Coord 2000 | 05407-0157 | Discov num | STF 774 | Comp | BC | Coord arcsec 2000 | 05 40 45.57 -01 56 35.6 | ||||
Date first | 1909 | Date last | 2002 | Obs | 3 | ||||||
Pa first | 8 | Pa last | 8.3 | P.A. Now (θ) | 8.3° | ||||||
Sep first | 59.8 | Sep last | 59.77 | Sep. Now (ρ) | 59.77" | ||||||
Mag pri | 3.70 | Mag sec | 9.55 | delta mag (ΔM) | 5.85 | Spectral class | B3V+A? (blue-white/white) | ||||
Pri motion ra | +004 | Sec motion ra | +003 | ||||||||
Pri motion dec | +003 | Sec motion dec | -003 | ||||||||
Notes | N (See Notes) |
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 | <=== |
Constellation | Orion | Tycho2 | 4771-01207-1 | Gaia DR2 | 3216549528221605248 |
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 |
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 | ||
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 |
idgroup | discov | author |
1 | STF | Struve, F.G.W. |
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
05407-0157 | STF 774 | BC | 2002 | 3 | 8 | 59.8 | 3.70 | 9.55 | B0 | N | 054045.50-015635.0 |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
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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" |
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 | 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 |
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 |
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 |
Coord arcsec 2000 | 054045.52-015633.3 | Mag | 4.2 | Calc delta mag | 2.2 | Calc coord | yes |
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 |
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 | 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 |