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
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

Delta Hydri

From Wikipedia, the free encyclopedia

δ Hydri
Location of δ Hydri (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hydrus
Right ascension 02h 21m 44.94286s[1]
Declination −68° 39′ 33.9038″[1]
Apparent magnitude (V) 4.09[2]
Characteristics
Spectral type A2 V[3]
U−B color index +0.05[2]
B−V color index +0.03[2]
Astrometry
Radial velocity (Rv)+6.00[4] km/s
Proper motion (μ) RA: -49.95[1] mas/yr
Dec.: +2.48[1] mas/yr
Parallax (π)23.35 ± 0.34 mas[1]
Distance140 ± 2 ly
(42.8 ± 0.6 pc)
Absolute magnitude (MV)0.92[3]
Details
Mass2.25[5] M☉
Radius2.3[5] R☉
Luminosity39.52[3] L☉
Surface gravity (log g)3.98[6] cgs
Temperature9,880±336[6] K
Metallicity [Fe/H]+0.12[3] dex
Rotational velocity (v sin i)162[6] km/s
Age209[6] Myr
Other designations
δ Hyi, CPD−69° 113, FK5 1065, GC 2872, HD 15008, HIP 11001, HR 705, SAO 248545
Database references
SIMBADdata

Delta Hydri, Latinized from δ Hydri, is a single,[7] white-hued star in the southern constellation of Hydrus. It is bright enough to be faintly visible to the naked eye with an apparent visual magnitude of 4.09.[2] The distance to this star, based upon an annual parallax shift of 23.35 mas,[1] is about 140 light years. It is moving away from the Sun with a radial velocity of +6 km/s.[4]

This is an ordinary A-type main-sequence star with a stellar classification of A2 V[3] It is about 209 million years old and has a high rate of spin, showing a projected rotational velocity of 162 km/s.[6] This is giving the star an oblate shape with an equatorial bulge that is 7% larger than the polar radius.[8] The star has 2.25 times the mass of the Sun and 2.3 times the Sun's radius.[5] It is radiating 39.5[3] times the Sun's luminosity from its photosphere at an effective temperature of around 9.880.[6] Delta Hydri has been checked for an infrared excess, but none was found.[7]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  4. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  5. ^ a b c Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  6. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607. Vizier catalog entry
  7. ^ a b Rodriguez, David R.; et al. (May 2015), "Stellar multiplicity and debris discs: an unbiased sample", Monthly Notices of the Royal Astronomical Society, 449 (3): 3160–3170, arXiv:1503.01320, Bibcode:2015MNRAS.449.3160R, doi:10.1093/mnras/stv483, S2CID 119237891.
  8. ^ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
This page was last edited on 14 May 2023, at 12:34
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