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NGC 6503
HST image of NGC 6503's spiral arms
Observation data (J2000 epoch)
Constellation	Draco
Right ascension	17 49 26.4207
Declination	+70° 08′ 39.587″
Redshift	0.000143
Heliocentric radial velocity	28 km/s
Distance	20.9 ± 2.2 Mly (6.40 ± 0.66 Mpc)
Apparent magnitude (V)	10.2
Characteristics
Type	SAB:(s)bc
Apparent size (V)	7.1′ × 2.4′
Other designations
IRAS 17499+7009, 2MASX J17492651+7008396, UGC 11012, LEDA 60921, MCG +12-17-009

NGC 6503 is a field dwarf spiral galaxy in the northern constellation of Draco. It was discovered by German astronomer Arthur von Auwers on July 22, 1854. The galaxy has an angular size of 7.1′ × 2.4′ and an apparent visual magnitude of 10.2. It is located at a distance of approximately 20.9 million light-years (6.40 Mpc) from the Milky Way galaxy. NGC 6503 may form the remote tip of a long chain of galaxies that extends out into the local void, forming a galaxy filament spanning 26 million light-years (8 Mpc).

The galactic plane of this galaxy is inclined at an angle of 78°±3° to the plane of the sky, with the major axis of its oval profile being aligned along a position angle of 121°. The morphological classification of NGC 6502 is SAB:(s)bc. This indicates a barred spiral galaxy (SAB:) with no inner ring structure (s) and moderately wound spiral arms (bc). However, the ':' notation indicates some uncertainty about the classification. Older works gave it a class of SA(s)bc; i.e. no bar.

A possible bar system has been reported via infrared observations, being viewed end-on from the perspective of the Earth. Ultraviolet observations show a young, inner star forming ring encircling the bar. The ring has a radius between 1 and 2.5 kpc from the core. There is a disk of neutral hydrogen that is larger in extent than the optical disk of the galaxy. This extra-planar gas is mostly the result of star formation activity, rather than cold gas that is being accreted. There is evidence for a LINER-type or Seyfert 2 nucleus.

NGC 6503 has one known satellite galaxy, known as KK 242. With a stellar mass of about 3 million solar masses, KK 242 is on the border between a dwarf irregular galaxy (dIrr) and a dwarf spheroidal galaxy (dSph).

Gallery

• NGC 6503 by Hubble Space Telescope
• NGC 6503 (HST)
• NGC 6503 from Hubble.

References

1. "NGC 6503". space telescope.org. NASA/ESA. Retrieved 11 June 2015.
2. ^ 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. Gaia DR2 record for this source at VizieR.
3. ^ "NGC 6503". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-11-29.
4. ^ Kourkchi, Ehsan; et al. (October 23, 2020). "Cosmicflows-4: The Catalog of ∼10,000 Tully–Fisher Distances". The Astrophysical Journal. 902 (2): 145. arXiv:2009.00733. Bibcode:2020ApJ...902..145K. doi:10.3847/1538-4357/abb66b. ISSN 1538-4357.
5. ^ O'Meara, Stephen James (2007). Hidden Treasures. Cambridge University Press. p. 423. ISBN 978-1-139-46373-7.
6. ^ Buta, Ronald J.; et al. (2015). "A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)". The Astrophysical Journal Supplement Series. 217 (2): 32. arXiv:1501.00454. Bibcode:2015ApJS..217...32B. doi:10.1088/0067-0049/217/2/32. S2CID 119202943.
7. ^ Blanc, Guillermo A.; et al. (2013). "The Virus-P Exploration of Nearby Galaxies (Venga): Survey Design, Data Processing, and Spectral Analysis Methods". The Astronomical Journal. 145 (5): 138. arXiv:1303.1552. Bibcode:2013AJ....145..138B. doi:10.1088/0004-6256/145/5/138. S2CID 119109864.
8. Materne, J. (April 1979). "The structure of nearby groups of galaxies - Quantitative membership probabilities". Astronomy and Astrophysics. 74 (2): 235–243. Bibcode:1979A&A....74..235M.
9. Karachentseva, Valentina E.; et al. (October 2023). "The M 101 galaxy group as a node in a nearby cosmic filament". Astronomy & Astrophysics. 678. id. A16. arXiv:2308.01897. Bibcode:2023A&A...678A..16K. doi:10.1051/0004-6361/202347085.
10. Bottema, Roelof; Gerritsen, Jeroen P. E. (October 1997). "An investigation of the structure and kinematics of the spiral galaxy NGC 6503". Monthly Notices of the Royal Astronomical Society. 290 (4): 585–597. arXiv:astro-ph/9704190. doi:10.1093/mnras/290.4.585.
11. Kuzio de Naray, Rachel; et al. (December 2012). "Searching for non-axisymmetries in NGC 6503: a weak end-on bar". Monthly Notices of the Royal Astronomical Society. 427 (3): 2523–2536. arXiv:1209.4653. Bibcode:2012MNRAS.427.2523K. doi:10.1111/j.1365-2966.2012.22126.x.
12. ^ Freeland, E.; Chomiuk, L.; Keenan, R.; Nelson, T. (March 2010). "Evidence for a Strong End-On Bar in the Ringed σ-Drop Galaxy NGC 6503". The Astronomical Journal. 139 (3): 865–870. arXiv:0912.0247. Bibcode:2010AJ....139..865F. doi:10.1088/0004-6256/139/3/865.
13. Gouliermis, Dimitrios A.; et al. (October 2015). "Hierarchical star formation across the ring galaxy NGC 6503". Monthly Notices of the Royal Astronomical Society. 452 (4): 3508–3528. arXiv:1506.03928. Bibcode:2015MNRAS.452.3508G. doi:10.1093/mnras/stv1325.
14. Greisen, Eric W.; et al. (June 2009). "Aperture Synthesis Observations of the Nearby Spiral NGC 6503: Modeling the Thin and Thick H I Disks". The Astronomical Journal. 137 (6): 4718–4733. arXiv:0902.0989. Bibcode:2009AJ....137.4718G. doi:10.1088/0004-6256/137/6/4718.
15. Koda, Jin; et al. (April 2015). "Discovery of New Dwarf Galaxy Near the Isolated Spiral Galaxy NGC 6503". The Astrophysical Journal Letters. 802 (2). id. L24. arXiv:1504.00674. Bibcode:2015ApJ...802L..24K. doi:10.1088/2041-8205/802/2/L24.
16. Karachentsev, Igor D.; et al. (2022). "KK 242, A Faint Companion to the Isolated SCD Galaxy NGC 6503". The Astronomical Journal. 163 (2): 51. arXiv:2111.14691. Bibcode:2022AJ....163...51K. doi:10.3847/1538-3881/ac3cbe. S2CID 244714422.

Further reading

• Tikhonov, N. A. (September 2014). "Stellar content and distances to the isolated spiral galaxies NGC 6503 and NGC 6946". Astronomy Letters. 40 (9): 537–550. Bibcode:2014AstL...40..537T. doi:10.1134/S1063773714090035.
• Puglielli, David; et al. (June 2010). "Dynamical Models for NGC 6503 Using a Markov Chain Monte Carlo Technique". The Astrophysical Journal. 715 (2): 1152–1169. arXiv:1002.0819. Bibcode:2010ApJ...715.1152P. doi:10.1088/0004-637X/715/2/1152.
• de Vaucouleurs, G.; Caulet, A. (August 1982). "Velocity fields in late-type galaxies from Hα Fabry-Perot interferometry. III. The spiral galaxy NGC 6503". Astrophysical Journal Supplement Series. 49: 515–529. Bibcode:1982ApJS...49..515D. doi:10.1086/190809.
• Shostak, G. S.; et al. (March 1981). "An H I synthesis study of the galaxy/QSO pair NGC 6503/1749+70.1". Astronomy and Astrophysics. 96: 393–400. Bibcode:1981A&A....96..393S.
• Burbidge, E. Margaret; et al. (February 1964). "The Rotation and Mass of NGC 6503". Astrophysical Journal. 139: 539. Bibcode:1964ApJ...139..539B. doi:10.1086/147782.

External links

• At the Edge of the Abyss – ESA/Hubble Picture of the week.
• Frommert, Hartmut. "NGC 6503". The Interactive NGC Catalog Online. Students for the Exploration and Development of Space. Retrieved 2010-11-29.
• "Lonely Galaxy 'Lost in Space'". NASA.gov. NASA. June 10, 2015. Retrieved 2024-08-01.

v t e Constellation of Draco
List of stars in Draco Draco in Chinese astronomy
Stars	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 ψ (Dziban) ψ 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 TW AG BY CL CM CX DO V581 HR 3751 4126 4934 5811 6237 6618 (Alruba) 6817 7137 7783 HD 101364 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 LP 71-82 Qatar-1 Struve 2398 TOI-1136 WISE 1647+5632
Exoplanets Orbitar HD 139357 b HD 167042 b Hypatia Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i TOI-1452 b TrES-2b
Star clusters LAMOST 1
Nebulae Abell 50 Cat's Eye Nebula
Galaxies	NGC 3147 4121 4125 4236 4319 4345 4513 4589 5678 5777 5866 5866B 5879 5906 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 356 3C 371 3C 390.3 3C 401 4C +72.26 GB 1508+5714 H1821+643 HFLS3 KKR 25 Markarian 876 PGC 39058 S5 1803+784 S5 2007+777 UGC 9391
Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster
Astronomical events Swift J1644+57 SN 2005B SN 2016aps
Category

• Draco (constellation)
• Dwarf spiral galaxies
• Field galaxies
• Seyfert galaxies
• NGC objects