06377+1624 OCC 9011 Aa,Ab (Alhena)

06^h 37^m 42.71^s +16° 23' 57.4" P.A. 260.00 sep 0.4 mag 1.90,7.50 Sp A0IV dist. 33.51 pc (109.31 l.y.)

Coord 2000	06377+1624	Discov num	OCC9011	Comp	Aa,Ab	Coord arcsec 2000	06 37 42.71 +16 23 57.4
Date first	1991	Date last	2012	Obs	2
Pa first	126	Pa last	259.5	P.A. Now (θ)	259.5°
Sep first	0.1	Sep last	0.378	Sep. Now (ρ)	0.378"
Mag pri	1.90	Mag sec	7.50	delta mag (ΔM)	5.6	Spectral class	A0IV (white)
Pri motion ra	+014	Sec motion ra
Pri motion dec	-055	Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

06377+1624 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Alhena	95912	06 37 43 +16 23 57	OCC 9011 Aa,Ab	2012	2	260	0.4	1.90	7.50	5.60	Y	<===
Show		95912	06 37 43 +16 23 57	BUP 90 AB	2009	5	296	140.5	1.90	13.00	11.10
Show		95912	06 37 43 +16 23 57	BUP 90 AC	2009	5	335	148.1	1.90	12.30	10.40

Quadruple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Alhena	Constellation	Gemini	SAO	95912	HIP	31681
Tycho2	1329-01746-1	HD	47105	HR	2421	GC	8633
BD	BD+16 1223	Bayer	Gamma Geminorum	Bayer name	Gam Gem	Flamsteed	24 Geminorum
Flamsteed name	24 Gem	FK5	251	Distance	33.51	Distance ly	109.31
Bayer greek	γ Gem

Other names

ALMEISAN

Meaning

one who shines / forward

ORBITAL ELEMENTS

Period (P)	12.634y	Periastron (T)	1979.34y	Semi-major axis (a)	0.2732a
Eccentricity (e)	0.89	Inclination (i)	106.7°	Longitude of periastron (ω)	132.6°
Node (Ω)	243.6°	Notes	n	Reference	Dru2014
Equinox		Last observation	2012	Grade	5	(1=Definitive, 9=Indet.)

label	theta	rho
2000	257.6	0.382
2001	255.7	0.371
2002	253.5	0.339
2003	250.6	0.279
2004	244.8	0.161
2005	9.0	0.041
2006	289.1	0.107
2007	275.3	0.186
2008	269.3	0.251
2009	265.7	0.302
2010	263.0	0.341
2011	260.8	0.368
2012	258.8	0.381
2013	256.9	0.380
2014	254.9	0.362
2015	252.5	0.321
2016	249.1	0.245
2017	237.2	0.079
2018	319.5	0.055
2019	282.2	0.137
2020	272.7	0.211
2021	267.8	0.271
2022	264.6	0.318
2023	262.2	0.352
2024	260.1	0.374
2025	258.1	0.383
2026	256.2	0.376
2027	254.1	0.350
2028	251.5	0.299
2029	247.1	0.202
2030	50.6	0.043

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

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

WDS 06377+1624 OCC 9011 Aa,Ab (Alhena) : NOTES

discov_num	notes	refcode
BUP 90	gam Gem = 24 Cen = Alhena. H V 71. Elements P, T, e, and the longitude	Bey1967
	of periastron are from a spectroscopic orbit. Beardsley's data are
	inconsistent; the values of a, i, and the node given here approximate
	his ABFG most closely.
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
gam Gem	Aa,Ab: Combined astrometric/spectroscopic solution. Fekel & Tomkin	Kpr1987b
	(1993) derive a spectroscopic period of 4614.0 +/- 0.7 days, as well	Fek1993
	as an approximate magnitude difference of 6.0 +/- 0.5 mag in V.
	An additional spectroscopic solution by Scholz et al. (1997) yielded a	Slz1997
	period of 4614.51 +/- 0.47; Lehmann et al. (2002) found a similar	Leh2002
	period and also looked for short-period variations.
OCC 9011	Aa,Ab: Drummond (2014) resolves the Aa,Ab pair, previously detected
	only by occultation. Setting scale of the astrometric/spectroscopic
	orbit, and combining with the van Leeuwen (2007) Hipparcos parallax,
	he derives component masses 3.4 +/- 0.8 and 1.4 +/- 0.3 Msun.	Dru2014
	Intensity Interferometer Limb-darkened diameter 1.39 +/- 0.09 mas.	HBr1974

REFERENCES

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Bey1967	orb -	Beardsley, W.R.	1967IAUS...30..189B
Bey1967		IAU Symp. 30, 189, 1967
Dru2014	A j	Drummond, J.D.	2014AJ....147...65D
Dru2014	+orb	AJ 147, 65, 2014
Dru2014		(Note: slight modifications to published measures, as well as additional measures,
Dru2014		provided by Drummond, private comm.)
Fek1993	-	Fekel, F.C. & Tomkin, J.	1993AJ....106.1156F
Fek1993		AJ 106, 1156, 1993
HBr1974	-	Hanbury Brown, R., Davis, J., & Allen, L.R.	1974MNRAS.167..121H
HBr1974		MNRAS 167, 121, 1974
Kpr1987b	orb -	Kamper, K.W. & Beardsley, W.R.	1987AJ.....94.1302K
Kpr1987b		AJ 94, 1302, 1987
Leh2002	orb -	Lehmann, H., Andrievsky, S.M., Egorova, I. Hildebrandt, G., Korotin, S.A.,	2002A&A...383..558L
Leh2002		Panov, K.P., Scholz, G., & Schoenberner, D.
Leh2002		A&A 383, 558, 2002
Slz1997	-	Scholz, G., Lehmann, H., Harmanec, P., Gerth, E., & Hildebrandt, G.	1997A&A...320..791S
Slz1997		A&A 320, 791, 1997

DISCOVERER

idgroup	discov	author
1	BUP	Burnham proper motion stars (see Burnham, Carnegie Inst. Wash. #168, 1913)
1	OCC	Taylor, G.E., O'Leary, B., van Fladern, T.C. Bartholdi, P., Owen, F.,
1	OCC	Hubbard, W.B., Smith, B.A., Smith, S.A., Fallon, F.W. Devinney, E.J. & Oliver, J.
6	OCC	Dunham, D.W., Dunham, J.B., Binzel, R.P., Evans, D.S., Freuh, M., Henry, G.W.,
6	OCC	A'Hearn, M.A., Schnurr, R., Betts, R., Haynes, H., Orcutt, R., Bowell, E., et al.
9	OCC	Vasundhara, R., Jayakumar, K., Velu, C., Appakutty, M., Paranjpye, A.,
9	OCC	Kulkarni, H., Nitsure, P., Prabhunne, M. & Shah, K.
16	OCC	Lin, C.-L., Zhang, Z.-W., Chen, W.P., King, S.-K., Lin, H.-C., Bianco, F.B.,
16	OCC	Lehner, M.J., Coehlo, N., Wang, J.-H., Mondal, S., Alcock, C., Axelrod, T., et al.
17	OCC	Herald, D., Boyle, R., Dunham, D., Hirose, T., Maley, P., Timerson, B., Farris,
17	OCC	T., Frappa, E., Lecacheux, J., Hayamizu, T., Kozubal, M., Nolthenius, R., et al.
22	OCC	Loader, B., Asada, Y., Breit, D., Bradshaw, J., Gault, D., Herald, D., Iverson,
22	OCC	E., Ishida, M., Karasaki, H., Kashiwagura, M., Miyashita, K., Messner, S., et al.
25	OCC	Loader, B. Bradshaw, J., Breit, D., Gault, D., George, T., Herald, D., Iverson,
25	OCC	E., Ishida, M., Karasaki, H., Kashiwagura, M., Kenmotsu, K., Lowe, D., et al.
26	OCC	George, T., Timerson, B., Cooke, B., Degenhardt, S., Dunham, D.W., Messner, S.,
26	OCC	Suggs, R., Venable, R. & Warren, W.H.
27	OCC	George, T., Timerson, B., Beard, T., Blank, T., Dantowitz, R., Davis, J.,
27	OCC	di Cicco, D., Dunham, D.W., Hill, M., Sliski, A. & Sumner, R.
28	OCC	Bulder, H., Loader, B., Herald, D., Messner, S., Ling, A., Raab, H.,
28	OCC	Culbertson, B., Black, S., Ishida, M., Ohno, T., & Miyashita, K.
29	OCC	George, T., Timerson, B., Degenhardt, S., Bracken, C., Cadmus, R., Carcich, A.,
29	OCC	Centala, J., Modic, R., & Slauson, D.
30	OCC	Loader, B., Asada, Y., Bradshaw, J., Breit, D., Fuertes, J., Gault, D., George,T.,
30	OCC	Graham, P., Herald, D., Holenstein, B., Iverson, E., Ishida, M., et al.
31	OCC	George, T., Timerson, B., Brooks, J., Conrad, S., Dunham, J.B., Dunham, D.W.,
31	OCC	Jones,R., Lipka, T.R., Thomas, W., Warren, W.J., Jr., Wasson, R. & Wisniewski, J.
48	OCC	Loader, B., Bradshaw, J., Breit, D., Edens, E., Forbes, M., Gault, D., George, T.,
48	OCC	Haymes, T., Herald, D., Holenstein, B., Ito, T., Iverson, E., et al.
49	OCC	Soma, M., Hayamizu, T., Ishida, M., Owada, M., Ida, M., Aikawa, R., Hashimoto, A.,
49	OCC	Horaguchi, T., Kitazaki, K., Uchiyama, S., Uehara, S., Yaeza, A., et al.
50	OCC	Loader, B., Asai, A., Bardecker, J., Bradshaw, J., Breit, D., Buettner, D.,
50	OCC	Chad, C., Denyer, P., Edens, E., Forbes, M., Gault, D., George, T., et al.
53	OCC	Loader, B., Anderson, P., Asai, A., Bradshaw, J., Breit, D., Forbes, M.,
53	OCC	Gault, D., George, T., Haymes, T., Herald, D., Ishida, M., Kerr, S., et al.
56	OCC	Timerson, B., George, T., Bean, J., Blank, T., Bardecker, J., Dunham, D., Dunham,
56	OCC	J., Gimple, B., Maley, P., Anthony, S., Wiesenborn, C., Hunt, T., Sumner, R. &
56	OCC	Thomas, W.
57	OCC	Hirose, T., Ida, M., Yamamura, H., Uchiyama, S., Hashimoto, A., Aikawa, R.,
57	OCC	Terakubo, K., Sato, M. & Shima, K.
58	OCC	Loader, B., Asada, Y., Asai, A., Bardecker, J., Bourgeois, J., Bradshaw, J., Chad,
58	OCC	C., Ellington, C., Gault, D., Giacchini, B., Haymes, T., Herald, D., Ishida, M.,
58	OCC	Iverson, E., Kerr, S., Manek, J., McKay, G., Messner, S., Pratt, A., Sandy, R.,
58	OCC	Watanabe, H., Yamamura, H. & Yoshida, H.
61	OCC	Perello, C., Frappa, E., Janik, T., Kattentidt, B., Polak, J., Rottenborn, M. &
61	OCC	Selva, A.
66	OCC	Gault, D., Barry, T., Nosworthy, P., Hanna, W., Messner, S., Oesper, D., Dunford,
66	OCC	R., Trank, R., Preston, S. & Herald, D.
71	OCC	Frappa, E., Zeleny, P., Baruffetti, P., Bendjeddou, A., Bigi, M., Bouazara, O.,
71	OCC	Gacem, A., Khenifer, H.M., Mokhtari, L., Nosal, P., Rayane, H., Selimi, T.E.M.,
71	OCC	Sposetti, S. & Aissa, D.B.
72	OCC	Hayamizu, T., Soma, M., Watanabe, Hi., Asai, A., Watanable, Ha., Akira, A.,
72	OCC	Ida, M., Uchiyama, S., Nagata, T., Yamamura, H., Owada, M. & Yamashita, M.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
06377+1624	OCC9011	Aa,Ab	1991	1	126	0.1	1.90	7.50			063742.70+162357.3
06377+1624	OCC9011	Aa,Ab	2012	2	260	0.4	1.90	7.50	A0IV	N	063742.70+162357.3

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WDS 06377+1624 OCC 9011 Aa,Ab (Alhena) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 06377+1624 OCC 9011 Aa,Ab (Alhena) : MEASURES

No records found.

WDS 06377+1624 (Alhena) : VIRTUAL EYEPIECE

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WDS 06377+1624 (Alhena) : ALADIN DSS IMAGE @

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

Error -22130
Not valid ID.

Error -22130
Not valid ID.
Error -27220
Not valid ID.