HD 161693

HD 161693  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Draco
Right ascension |  17h 43m 59.17049s[1]
Declination | +54° 48′ 06.1637″[1]
Apparent magnitude (V) | 5.76[2]
Characteristics
Spectral type | A0V[3]
Astrometry
Radial velocity (Rv)| −2.0[4] km/s
Proper motion (μ)|  RA: 17.450[1] mas/yr
Dec.: −18.125[1] mas/yr
Parallax (π)| 7.1436 ± 0.0605[1] mas
Distance| 457 ± 4 ly
(140 ± 1 pc)
Details
Mass| 2.4[5] M☉
Surface gravity (log g)| 4.0[5] cgs
Temperature| 10,000[5] K
Age| 58[5] Myr
Other designations

Alruba, HD 161693, HR 6618, BD+53° 1978, HIP 86782, SAO 30538[6]

Database references
SIMBAD| data

HD 161693, also designated HR 6618 and named Alruba,[7] is a star in the northern circumpolar constellation of Draco. Based on parallax measurements obtained during the Gaia mission, it is about 457 light-years (140 parsecs) distant from the Sun.

## Nomenclature

HD 161693 is the star's entry in the Henry Draper Catalogue and HR 6618 that in the Bright Star Catalogue.

It bore the traditional name Al Ruba, Arabic for "the Camel's Foal", a member of the Mother Camels asterism in early Arabic astronomy.[8][9] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[10] to catalogue and standardize proper names for stars. The WGSN approved the name Alruba for this star on 1 June 2018 and it is now so entered on the List of IAU-approved Star Names.[7]

## Properties

This star is a A-type main sequence star with a stellar classification of A0 V.[3]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
2. ↑ Oja, T. (March 1985), "UBV photometry of stars whose positions are accurately known. II", Astronomy and Astrophysics Supplement Series 59: 461–464, Bibcode: 1985A&AS...59..461O
3. ↑ 3.0 3.1 Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
4. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
5. ↑ 5.0 5.1 5.2 5.3 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars". The Astronomical Journal 152 (2): 40. doi:10.3847/0004-6256/152/2/40. Bibcode: 2016AJ....152...40G.
6. ↑ "HD 161693 -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+161693&submit=submit+id, retrieved 2018-07-01.
7. ↑ 7.0 7.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/. Retrieved 2018-07-01.
8. ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (rep. ed.). New York City , NY: Dover Publications Inc.. p. 207–212. ISBN 0-486-21079-0.
9. ↑ Garfinkle, Robert A. (2008). Star-Hopping: Your Visa to Viewing the Universe (2nd ed.). Cambridge University Press. p. 183. ISBN 978-0521598897. https://books.google.com/?id=40JzBYGREL0C&pg=PA183&dq=protecting+"Mother+Camels"+Draco#v=onepage&q=baby "Mother Camels" Draco&f=false. Retrieved 16 October 2016.
10. ↑ "International Astronomical Union | IAU". https://www.iau.org/science/scientific_bodies/working_groups/280/.

* 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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