45 Draconis

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45 Draconis
Draco constellation map.svg
Red circle.svg

Location of 45 Dra (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 18h 32m 34.52235s[1]
Declination +57° 02′ 44.1531″[1]
Apparent magnitude (V) 4.78[2]
Spectral type F7Ib[3]
B−V color index +0.59[2]
Radial velocity (Rv) −12.50[4] km/s
Proper motion (μ) RA: 0.08[1] mas/yr
Dec.: −7.45[1] mas/yr
Parallax (π) 1.54 ± 0.18[1] mas
Distance approx. 2,100 ly
(approx. 650 pc)
Absolute magnitude (MV) −3.5[5]
Mass 8.2[3] M
Radius 62[6] R
Luminosity 5,450[7] L
Surface gravity (log g) 2.1[3] - 2.4[5] cgs
Temperature 6,151[5] K
Metallicity [Fe/H] −0.04[5] dex
Rotational velocity (v sin i) 10[3] km/s
Age 33[8] Myr
Other designations
d Dra, 45 Dra, HR 6978, BD+56°2113, HD 171635, SAO 31039, FK5 3475, HIP 90905
Database references

45 Draconis (d Dra) is a yellow supergiant star located in the constellation of Draco. It is approximately 33 million years old.


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  2. ^ a b Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137. 
  3. ^ a b c d Lyubimkov, Leonid S.; Lambert, David L.; Kaminsky, Bogdan M.; Pavlenko, Yakov V.; Poklad, Dmitry B.; Rachkovskaya, Tamara M. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 427: 11. arXiv:1212.6057Freely accessible. Bibcode:2012MNRAS.427...11L. doi:10.1111/j.1365-2966.2012.21617.x. 
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ a b c d Kovtyukh, V. V.; Gorlova, N. I.; Belik, S. I. (2012). "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants". Monthly Notices of the Royal Astronomical Society. 423 (4): 3268. arXiv:1204.4115Freely accessible. Bibcode:2012MNRAS.423.3268K. doi:10.1111/j.1365-2966.2012.21117.x. 
  6. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics. 367 (2): 521. arXiv:astro-ph/0012289Freely accessible. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. 
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ Lyubimkov, Leonid S.; Lambert, David L.; Rostopchin, Sergey I.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369. arXiv:0911.1335Freely accessible. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x.