| Palomar 12 | |
| Observation data (J2000 epoch) | |
|---|---|
| Class | XII |
| Constellation | Capricornus |
| Right ascension | 21h 46m 38. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for Globular clusters according to their concentration In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Capricornus ( Latin for "horned (male Goat " or "goat horn " is one of the Constellations of the Zodiac. Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 8s[1] |
| Declination | −21° 15′ 03″[1] |
| Distance | 64 ± 3 kly (19. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 5 ± 0. 9 kpc[2]) |
| Apparent magnitude (V) | 11. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 99 |
| Apparent dimensions (V) | 17′. 4 |
| Physical characteristics | |
| Mass | - kg (- M ) |
| Radius | 162 ± 8 ly[3] |
| VHB | - |
| Estimated age | 6. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. 5 Gyr[4] |
| Notable features | - |
| Other designations | GCl 123[1] |
| See also: Globular cluster, List of globular clusters | |
Palomar 12 is a globular cluster in the constellation Capricornus that belongs to the halo of the Milky Way galaxy. A globular cluster is a spherical collection of Stars that orbits a galactic core as a Satellite. This is a list of Globular clusters. The apparentmagnitude does not include an extinction correction A globular cluster is a spherical collection of Stars that orbits a galactic core as a Satellite. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Capricornus ( Latin for "horned (male Goat " or "goat horn " is one of the Constellations of the Zodiac. The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Γαλαξίας (Galaxias sometimes referred to simply First discovered on the Palomar Survey Sky plates by Robert G. Harrington and Fritz Zwicky,[5] it was catalogued as a globular cluster. Robert G Harrington was an American Astronomer who worked at Palomar Observatory. Fritz Zwicky ( February 14 1898 &ndash February 8 1974) was an American-based Swiss Astronomer of Bulgarian origin However Zwicky came to believe this was actually a nearby dwarf galaxy in the Local Group. The Local Group is the group of galaxies that includes our galaxy the Milky Way. It is a relatively young cluster, being about 30% younger than most of the globular clusters in the Milky Way. [2] It is metal-rich with a metallicity of [Fe/H] ~= -0. In Astronomy and Physical cosmology, the metallicity of an object is the proportion of its matter made up of Chemical elements other than Hydrogen 8. [4] It has an average luminosity distribution of Mv = -4. 48. [6]
Based on proper motion studies, this cluster was first suspected in 2000 to have been captured from the Sagittarius dwarf galaxy about 1. The proper motion of a Star is the measurement of its change in position in the sky over time after Improper motions are accounted for The Sagittarius Dwarf Elliptical Galaxy ( SagDEG) is an elliptically looped shaped Satellite galaxy of the Milky Way Galaxy. 7 Gyr ago. [7] Its membership is now generally believed (Cohen 2004, Sbordone et al. 2006). [4]
References
- ^ a b c SIMBAD Astronomical Database. Results for Palomar 12. Retrieved on 2006-11-16. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 534 - A second and final revision of the Codex Justinianus is published
- ^ a b A. Rosenberg, I. Saviane, G. Piotto, E. V. Held (1998). "Young Galactic globular clusters II. The case of Palomar 12". Astronomy and Astrophysics 339: 61–69.
- ^ distance × sin( diameter_angle / 2 ) = 162 ly. radius
- ^ a b c Geisler, Doug; Wallerstein, George; Smith, Verne V. & Casetti-Dinescu, Dana I. (September 2007), “Chemical Abundances and Kinematics in Globular Clusters and Local Group Dwarf Galaxies and Their Implications for Formation Theories of the Galactic Halo”, The Publications of the Astronomical Society of the Pacific 119 (859): 939-961, <http://adsabs.harvard.edu/abs/2007PASP..119..939G>
- ^ Abell, George O. (1955). "Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey". Publications of the Astronomical Society of the Pacific 67 (397): 258. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ van den Bergh, Sidney (July 2007), “The Luminosity Distribution of Globular Clusters in Dwarf Galaxies”, The Astronomical Journal 134 (1): 344-345, <http://adsabs.harvard.edu/abs/2007AJ....134..344V>
- ^ D. Sidney van den Bergh (born 20 May 1929, Wassenaar) is a Canadian astronomer I. Dinescu, S. R. Majewski, T. M. Girard, K. M. Cudworth (2000). "The Absolute Proper Motion of Palomar 12: A Case for Tidal Capture from the Sagittarius Dwarf Spheroidal Galaxy". The Astronomical Journal 120 (4): 1892–1905. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
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