV	-0.199	E BV	0.022
VI	-0.18

05407-0157 Ab

Coord arcsec 2000

054045.52-015633.3

Mag

4.2

Calc delta mag

2.2

Calc coord

yes

05407-0157 B

Coord arcsec 2000	054045.57-015635.6		Coord calc	054045.57-015635.6		Mag	3.7		Spectral class	B3V (blue-white)
PmRA	4.00		PmDE	3.0		Calc delta mag	1.7

05407-0157 C

Coord arcsec 2000	054046.22-015535.8		Mag	9.55		Spectral class	A? (white)		PmRA	3.00
PmDE	-3.0		Tycho2	4771-01207-1		Calc delta mag	7.55		Calc coord	yes

Tycho2

Tycho2	4771-01207-1	Pflag		RAmdeg	85.19236431	DEmdeg	-1.92677841
PmRA	2.2	PmDE	-4.7	E RAmdeg	12	E DEmdeg	21
E pmRA	0.9	E pmDE	1.0	EpRAm	1989.78	EpDEm	1985.59
Num	7	Q RAmdeg	2.2	Q DEmdeg	2.9	Q pmRA	2.2
Q pmDE	2.7	BTmag	9.675	E BTmag	0.027	VTmag	9.553
E VTmag	0.028	Prox	577	TYC	T	HIP
CCDM		RAdeg	85.19236028	DEdeg	-1.92676417	EpRA 1990	1.81
EpDE 1990	1.21	E RAdeg	11.8	E DEdeg	21.5	Posflg
Corr	0.3