15232+3017 STF 1937 AB,D (Eta CrB)
15h 23m 12.23s +30° 17' 17.7" P.A. 40.00 sep 217.9 mag 4.98,11.00 Sp G0V dist. 17.86 pc (58.26 l.y.)
| Coord 2000 | 15232+3017 | Discov num | STF1937 | Comp | AB,D | Coord arcsec 2000 | 15 23 12.23 +30 17 17.7 | ||||
| Date first | 1879 | Date last | 2016 | Obs | 10 | ||||||
| Pa first | 49 | Pa last | 40.3 | P.A. Now (θ) | 40.3° | ||||||
| Sep first | 212.8 | Sep last | 217.86 | Sep. Now (ρ) | 217.86" | ||||||
| Mag pri | 4.98 | Mag sec | 11.00 | delta mag (ΔM) | 6.02 | Spectral class | G0V (yellow) | ||||
| Pri motion ra | +117 | Sec motion ra | -005 | ||||||||
| Pri motion dec | -171 | Sec motion dec | +001 | ||||||||
| Notes | N U (See Notes, Proper motion indicates non-physical) | ||||||||||
15232+3017 SYSTEM COMPONENTS
| Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
| Show | 64673 | 15 23 12 +30 17 18 | STF 1937 AB | 2020 | 1102 | 287 | 0.4 | 5.64 | 5.95 | 0.31 | Y | ||
| Show | 64673 | 15 23 12 +30 17 18 | STF 1937 AB,C | 2016 | 10 | 358 | 75.1 | 4.98 | 13.35 | 8.37 | |||
| Show | Eta CrB | 64673 | 15 23 12 +30 17 18 | STF 1937 AB,D | 2016 | 10 | 40 | 217.9 | 4.98 | 11.00 | 6.02 | <=== | |
| Show | 64673 | 15 23 12 +30 17 18 | KIR 4 AB,E | 2010 | 2 | 137 | 193.6 | 4.98 | 17.00 | 12.02 |
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name | Eta CrB | Var name | NSV7054 CrB | Constellation | Corona Borealis | SAO | 64673 | ||||
| HIP | 75312 | Tycho2 | 2563-01366-1 | HD | 137107 | HR | 5727 | ||||
| GC | 20696 | ADS | 9617 | GL | Gl 584A | BD | BD+30 2653 | ||||
| Bayer | Eta Coronae Borealis | Bayer name | Eta CrB | Flamsteed | 2 Coronae Borealis | Flamsteed name | 2 CrB | ||||
| Distance | 17.86 | Distance ly | 58.26 | Bayer greek | η CrB |
WDS 15232+3017 STF 1937 AB,D (Eta CrB) : NOTES
| discov_num | notes | refcode |
| STF1937 | eta CrB = 2 CrB. | |
| See Baize & Petit (1989) catalog of doubles with variable component. | Baz1989d | |
| Masses and bolometric magnitudes are derived for the two components of | ||
| this system by Mason et al. (1999), based on assumed spectral types | Msn1999a | |
| Spectral types and masses of components assigned by ten Brummelaar et | TtB2000 | |
| al., based on adaptive optics observations. | ||
| and available parallaxes. | ||
| Pourbaix gives combined solution for this resolved SB2, yielding | Pbx2000b | |
| orbital parallaxes and component masses. | ||
| Combined spectroscopic/astrometric solution of SB2. Calculated masses | ||
| 1.243 +/- 0.054 and 1.100 +/- 0.039 Msun, distance 18.50 +/- 0.22 pc. | Mut2010b | |
| AB: H 1 16. | MEv2010 | |
| AB: Malkov et al. (2012) derive dynamical, photometric, and | ||
| spectroscopic masses 2.11 +/- 0.09, 2.24, and 2.14 Msun, respectively. | Mlk2012 | |
| AB: SB2, P=41.628y | Tok2014d | |
| KIR 4 | AE. Data from 2MASS. Kirkpatrick et al. (2001) derive spectral types | Kir2001a |
| G1V+G3V and L8V, determine is a physical pair, separation ~3600 au. | ||
| Find that WDS C and D components of system are not physical. | ||
| STF1937 | AB,C: Rectilinear solution by Hurowitz et al. (2014). | USN2014a |
REFERENCES
| refcode | metd | author | reference |
| Baz1989d | - | Baize, P. & Petit, M. | 1989A&AS...77..497B |
| Baz1989d | A&AS 77, 497, 1989 | ||
| Kir2001a | E2 - | Kirkpatrick, J.D., Dahn, C.C., Monet, D.G., Reid, I.N., Gizis, J.E., Liebert, J., | 2001AJ....121.3235K |
| Kir2001a | & Burgasser, A.J. | ||
| Kir2001a | AJ 121, 3235, 2001 | ||
| Kir2001a | (additional magnitude information and data to derive position angles extracted | ||
| Kir2001a | from ALADIN and 2MASS data) | ||
| 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 | ||
| Msn1999a | Su j | Mason, B.D., Douglass, G.G., & Hartkopf, W.I. | 1999AJ....117.1023M |
| Msn1999a | +orb | AJ 117, 1023, 1999 | |
| Mut2010b | Kp - | Muterspaugh, M.W., Hartkopf, W.I., Lane. B.F., O'Connell, J., Williamson, M., | 2010AJ....140.1623M |
| Mut2010b | Kulkarni, S.R., Konacki, M., Burke, B.F., Colavita, M.M., Shao, M., & | ||
| Mut2010b | Wiktorowicz, S.J. | ||
| Mut2010b | AJ 140, 1623, 2010 | ||
| Pbx2000b | orb - | Pourbaix, D. | 2000A&AS..145..215P |
| Pbx2000b | A&AS 145, 215, 2000 | ||
| Tok2014d | E2 - | Tokovinin, A. | 2014AJ....147...86T |
| Tok2014d | AJ 147, 86, 2014 | ||
| TtB2000 | Ac j | ten Brummelaar, T.A., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr., | 2000AJ....119.2403T |
| TtB2000 | Turner, N.H., Hartkopf, W.I., & Bagnuolo, W.G., Jr. | ||
| TtB2000 | AJ 119, 2403, 2000 (magnitude differences from Mt. Wilson AO) | ||
| USN2014a | lin - | Hurowitz, J.L., Hartkopf, W.I., & Mason, B.D. | 2014IAUDS.182....1H |
| USN2014a | Inf. Circ. 182, 1, 2014 |
DISCOVERER
| idgroup | discov | author |
| 1 | STF | Struve, F.G.W. |
WDS HISTORIC DATA
| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
| 15232+3017 | STF1937 | AB,D | 2006 | 7 | 41 | 217.7 | 4.98 | 11.00 | F8V+G0V | NUD | 152312.23+301717.7 |
| 15232+3017 | STF1937 | AB,D | 2016 | 10 | 40 | 217.9 | 4.98 | 11.00 | G0V | NU | 152312.23+301717.7 |
If you need more information about this double, apply for a data request form to the WDS.
WDS 15232+3017 STF 1937 AB,D (Eta CrB) : VISUAL OBSERVATIONS REPORTS
WDS 15232+3017 STF 1937 AB,D (Eta CrB) : MEASURES
WDS 15232+3017 (Eta CrB) : VIRTUAL EYEPIECE
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WDS 15232+3017 (Eta CrB) : ALADIN DSS IMAGE @
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