20462+3358 CHR 100 Aa,Ab
20h 46m 12.68s +33° 58' 12.9" P.A. 350.00 sep 0.0 mag 2.46, Sp K0III dist. 22.29 pc (72.71 l.y.)
| Coord 2000 | 20462+3358 | Discov num | CHR 100 | Comp | Aa,Ab | Coord arcsec 2000 | 20 46 12.68 +33 58 12.9 | ||||
| Date first | 1983 | Date last | 1991 | Obs | 2 | ||||||
| Pa first | 0 | Pa last | 350 | P.A. Now (θ) | 350° | ||||||
| Sep first | 0.0 | Sep last | 0.041 | Sep. Now (ρ) | 0.041" | ||||||
| Mag pri | 2.46 | Mag sec | delta mag (ΔM) | Spectral class | K0III (yellow-orange) | ||||||
| Pri motion ra | +356 | Sec motion ra | |||||||||
| Pri motion dec | +331 | Sec motion dec | |||||||||
| Notes | N (See Notes) | ||||||||||
20462+3358 SYSTEM COMPONENTS
| Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
| Show | 70474 | 20 46 13 +33 58 13 | CHR 100 Aa,Ab | 1991 | 2 | 350 | 0.0 | 2.46 | <=== | ||||
| Show | Aljanah | 70474 | 20 46 13 +33 58 13 | STT 594 AB | 2017 | 21 | 261 | 79.2 | 2.46 | 11.60 | 9.14 | ||
| Show | 70474 | 20 46 13 +33 58 13 | BU 676 AC | 2017 | 4 | 269 | 79.0 | 2.46 | 13.40 | 10.94 | |||
| Show | 70474 | 20 46 13 +33 58 13 | LEP 96 AD | 2002 | 2 | 271 | 93.4 | 2.46 | 14.68 | 12.22 |
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name | Aljanah | Constellation | Cygnus | SAO | 70474 | HIP | 102488 | ||||
| Tycho2 | 2695-04139-1 | HD | 197989 | HR | 7949 | GC | 28959 | ||||
| ADS | 14274 | GL | Gl 806.1A | BD | BD+33 4018 | Bayer | Epsilon Cygni | ||||
| Bayer name | Eps Cyg | Flamsteed | 53 Cygni | Flamsteed name | 53 Cyg | FK5 | 780 | ||||
| Distance | 22.29 | Distance ly | 72.71 | Bayer greek | ε Cyg |
WDS 20462+3358 CHR 100 Aa,Ab : NOTES
| discov_num | notes | refcode |
| CHR 100 | eps Cyg = 53 Cyg = Aljanah. A spectroscopic binary. | |
| van Maanan notes a common high-proper motion companion located 1'.3 | Maa1934 | |
| west and 0'.1 south of eps Cyg. The companion (photographic magnitude | ||
| ~14.8) was found on two plates taken with the Mt. Wilson 60inch over | ||
| an interval of 12 years. | ||
| 1991.8987: This finally confirms the discovery observation of this | ||
| component, made in 1983 (McAlister et al 1987). A number of unresolved | McA1987b | |
| observations of this very close system, dating from 1979 to 1981, were | ||
| published by Hartkopf & McAlister (1984). | Hrt1984 | |
| A single lined spectroscopic binary with a period of 55 yr yields an | Grf1994 | |
| estimated semi-major axis of 1.05", so the companion has only escaped | ||
| visual resolution only due to its faintness. MK III measures of the | MkT2003 | |
| diameter and no loss of coherence rules out companions with dm < 5.7. | ||
| It is possible that CHR 100 is an artifact caused by wave-front | Tok2010b | |
| distortions in the dome. The star was likely observed near the zenith | ||
| and the separation of the putative companion is close to the first | ||
| diffraction ring, as typical for such artifacts. | ||
| Mk III Limb-darkened diameter 4.62 mas. | MkT1991 | |
| Mk III Limb-darkened diameter 4.612 +/- 0.046 mas. | MkT2003 | |
| STT 594 | AB: Optical pair, based on study of relative motion of the | |
| components using the method of apparent motion parameters. | Kiy2008 | |
| AB: Rectilinear solution by Friedman et al. (2012). | USN2012a |
REFERENCES
| refcode | metd | author | reference |
| Hrt1984 | Sc j | Hartkopf, W.I. & McAlister, H.A. | 1984PASP...96..105H |
| Hrt1984 | PASP 96, 105, 1984 | ||
| Kiy2008 | - | Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S. | 2008SvAL...32..405K |
| Kiy2008 | SvAL 34, 405, 2008 | ||
| Maa1934 | - | Maanen, A. van | 1934PASP...46..296M |
| Maa1934 | PASP 46, 296, 1934 | ||
| McA1987b | Sc j | McAlister, H.A., Hartkopf, W.I., Hutter, D.J., & Franz, O.G. | 1987AJ.....93..688M |
| McA1987b | AJ 93, 688, 1987 | ||
| MkT1991 | not j | Mozurkewich, D., Johnston, K.J., Simon, R.S., Bowers, P.F., Gaume, R., Hutter, | 1991AJ....101.2207M |
| MkT1991 | D.J., Colavita, M.M., Shao, M. & Pan, X.P. | . | |
| MkT1991 | AJ 101, 2207, 1991 | . | |
| MkT2003 | Km - | Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A., | 2003AJ....126.2502M |
| MkT2003 | +not | Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R. | |
| MkT2003 | AJ 126, 2502, 2003 | ||
| Tok2010b | S - | Tokovinin, A. | ................... |
| Tok2010b | private communication | ||
| USN2012a | lin - | Friedman, E.A., Mason, B.D., & Hartkopf, W.I. | 2012IAUDS.176....1F |
| USN2012a | Inf. Circ. 176, 1, 2012 |
DISCOVERER
| idgroup | discov | author |
| 1 | BU | Burnham, S.W. (BU 1 - 81) |
| 179 | CHR | Center for High Ang. Res. Astronomy (speckle interferometry systems) |
| 181 | LEP | Lepine, S., Wallace, D., Shara, M., Moffat, A., & Niemela, V. |
| 194 | STT | Struve, O. |
WDS HISTORIC DATA
| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
| 20462+3358 | CHR 100 | Aa,Ab | 1991 | 2 | 350 | 0.0 | 2.46 | K0III | N | 204612.43+335810.0 |
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WDS 20462+3358 CHR 100 Aa,Ab : VISUAL OBSERVATIONS REPORTS
WDS 20462+3358 CHR 100 Aa,Ab : MEASURES
WDS 20462+3358 : VIRTUAL EYEPIECE
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WDS 20462+3358 : ALADIN DSS IMAGE @
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