19091+3436 STF 2474 AB (HD 178911)
19h 09m 04.35s +34° 35' 59.9" P.A. 262.00 sep 16.0 mag 6.78,7.88 Sp G1V dist. 42.59 pc (138.93 l.y.)
| Coord 2000 | 19091+3436 | Discov num | STF2474 | Comp | AB | Coord arcsec 2000 | 19 09 04.35 +34 35 59.9 | ||||
| Date first | 1823 | Date last | 2019 | Obs | 84 | ||||||
| Pa first | 260 | Pa last | 262 | P.A. Now (θ) | 262° | ||||||
| Sep first | 17.1 | Sep last | 15.96 | Sep. Now (ρ) | 15.96" | ||||||
| Mag pri | 6.78 | Mag sec | 7.88 | delta mag (ΔM) | 1.1 | Spectral class | G1V (yellow) | ||||
| Pri motion ra | +056 | Sec motion ra | +069 | ||||||||
| Pri motion dec | +191 | Sec motion dec | +197 | ||||||||
| Notes | N Z V (See Notes, Parallax indicates components are physical, Proper motion indicates physical) | ||||||||||
19091+3436 SYSTEM COMPONENTS
| Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
| Show | 67879 | 19 09 04 +34 35 60 | CHR 84 Aa,Ab | 2014 | 36 | 114 | 0.1 | 6.89 | 8.96 | 2.07 | Y | ||
| Show | HD 178911 | 67879 | 19 09 04 +34 35 60 | STF 2474 AB | 2019 | 84 | 262 | 16.0 | 6.78 | 7.88 | 1.10 | <=== | |
| Show | 67879 | 19 09 04 +34 35 60 | WAL 105 AC | 2017 | 5 | 126 | 97.5 | 6.78 | 11.42 | 4.64 |
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name | HD 178911 | Constellation | Lyra | SAO | 67879 | HIP | 94075 | ||||
| Tycho2 | 2648-02148-1 | Gaia DR2 | 2044341077844183040 | HD | 178911 | HR | 7272 | ||||
| GC | 26396 | ADS | 12101 | DM | BD+34 3439 | BD | BD+34 3438 | ||||
| Distance | 42.59 | Distance ly | 138.93 |
WDS 19091+3436 STF 2474 AB (HD 178911) : NOTES
| discov_num | notes | refcode |
| STF2474 | B is BD+34 3438. | |
| AB: NLTT 47474/47473 | Chm2004 | |
| AB: B is exoplanet host, P=71.5d. | Tok2014d | |
| CHR 84 | Aa,Ab: 1985.5232: This autocorrelogram was remeasured; the new results | |
| are listed here. | ||
| The paper by Tokovinin et al. (2000) also includes a combined | Tok2000a | |
| spectroscopic/astrometric solution for orbital elements and masses. | ||
| Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and | ||
| spectroscopic masses 5.43 +/- 2.10, 2.39, and 1.02 Msun, respectively. | Mlk2012 | |
| Aa,Ab: SB2, P=3.540y. | Tok2014d | |
| Combined solution by Farrington et al. (2014) yields masses 0.802 +/- | ||
| 0.055 and 0.622 +/- 0.053 Msun, as well as an orbital parallax 28.26 | ||
| +/- 1.70 mas. | CIA2014a |
REFERENCES
| refcode | metd | author | reference |
| Chm2004 | E - | Chaname, J. & Gould, A. | 2004ApJ...601..289C |
| Chm2004 | ApJ 601, 289, 2004 | ||
| Chm2004 | (Photometry, coordinates, and astrometry from rNLTT. Astrometry from early | ||
| Chm2004 | versions of 2MASS and UCAC, with date given only as "circa 2000". Measures | ||
| Chm2004 | identical to discovery observations - predominantly close pairs - were assumed | ||
| Chm2004 | not new observations, so not included in WDS. Similar concerns when primary and | ||
| Chm2004 | secondary magnitudes or proper motions were the same.) | ||
| CIA2014a | Kf j | Farrington, C.D., ten Brummelaar, T.A., Mason, B.D., Hartkopf, W.I., Mourard, D., | 2014AJ....148...48F |
| CIA2014a | +Kc | Moravveji, E., McAlister, H.A., Turner, N.H., Sturmann, L., & Sturmann, J. | |
| CIA2014a | +orb | AJ 148, 48, 2014 | |
| Mlk2012 | not - | Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. | 2012A&A...546A..69M |
| Mlk2012 | A&A 546, A69, 2012 | ||
| Tok2000a | S u | Tokovinin, A.A., Griffin, R.F., Balega, Y.Y., Pluzhnik, E.A., & Udry, S. | 2000AstL...26..116T |
| Tok2000a | +orb | SvAL 26, 116, 2000 | |
| Tok2014d | E2 - | Tokovinin, A. | 2014AJ....147...86T |
| Tok2014d | AJ 147, 86, 2014 |
DISCOVERER
| idgroup | discov | author |
| 1 | CHR | Center for High Ang. Res. Astronomy (speckle interferometry systems) |
| 3 | STF | Struve, F.G.W. |
| 36 | WAL | Wallenquist, A. |
WDS HISTORIC DATA
| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
| 19091+3436 | STF2474 | AB | 2007 | 66 | 263 | 15.7 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2008 | 67 | 263 | 16.0 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2010 | 68 | 263 | 15.5 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2012 | 69 | 263 | 15.9 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2013 | 70 | 262 | 16.0 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2014 | 76 | 263 | 15.9 | 6.78 | 7.88 | G1V | NZDV | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2017 | 79 | 263 | 15.9 | 6.78 | 7.88 | G1V | NZ V | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2018 | 83 | 264 | 15.9 | 6.78 | 7.88 | G1V | NZ V | 190904.35+343559.9 |
| 19091+3436 | STF2474 | AB | 2019 | 84 | 263 | 16.0 | 6.78 | 7.88 | G1V | NZ V | 190904.35+343559.9 |
If you need more information about this double, apply for a data request form to the WDS.
WDS 19091+3436 STF 2474 AB (HD 178911) : VISUAL OBSERVATIONS REPORTS
| Show | date | username | difficulty | separation | pa_estim | interest | notes |
| Show | 23/11/25 | Diego Vercelli | very easy | separated | 260 | interesting | In the same FOV STF2470 |
| Show | 22/09/16 | daedalus1 | mean difficulty | separated | 263 | Seeing: Pickering 4, poor. Measure: theta 263, rho 16.0 +/- 0.0. Beautiful star. STF 2470 is a mirror to STF 2474 which is very close, 10' to the NW. 12 measures were taken. All were the same because (I suppose) the separation matched the eyepiece calibration factor exactly. I did not have to interpolate between the lines. |
WDS 19091+3436 STF 2474 AB (HD 178911) : MEASURES
WDS 19091+3436 (HD 178911) : 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 19091+3436 (HD 178911) : ALADIN DSS IMAGE @
Error -22130
Not valid ID.
Not valid ID.
Error -22130
Not valid ID.
Error -27220
Not valid ID.
Not valid ID.
Error -27220
Not valid ID.