| 词条 | NGC 2509 |
| 释义 |
| name = NGC 2509 | image = File:NGC 2509 DSS.jpg | caption = | credit = | epoch = J2000 | constellation = Puppis | ra = {{RA|08|00|48}}[1] | dec = {{DEC|-19|03|06}}[1] | dist_ly = 9,500 ly | dist_pc = 2,900 pc[1] | appmag_v = 9.3[2] | size_v = 2.5 ± 0.5′ | age = 1,200 Myr[1] | notes = | names = NGC 2509, Melotte 81, OCl 630[2] }}NGC 2509 is an open cluster in the constellation of Puppis. It was discovered on 3 December 1783 by William Herschel.[3] It was described as "bright, pretty rich, slightly compressed" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[3] The cluster is about 14 light-years (4.2 parsecs) wide,[1] but the cluster's other parameters remain poorly known. Some studies have estimated a distance of about 9,500 light-years (2,900 parsecs) away from the Solar System,[1] while older estimates put it at only 2980 light-years (912 parsecs) away.[4] Estimates of the cluster's age have also varied significantly, from 1.2 billion years old[1] to 8 billion years old.[4] The latest analysis based on the parallaxes measured by the Gaia spacecraft confirms that it is a relatively distant object, with a distance between 2500 and 3000 parsecs[5]. References1. ^1 2 3 4 5 6 {{cite journal|bibcode=2007A&A...464..573C|doi=10.1051/0004-6361:20066350|arxiv=astro-ph/0611705|title=Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen 4|journal=Astronomy & Astrophysics|volume=464|issue=2|pages=573|year=2007|last1=Carraro|first1=G.|last2=Costa|first2=E.}} {{Ngc30|state=collapsed}}{{star-cluster-stub}}2. ^1 {{cite simbad|title=NGC 2509|accessdate=9 August 2017}} 3. ^1 {{cite web|title=New General Catalog Objects: NGC 2500 - 2549|url=http://cseligman.com/text/atlas/ngc25.htm#2509|website=cseligman.com|accessdate=9 August 2017}} 4. ^1 {{cite journal|title=Study of open cluster NGC 2509|author1=Sujatha, S.|author2=Babu, G. S. D.|journal=Bulletin of the Astronomical Society of India|volume=31|pages=9–18|date=2003|bibcode=2003BASI...31....9S}} 5. ^{{ Cite journal | last = Cantat-Gaudin | first = T. | last2 = Jordi | first2 = C. | last3 = Vallenari | first3 = A. | display-authors = et al | date = 2018 | title = A Gaia DR2 view of the open cluster population in the Milky Way | doi = 10.1051/0004-6361/201833476 | bibcode=2018A&A...618A..93C | arxiv=1805.08726 | journal=Astronomy & Astrophysics|volume=618|year=2018}} 3 : Open clusters|Puppis|NGC objects |
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