Pi Draconis

Short description: Star in the constellation Draco

Pi Draconis

Location of π Draconis (circled in red)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Draco
Right ascension |  19h 20m 40.09333s[1]
Declination | +65° 42′ 52.3095″[1]
Apparent magnitude (V) | 4.59[2]
Characteristics
Spectral type | A2 IIIs[3][4]
U−B color index | +0.06[2]
B−V color index | +0.02[2]
Astrometry
Radial velocity (Rv)| −28.1±1.1[5] km/s
Proper motion (μ)|  RA: +15.09[1] mas/yr
Dec.: +41.12[1] mas/yr
Parallax (π)| 14.25 ± 0.12[1] mas
Distance| 229 ± 2 ly
(70.2 ± 0.6 pc)
Absolute magnitude (MV)| +0.37[6]
Details
Mass| 2.70[7] M☉
Radius| 3.2[8] R☉
Luminosity| 60[9] L☉
Surface gravity (log g)| 3.80[10] cgs
Temperature| 9,125[10] K
Metallicity [Fe/H]| 0.42[6] dex
Rotational velocity (v sin i)| 26±1[3] km/s
Age| 350[7] Myr
Other designations

π Dra, 58 Dra, BD+65°1345, FK5 3547, HD 182564, HIP 95081, HR 7371, SAO 18299[11]

Database references
SIMBAD| data

Pi Draconis, Latinized from π Draconis, is a solitary[7][4] star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of 4.59.[2] Based upon an annual parallax shift of 14.25 mas as measured from Earth,[1] it is located around 229 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.063±0.10 due to interstellar dust.[12]

With an age of 350 million years, this is an A-type star of stellar classification A2 IIIs,[3][4] where the luminosity class of III typically indicates an evolved giant star and the 's' means the spectrum displays sharp absorption lines. It is a candidate Am star,[10] meaning there are some chemical peculiarities. The measured angular size is 0.427±0.062 arc seconds.[12] At the estimated distance of Pi Draconis, this yields a physical size of about 3.2 times the radius of the Sun.[8] It has about 2.70[7] times the mass of the Sun and is radiating 60[9] times the solar luminosity from its photosphere at an effective temperature of 9,125 K.[10]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
2. ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
3. ↑ 3.0 3.1 3.2 Royer, F. et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
4. ↑ 4.0 4.1 4.2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
5. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
7. ↑ 7.0 7.1 7.2 7.3 De Rosa, R. J. et al. (January 2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society 437 (2): 1216–1240, doi:10.1093/mnras/stt1932, Bibcode: 2014MNRAS.437.1216D.
8. ↑ 8.0 8.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:

2⋅R*=(70.2⋅0.427⋅10−3) AU0.0046491 AU/R⨀≈6.4⋅R⨀
9. ↑ 9.0 9.1 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
10. ↑ 10.0 10.1 10.2 10.3 Yüce, Kutluay; Adelman, Saul J. (April 2014), "Elemental Abundance Analyses with DAO Spectrograms. XXXIV. A Three-Dimensional Graphical Examination of the Elemental Abundances of the Mercury-Manganese and Metallic-Line Stars", Publications of the Astronomical Society of the Pacific 126 (938): 345, doi:10.1086/676335, Bibcode: 2014PASP..126..345Y.
11. ↑ "pi. Dra". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=pi.+Dra.
12. ↑ 12.0 12.1 van Belle, Gerard T.; von Braun, Kaspar (2009), "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars", The Astrophysical Journal 694 (2): 1085–1098, doi:10.1088/0004-637X/694/2/1085, Bibcode: 2009ApJ...694.1085V.

* v
* t
* e

Draco constellation

Stars
(list)|

| Bayer|

* α (Thuban)
* β (Rastaban)
* γ (Eltanin)
* δ (Altais)
* ε (Tyl)
* ζ (Aldhibah)
* η (Athebyne)
* θ
* ι (Edasich)
* κ
* λ (Giausar)
* μ (Alrakis)
* ν (Kuma)
* ξ (Grumium)
* ο
* π
* ρ
* σ (Alsafi)
* τ
* υ
* φ
* χ
* ψ1 (Dziban)
* ψ2
* ω

|

Flamsteed|

* 6
* 7 (Tianyi)
* 8 (Taiyi)
* 10 (i)
* 15 (A)
* 18 (g)
* 19 (h)
* 26
* 36
* 39 (b)
* 42 (Fafnir)
* 45 (d)
* 64 (e)
* 68

Variable|

* AG
* BY
* CL
* CM

HR|

* 3751
* 4126
* 5811
* 6237
* 6618 (Alruba)
* 6817
* 7137
* 7783

HD|

* 81817
* 101364

Gliese|

* Gliese 420
* Gliese 625
* Gliese 687

Kepler|

* 1
* 4
* 10
* 12
* 90
* 296

Other|

* G 240-72
* GD 356
* GRW +70 8247
* LP 71-82
* 2M 1237+6526
* Struve 2398
* WISE 1647+5632

Star clusters|

| Stellar streams|

* LAMOST 1

|

Nebulae|

| Planetary|

* Cat's Eye Nebula

|

Galaxies|

| NGC|

* 3147
* 4121
* 4125
* 4236
* 4319
* 4345
* 4513
* 5866
* 5879
* 5907
* 5949
* 5965
* 5982
* 5985
* 6090
* 6248
* 6285
* 6286
* 6340
* 6373
* 6394
* 6412
* 6503
* 6566
* 6621
* 6670
* 6786

|

Other|

* 3C 249.1
* 3C 305
* 3C 319
* 3C 371
* 3C 390.3
* 3C 401
* H1821+643
* HFLS3
* PGC 39058

Galaxy clusters|

* Abell 2218
* CL1358+62

Other|

* GRB 110328A
* SN 2005B
* Draco Supercluster

* List

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