To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

How to transfigure the Wikipedia

Would you like Wikipedia to always look as professional and up-to-date? We have created a browser extension. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology.

Try it — you can delete it anytime.

Install in 5 seconds
4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Languages
Recent
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
Great Wikipedia has got greater.
.
Leo
Newton
Brights
Milds

45 Draconis

From Wikipedia, the free encyclopedia

This article is about d Draconis. It is not to be confused with δ Draconis.
45 Draconis
Location of 45 Dra (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 18h 32m 34.52197s[1]
Declination +57° 02′ 44.1416″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type F7Ib[3]
B−V color index +0.59[2]
Astrometry
Radial velocity (Rv)−12.50[4] km/s
Proper motion (μ) RA: 0.400[1] mas/yr
Dec.: −7.674[1] mas/yr
Parallax (π)0.9287 ± 0.0913 mas[1]
Distance3,500 ± 300 ly
(1,100 ± 100 pc)
Absolute magnitude (MV)−3.5[5]
Details
Mass8.2[3] M☉
Radius62[6] R☉
Luminosity5,450[7] L☉
Surface gravity (log g)2.1[3] - 2.4[5] cgs
Temperature6,151[5] K
Metallicity [Fe/H]−0.04[5] dex
Rotational velocity (v sin i)10[3] km/s
Age33[8] Myr
Other designations
d Draconis, 45 Dra, BD+56° 2113, FK5 3475, HD 171635, HIP 90905, HR 6978, SAO 31039[9]
Database references
SIMBADdata

45 Draconis is a single[10] star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth.[1] 45 Draconis is the Flamsteed designation, while it has the Bayer designation of d Draconis. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.78.[2] Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.[4]

Lyubimkov et al. (2012) assigned this star a stellar classification of F7Ib,[3] matching an F-type supergiant. It is approximately 33 million years old with 8.2[3] times the mass of the Sun and about 62[6] times the Sun's radius. The star is radiating 5,450[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,151 K.[5]

YouTube Encyclopedic

  • 1/1
    Views:
    4 743
  • The Infernal Empire

Transcription

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. ^ a b c 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 e f 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 (1): 11–26. arXiv:1212.6057. Bibcode:2012MNRAS.427...11L. doi:10.1111/j.1365-2966.2012.21617.x. S2CID 119191810.
  4. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  5. ^ a b c d e 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:1204.4115. Bibcode:2012MNRAS.423.3268K. doi:10.1111/j.1365-2966.2012.21117.x. S2CID 118683158.
  6. ^ a b 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/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  7. ^ a b 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 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  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:0911.1335. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x. S2CID 119096173.
  9. ^ "d Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-24.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.


This page was last edited on 24 February 2023, at 19:04
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.
Contact WIKI 2
Introduction
Terms of Service
Privacy Policy