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Doubles in session


Current system
21287+7034
STF 2806 AB
Alfirk


Nearby doubles
3' : 21275+7028
SHR 1

9' : 21274+7028
CSR 1

10' : 21289+7024
BKO 772

16' : 21319+7034
H 5 28AB

18' : 21309+7020
CSR 2AB

20' : 21322+7025
KPP2361

33' : 21327+7009
MLB 366

35' : 21331+7059
MLB 367

39' : 21363+7025
MLB 368

46' : 21277+7119
LDS1953

56' : 21362+7115
MLR 249

57' : 21201+7112
HJ 3027

63' : 21326+7134
HJ 3044

64' : 21209+6944
MLB 365

70' : 21399+6953
KPP1602

77' : 21148+7003
MLB 364

81' : 21195+6928
MLB 304

87' : 21115+7050
HDS3019AB

98' : 21233+7207
LSC 98

98' : 21267+7211
TDT2971

100' : 21343+7210
TDT3036

107' : 21114+7140
OSO 143

121' : 21257+7233
HJ 3035AB

121' : 21391+6846
MLB 305

125' : 21480+6920
STF2835

131' : 21431+7225
NSN 747



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.
 
 
WDS 21287+7034 STF 2806 AB (Alfirk) : NOTES
 
 
discov_num notes refcode
LAB 6 Aa,Ab: bet Cep = 8 Cep = Alfirk. The third component was discovered
recently by speckle interferometry.
1971.48: Estimated delta m ~ 3 - 4. Attempts by Couteau (1973 private
communication) to observe the companion visually were unsuccessful,
supporting this large magnitude difference. Some anisotropic features
in the Fourier transform may indicate other companions or
circumstellar matter. Lab1974
1975.545, 1975.956: This is the primary of the system bet Cep and is
believed to be a binary of period ~50 yr. There is also evidence of
radial velocity variations. Labeyrie et al (1974) noted anisotropic Lab1974
features in the power spectrum which might indicate other companions,
but such features were not observed in the power spectrum derived from
these observations. BLM1978
Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 9.98 +/- 3.28, 12.04, 12.02 Msun, respectively. Mlk2012
Uniform disk diameter 0.274 +/- 0.016 mas,
Limb darkened diameter 0.280 +/- 0.016 mas,
Teff = 29500 +/- 2500 K based on LDD.
Radius is 7.22 +/- 0.42 \rsun. CIA2019a
STF2806 AB: H 3 6. MEv2010
AB: Additional notes may be found in Dembowski (1883). D__1883
 
 
REFERENCES
 
 
refcode metd author reference
BLM1978 S j Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C. 1978MNRAS.183..701M
BLM1978 MNRAS 183, 701, 1978
CIA2019a not j Gordon, K.D., Gies, D.R., Schaefer, G.H., Huber, D. & Ireland, M. 2019ApJ...873...91G
CIA2019a
D__1883 Ma - Dembowski, H. ...................
D__1883 Misure micrometriche di Stelle Doppie e multiple...
D__1883 (Rome, Coi tipi del Salviucci), vol. I, 1883
Lab1974 S j Labeyrie, A., Bonneau, D., Stachnik, R.V., & Gezari, D.Y. 1974ApJ...194L.147L
Lab1974 +orb ApJ 194, L147, 1974
Lab1974 (data from Hale 5m, KPNO 3.8m, 2.1m. Aperture listed as mean value of 3.6m unless
Lab1974 specifically given in paper)
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
 
 
DISCOVERER
 
 
discov author
BLM Morgan, B.L., Beddoes, D.R., Scaddan, R.J. & Dainty, J.C.
CIA McAlister, H.A., ten Brummelaar, T.A., Gies, D.R., Huang, W., Bagnuolo, Jr., W.G.,
CIA Shure, M.A., Sturmann, J., Sturmann, L., Turner, N.H., Taylor, S.F., Berger, D.H.,
CIA Baines, E.K., Grundstrom, E. & Ogden, C.
CIA Berger, D.H., Gies, D.R., McAlister, H.A., ten Brummelaar, T.A., Henry, T.J.,
CIA Sturmann, J., Sturmann, L., Turner, N.H., Ridgway, S.T., Aufdenberg, J.P. &
CIA Di Holco, E., Absil, O., Augereau, J.-C., Merand, A., Coude du Foresto, V.,
CIA Thevenin, F., Defrere, D., Kervella, P., ten Brummelaar, T.A., McAlister, H.A.,
CIA Ridgway, S.T., Sturmann, J., Sturmann, L. & Turner, N.H.
CIA Zhao, M., Gies, D., Monnier, J.D., Thureau, N., Pedretti, E., Baron, F.,
CIA Merand, A., ten Brummelaar, T., McAlister, H., Ridgway, S.T., Turner, N.,
CIA Sturmann, J., Sturmann, L., Farrington, C., & Goldfinger, P.J.
CIA Baines, E.K., McAlister, H.A., ten Brummelaar, T.A., Turner, N.H., Sturmann, J.,
CIA Sturmann, L., Goldfinger, P.J. & Ridgway, S.T.
CIA Boyajian, T.S., McAlister, H.A., Baines, E.K., Gies, D.R., Henry, T., Jao, W.-C.,
CIA O'Brien, D., Raghavan, D., Touhami, Y., ten Brummelaar, T.A., Farrington, C.,
CIA Goldfinger, P.J., Sturmann, L., Sturmann, J., Turner, N.H. & Ridgway, S.
CIA Kervella, P., Merand, A., Pichon, B., Thevenin, F., Heiter, U., Bigot, L.,
CIA ten Brummelaar, T.A., McAlister, H.A., Ridgway, S.T., Turner, N., Sturmann, J.,
CIA Sturmann, L., Goldfinger, P.J. & Farrington, C.
CIA Baines, E.K., McAlister, H.A., ten Brummelaar, T.A., Sturmann, J., Sturmann, L.,
CIA Turner, N.H. & Ridgway, S.T.
CIA Boyajian, T.S., McAlister, H.A., Cantrell, J.R., Gies, D.R., ten Brummelaar, T.A.,
CIA Farrington, C., Goldfinger, P.J., Sturmann, L., Sturmann, J., Turner, N.H. &
CIA Farrington, C.D., ten Brummelaar, T.A., Mason, B.D., Hartkopf, W.I., McAlister,
CIA H.A., Raghavan, D., Turner, N.H., Sturmann, L., Sturmann, J., & Ridgway, S.T.
CIA Baines, E.K., Dollinger, M.P., Cusano, F., Guenther, E.W., Hatzes, A.P.,
CIA McAlister, H.A., ten Brummelaar, T.A., Turner, N.H., Sturmann, J., Sturmann, L.,
CIA Goldfinger, P.J., Farrington, C.D. & Ridgway, S.T.
CIA ten Brummelaar, T.A., O'Brien, D.P., Mason, B.D., Farrington, C.D.,
CIA Fullerton, A.W., Gies, D.R., Grundstrom, E.D., Hartkopf, W.I., et al.
CIA O'Brien, D.P., McAlister, H.A., Raghavan, D., Boyajian, T.S.,
CIA ten Brummelaar, T.A., Sturmann, J., Sturmann, L., Turner, N.H., & Ridgway, S.
CIA Monnier, J.D., Zhao, M., Pedretti, E., Millan-Gabet, R., Berger, J.-P., Traub, W.,
CIA Schloerb, F.P., ten Brummelaar, T., McAlister, H., Ridgway, S., Sturmann, L.,
CIA Sturmann, J., et al.
CIA Raghavan, D., Farrington, C.D., ten Brummelaar, T.A., McAlister, H.A.,
CIA Ridgway, S.T., Sturmann, L., Sturmann, J., & Turner, N.H.
CIA Baron, F., Monnier, J., Pedretti, E., Zhao, M., Schaefer, G., Parks, R., Che, X.,
CIA Thureau, N., ten Brummelaar, T.A., McAlister, H.A., Ridgway, S.T., Farrington, C.,
CIA Sturmann, J., Sturmann, L., & Turner, N.
CIA Che, X., Monnier, J.D., Tycner, C., Kraus, S., Zavala, R.T., Baron, F., Pedretti,
CIA E., ten Brummelaar, T., McAlister, H., Ridgway, S.T., Sturmann, J., Sturmann, L.,
CIA & Turner, N.
CIA Baines, E.K., White, R.J., Huber, D., Jones, J., Boyajian, T., McAlister, H.A.,
CIA ten Brummelaar, T.A., Turner, N.H., Sturmann, J., Sturmann, L., Goldfinger, P.J.,
CIA Farrington, C.D., Riedel, A.R., Ireland, M., von Braun, K. & Ridgway, S.T.
CIA Boyajian, T.S., McAlister, H.A., van Belle, G., Gies, D.R., ten Brummelaar, T.A.,
CIA von Braun, K., Farrington, C., Goldfinger, P.J., O'Brien, D., Parks, J.R.,
CIA Richardson, N.D., Ridgway, S., Schaefer, G., Sturmann, L., Sturmann, J., Touhami,
CIA Y., Turner, N.H. & White, R.
CIA Boyajian, T.S., von Braun, K., van Belle, G., McAlister, H.A., ten Brummelaar,
CIA T.A., Kane, S.R., Muirhead, P.S., Jones, J., White, R., Schaefer, G., Ciardi, D.,
CIA Henry, T., Lopez-Morales, M., Ridgway, S., Gies, D., Jao, W.-C., Rojas-Ayala, B.,
CIA Parks, J.R., Sturmann, L., Sturmann, J., Turner, N.H., Farrington, C., Goldfinger,
CIA ApJ 757, 112, 2012
CIA Gallenne, A., Monnier, J., Merand, A., Kervella, P., Kraus, S., Schaefer, G.H.,
CIA Gieren, W., Pietrzynski, G., Szabados, L., Che, X., Baron, F., Pedretti,E., et al.
CIA Absil, O., Defrere, D., Coude du Foresto, V., Di Folco, E., Merand, A., Augereau,
CIA J.-C., Ertel, S., Hanot, C., Kervella, P., Mollier, B., Scott, N., Che, X. et al.
CIA Boyajian, T.S., von Braun, K., van Belle, G., Farrington, C., Schaefer, G., Jones,
CIA J., White, R., McAlister, H.A., ten Brummelaar, T.A., Ridgway, S., Gies, D.R.,
CIA Sturmann, L., Sturmann, J., Turner, N.H., Goldfinger, P.J. & Vargas, N.
CIA Farrington, C.D., ten Brummelaar, T.A., Mason, B.D., Hartkopf, W.I., Mourard, D.,
CIA Moravveji, E., McAlister, H.A., Turner, N.H., Sturmann, L., & Sturmann, J.
CIA von Braun, K., Boyajian, T.S., van Belle, G.T., Kane, S.R., Jones, J., Farrington,
CIA C., Schaefer, G., Vargas, N., Scott, N., ten Brummelaar, T.A., Kephart, M., Gies,
CIA D.R., Ciardi, D.R., Lopez-Morales, M., Mazingue, C., McAlister, H.A., Ridgway, S.,
CIA Goldfinger, P.J., Turner, N.H. & Sturmann, L.
CIA Mourard, D., Monnier, J., Meilland, A., Gies, D., Millour, F., Benisty, M.,
CIA Che, X., Grundstrom, E.D., Ligi, R., Schaefer, G., Baron, F., Kraus, S.,
CIA Zhao, M., Pedretti, E., Berio, P., Clausse, J.M., Nardetto, N., Perraut, K.,
CIA Spang, A., Stee, P., Tallon-Bose, I., McAlister, H., ten Brummelaar, T.,
CIA Ridgway, S.T., Sturmann, J., Sturmann, L., Turner, N. & Farrington, C.
CIA Roettenbacher, R.M., Monnier, J., Henry, G.W., Fekel, F.C., Williamson, M.H.,
CIA Pourbaix, D., Latham, D.W., Latham, C.A., Torres, G., Baron, F., Che, X.,
CIA Kraus, S., et al.
CIA Roettenbacher, R.M., Monnier, J., Fekel, F.C., Henry, G.W., Korhonen, H.,
CIA Latham, D.W., Muterspaugh, M.W., Williamson, M.H., Baron, F.,
CIA ten Brummelaar, T.A., Che, X., Harmon, R.O., et al.
CIA Boyajian, T., von Braun, K., Feiden, G.A., Huber, D., Basu, S., Demarque, P.,
CIA Fischer, D.A., Schaefer, G., Mann, A.W., White, T.T., Maestro, V., Brewer, J.,
CIA Lamell, C.B., Spada, F., Lopez-Morales, M., Ireland, M., Farrington, C., van Belle,
CIA G.T., Kane, S.R., Jones, J., ten Brummelaar, T.A., Ciardi, D.R., McAlister, H.A.,
CIA Ridgway, S., Goldfinger, P.J., Turner, N.H. & Sturmann, L.
CIA Gallenne, A., Merand, A., Kervella, P., Monnier, J., Schaefer, G.H.,
CIA Roettenbacher, R.M., Gieren, W., Pietrzynski, G., McAlister, H.A.,
CIA ten Brummelaar, T.A., Sturmann, J., Sturmann, L., Turner, N.H., & Anderson, R.I.
CIA Richardson, N.D., Shenar, T., Roy-Loubier, O., Schaefer, G., Moffat, A.F.J.,
CIA St-Louis, N., Gies, D.R., Farrington, C., Hill, G.M., Williams, P.M.,
CIA Gordon, K., Pablo, H., & Ramiaramanantsoa, T.
CIA Schaefer, G.H., Hummel, C.A., Gies, D.R., Zavala, R.T., Monnier, J.D.,
CIA Walter, F.M., Turner, N.H., Baron, F., ten Brummelaar, T., Che, X.,
CIA Farrington, C.D., Kraus, S., Sturmann, J., & Sturmann, L.
CIA Gardner, T., Monnier, J.D., Fekel, F.C., Williamson, M., Duncan, D.K., White, T.R.,
CIA Ireland, M., Adams, F.C., Barman, T., Baron, F., ten Brummelaar, T., Che, X.,
CIA Huber, D., Kraus, S., Roettenbacher, R.M., Schaefer, G., Sturmann, J., Sturmann, L.,
CIA ApJ 855, 1, 2018
CIA Schaefer, G.H., White, R.J., Baines, E.K., Boyajian, T.S., ten Brummelaar, T.A.,
CIA White, T.R., Huber, D., Mann, A.W., Casagrande, L., Grunblatt, S.K., Justesen,
CIA Farrington, C.D., Fekel, F.C., Schaefer, G.H. & ten Brummelaar, T.A.
CIA Lester, K.V., Gies, D.R., Schaefer, G.H., Farrington, C.D., Monnier, J.D.,
CIA Lester, K.V., Gies, D.R., Schaefer, G.H., Farrington, C.D., Guo, Z., Matson, R.A.,
CIA Lester, K.V., Fekel, F.C., Muterspaugh, M., Gies, D.R., Schaefer, G.H., Farrington,
CIA Thomas, J.D., Richardson, N.D., Eldridge, J.J., Schaefer, G., Monnier, J.D.,
CIA Sana, H., Moffat, A.F.J., Williams, P., Corcoran, M.F., Stevens, I.R., Weigelt, G.,
CIA Zainol, F.D., Anugu, N., Le Bouquin, J.-B., ten Brumelaar, T.A., Campos, F., et al.
CIA Klement, R., Hadrava, P., Rivinius, T., Baade, D., Cabezas, M., Heida, M.,
CIA Schaefer, G.H., Gardner, T., Gies, D.R., Anugu, N., Lanthermann, C., Davies, C.L.,
CIA Anderson, M.D., Monnier, J.D., Ennis, J., Labdon, A., Setterholm, B.R., Kraus, S.,
CIA ten Brummelaar, T.A. & Le Bouquin, J.-B.
CIA Gardner, T., Monnier, J.D., Fekel, F.C., Williamson, M., Baron, F., Hinkley, S.,
CIA Gardner, T., Monnier, J.D., Fekel, F.C., Schaefer, G., Johnson, K.J.C., Le Bouquin,
CIA Richardson, N.D., Lee, L., Schaefer, G., Shenar, T., Sander, A.A.C., Hill, G.M.,
CIA Klement, R., Schaefer, G.H., Gies, D.R., Wang, L., Baade, D., Rivinius, T.,
CIA Schaefer, G., Anugu, N., ten Brummelaar, T., Farrington, C., Gies, D., Jones, J.,
CIA Morales, L.M., Sandquist, E.L., Schaefer, G.H., Farrington, C.D., Klement, R.,
CIA Torres, G., Schaefer, G.H., Monnier, J.D., Anugu, N., Davies, C.L., Ennis, J.,
CIA Farrington, C.D., Gardner, T., Klement, R., Kraus, S., Labdon, A., Lanthermann, C.,
CIA Lester, K.V., Schaefer, G.H., Fekel, F.C., Gies, D.R., Henry, T.J., Jao, W.-C.,
CIA Gardner, T., Monnier, J.D., Fekel, F.C., Le Bouquin, J.-B., Scovera, A., Schaefer,
CIA Klement, R., Baade, D., Rivinius, T., Gies, D.R., Wang, L., Labadie-Bartz, J.,
CIA De Furio, M., Gardner, T., Monnier, J., Meyer, M.R., Kratter, K., Schaefer, G.,
CIA Lanthermann, C., Le Bouquin, J.-B., Sana, H., Merand, A., Monnier, J.D., Perrault,
CIA K., Frost, A.J., Mahy, L., Gosset, E., De Becker, M., Kraus, S., Aruga, N. et al.
CIA Lam, R., Sandquist, E.L., Schaefer, G.H., Farrington, C.D., Monnier, J.D., Anugu,
CIA AJ 166, 29, 2023
CIA Klement, R., Rivinius, T., Gies, D.R., Baade, D., Merand, A., Monnier, J.D.,
CIA Echeverri, D., Xuan, J.W., Monnier, J.D., Delorme, J.-R., Wang, J.J., Jovanovic,
CIA Evans, N.R., Schaefer, G.H., Gallenne, A., Torres, G., Horch, E.P., Anderson, R.I.,
CIA Torres, G., Schaefer, G.H., Stefanik, R.P., Latham, D.W., Boden, A.F., Anugu, N.,
CIA Evans, N.R., Gallenne, A., Kervella, P., Merand, A., Monnier, J., Anderson, R.I.,
CIA Kuraszkiewicz, J., Anugu, N., Roettenbacher, R.M., Lanthermann, C., Gutierrez, M.,
CIA Richardson, N.D., Schaefer, G.H., Eldridge, J.J., Spejcher, R., Holdsworth, A.,
CIA Holdsworth, A., Richardson, N.D., Schaefer, G.H., Eldridge, J.J., Hill, G.M.,
CIA Shepard, K., Gies, D.R., Schaefer, G.H., Anugu, N., Baron, F.R., Lanthermann, C.,
CIA Danner, C.A., Sandquist, E.L., Schaefer, G.H., Bedin, L.R., Farrington, C.D.,
CIA De Furio, M., Gardner, T., Monnier, J.D., Meyer, M.R., Kratter, K.M., Lanthermann,
CIA Torres, G., Tkachenko, A., Pavlovski,K., Gossage, S., Schaefer, G.H., Melis. C.,
D Dembowski, H.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr dm_number notes coord_arcsec_2000
21287+7034 STF2806 AB 2007 94 249 13.1 3.17 8.63 D 212839.58+703338.5
21287+7034 STF2806 AB 2009 97 250 14.1 3.17 8.63 N D 212839.58+703338.5
21287+7034 STF2806 AB 2011 98 251 14.4 3.17 8.63 N D 212839.58+703338.5
21287+7034 STF2806 AB 2013 102 248 14.1 3.17 8.63 B1IV N D 212839.58+703338.5
21287+7034 STF2806 AB 2016 103 251 13.5 3.17 8.63 B1IV N 212839.58+703338.5
21287+7034 STF2806 AB 2020 104 250 13.6 3.17 8.63 B1IV N 212839.58+703338.5
21287+7034 STF2806 AB 2024 105 248 13.5 3.17 8.63 B1IV N 212839.58+703338.5

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