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Pictor

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Pictor

Pictor
Constellation
Pictor
Abbreviation Pic
Genitive Pictoris
Pronunciation ,
genitive
Symbolism Easel
Right ascension 4.53 h ~ 6.85
Declination −43° ~ −64
Family La Caille
Quadrant SQ1
Area 247 sq. deg. (59th)
Main stars 3
Bayer/Flamsteed
stars
15
Stars with planets 6
Stars brighter than 3.00m none
Stars within 10.00 pc (32.62 ly) 1
Brightest star α Pic (3.30m)
Nearest star Kapteyn's Star
(12.77 ly, 3.92 pc)
Messier objects none
Meteor showers none
Bordering
constellations
Caelum
Carina
Columba
Dorado
Puppis
Volans
Visible at latitudes between +26° and −90°.
Best visible at 21:00 (9 p.m.) during the month of January.

Pictor is a small faint constellation in the Southern Celestial Hemisphere, located between the brilliant star Canopus and the Large Magellanic Cloud. Latin for painter, its name is an abbreviation of the older name Equuleus Pictoris (the "painter's easel"). Normally represented as an easel, Pictor was invented and named by Abbé Nicolas Louis de Lacaille in the 18th century. The constellation's brightest star is Alpha Pictoris, a white main sequence star of apparent (visual) magnitude 3.3 around 97 light-years away from Earth. Pictor also hosts RR Pictoris, a cataclysmic variable star system that flared up as a nova, reaching magnitude 1.2 in 1925 before fading into obscurity.[1]

Pictor has attracted attention because of its second-brightest star Beta Pictoris, 63.4 light-years distant from Earth, which is surrounded by an unusual dust disk rich in carbon, as well as an exoplanet (extrasolar planet). Another five stars in the constellation have been found to have planets. Among them is HD 40307, an orange dwarf that has six planets orbiting it, one of which—HD 40307 g—is a potential super-Earth in the circumstellar habitable zone. Kapteyn's Star, the nearest star in Pictor to Earth, is a red dwarf located 12.76 light-years away that was found to have two super-Earths in orbit in 2014. Pictor A is a radio galaxy that is shooting an 800,000 light-year long jet of plasma from a supermassive black hole at its centre. In 2006, a gamma ray burstGRB 060729—was observed in Pictor, its extremely long X-ray afterglow detectable for nearly two years afterwards.

Contents

  • History 1
  • Characteristics 2
  • Notable features 3
    • Stars 3.1
    • Deep-sky objects 3.2
  • Notes 4
  • References 5

History

Early depiction c.1756, when known as le Chevalet et la Palette; Canopus of Carina (the keel, or the hull, of the ship) seen at upper right

The French astronomer Abbé Nicolas Louis de Lacaille first described Pictor as le Chevalet et la Palette (the easel and palette) in 1756,[1] after observing and cataloguing 10,000 southern stars during a two-year stay at the Cape of Good Hope.[2] He devised 14 new constellations in uncharted regions of the Southern Celestial Hemisphere not visible from Europe. All but one honored instruments that symbolised the Age of Enlightenment.[3] He gave these constellations Bayer designations, including ten stars in Pictor now named Alpha to Nu Pictoris.[3] He labelled the constellation Equuleus Pictorius on his 1763 chart,[4] the word "Equuleus" meaning ass, small horse, or easel—perhaps from an old custom among artists of carrying a canvas on a donkey.[5] The German astronomer Johann Bode called it Pluteum Pictoris. The name was shortened to its current form in 1845 by the English astronomer Francis Baily on the suggestion of his countryman Sir John Herschel.[1]

Characteristics

Pictor is a small constellation bordered by Columba to the north, Puppis and Carina to the east, Caelum to the northwest, Dorado to the southwest and Volans to the south. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Pic".[6] The official constellation boundaries, as set by Eugène Delporte in 1930, are defined by a polygon of 18 segments (illustrated in infobox). In the equatorial coordinate system, the right ascension coordinates of these borders lie between 04h 32.5m and 06h 52.0m, while the declination coordinates are between −42.79° and −64.15°.[7] Pictor culminates each year at 9 p.m. on 17 March.[8] Its position in the far Southern Celestial Hemisphere means that the whole constellation is visible to observers south of latitude 26°N,[9][4] and parts become circumpolar south of latitude 35°S.[10]

Notable features

Stars

A photograph showing constellation Pictor as it can be seen by the naked eye (lines have been added that join up its three main stars). The bright star seen near Pictor is Canopus.

Pictor is a faint constellation; its three brightest stars can be seen near the prominent Canopus.[11] Within the constellation's borders, there are 49 stars brighter than or equal to apparent magnitude 6.5.[5][9] Located about 97 light-years away from Earth, Alpha Pictoris is the brightest star in the constellation; it is a white main sequence star with an apparent magnitude of 3.3,[13] and spectral type A8VnkA6.[6][15] A rapidly spinning star with a projected rotational velocity estimated at 206 km/s,[14] it has a shell of circumstellar gas.[16] Beta Pictoris is another white main sequence star of spectral type A6V and apparent magnitude 3.86. Located around 63.4 light-years distant from Earth,[17] it is a member of the Beta Pictoris moving group—a group of 17 star systems around 12 million years old moving through space together.[18] In 1984 Beta Pictoris was the first star discovered to have a debris disk.[19] Since then, an exoplanet about eight times the mass of Jupiter has been discovered orbiting approximately 8 astronomical units (AU) away from the star—a similar distance as that between our Sun and Saturn. The European Southern Observatory (ESO) confirmed its presence through the use of direct imagery with the Very Large Telescope in late 2009.[20]

Gamma Pictoris is an orange giant of spectral type K1III that has swollen to 1.4 times the diameter of the Sun.[21] Shining with an apparent magnitude of 4.5, it lies 174 light-years distant from Earth.[22] HD 42540, called 47 Pictoris by American astronomer Benjamin Apthorp Gould, is a slightly cooler orange giant, with a spectral type of K2.5III and average magnitude 5.04.[23] It has also been suspected of being a variable star.[24] Lacaille mistakenly named this star Mu Doradus, but had recorded its Right Ascension one hour too low.[25] Lacaille named two neighbouring stars Eta Pictoris.[4][7] Eta2 Pictoris, also known as HR 1663, is an orange giant of spectral type K5III and apparent magnitude 5.05. 474 light-years distant,[27] it has a diameter 5.6 times that of the Sun.[21] Eta1 Pictoris, also known as HR 1649, is 85 light-years distant and is a main sequence star of spectral type F5V and visual magnitude 5.38.[28] A double star, it has a companion of magnitude 13; the two are separated by 11 arcseconds.[29]

Beta Pictoris Comparison.[30]

Located about 1298 light-years from Earth, Delta Pictoris is an eclipsing binary of the Beta Lyrae type.[31] Composed of two blue stars of spectral types B3III and O9V, the system has a period of 1.67 days, and is observed to dip from apparent magnitude 4.65 to 4.9.[32] The stars are oval-shaped as they are gravitationally distorted by each other.[33] TV Pictoris is a spectroscopic binary system composed of an A-type star and an F-type star which rotate around each other in a very close orbit. The latter star is elliptical in shape and itself varies in brightness.[34] The visual magnitude ranges between 7.37 and 7.53 every 20 hours.[35]

Aside from Beta, five other stars in Pictor are known to host planetary systems. AB Pictoris is a BY Draconis variable star with a substellar companion that is either a large planet or a brown dwarf, which was discovered by direct imaging in 2005.[36] HD 40307 is an orange main sequence star of spectral type K2.5V and apparent magnitude 7.17 located about 42 light-years away. Doppler spectroscopy with the High Accuracy Radial Velocity Planet Searcher (HARPS) indicates that HD 40307 is host to six super-Earth planets, one of which, HD 40307 g, lies in the circumstellar habitable zone of the star, and is not close enough to be tidally locked (i.e. with the same face always facing the star), unlike the other planets in the same system, and many other planets which orbit close to their parent stars.[37] HD 41004 is a complex binary system about 139 light-years distant. The primary is an orange dwarf of spectral type K1V orbited by a planet roughly 2.65 times the mass of Jupiter every 963 days, while the secondary is a red dwarf of spectral type M2V and orbited by a brown dwarf that is at least 19 times as massive as Jupiter. Both substellar components were discovered by doppler spectroscopy using the CORALIE spectrograph in 2004 and 2002 respectively.[38] Kapteyn's Star, a nearby red dwarf at the distance of 12.78 light-years, has a magnitude of 8.8. It has the largest proper motion of any star in the sky after Barnard's Star.[39] Moving around the Milky Way in the opposite direction to most other stars, it may have originated in a dwarf galaxy that was merged into the Milky Way, with the main remnant being the Omega Centauri globular cluster.[40] In 2014 analysis of the doppler variations of Kapteyn's Star with the HARPS spectrograph showed that it hosts two super-Earths—Kapteyn b and Kapteyn c. Kapteyn b is the oldest-known potentially habitable planet, estimated to be possibly 11 billion years old.[41]

Located 1.5 degrees west southwest of Alpha, RR Pictoris is a cataclysmic variable that flared up as a nova, reaching magnitude 1.2 on 9 June 1925.[39] Six months after its peak brightness, it had faded to be invisible to the unaided eye, and was magnitude 12.5 by 1975.[42] RR Pictoris is a close binary system composed of a white dwarf and secondary star that orbit each other every 3.48 hours—so close that the secondary is filling up its Roche lobe with stellar material, which is then transferred onto the first star's accretion disk. Once this material reaches a critical mass, it ignites and the system brightens tremendously. Calculations from the orbital speed suggest the secondary star is not dense enough for its size to still be on the main sequence, so it also must have begun expanding and cooling already after its core ran out of hydrogen fuel.[43] The RR Pictoris system is estimated to lie around 1300 light-years distant from Earth.[44]

Deep-sky objects

An image from Chandra X-ray Observatory showing a jet of plasma emanating from Pictor A

NGC 1705 is an irregular dwarf galaxy 17 million light-years from Earth. It is one of the most active star forming galaxies in the nearby universe, despite the fact that its rate of star formation peaked around 30 million years ago.[45] Pictor A, around 485 million light-years away, is a double-lobed radio galaxy[46] and a powerful source of radio waves in the Southern Celestial Hemisphere.[47] From a supermassive black hole at its centre, a relativistic jet shoots out to an X-ray hot spot 800,000 light years away.[48] SPT-CL J0546-5345 is a massive galaxy cluster located around 7 billion light-years away with a mass equivalent to approximately 800 trillion suns.[49]

GRB 060729 was a gamma-ray burst that was first observed on 29 July 2006. It is likely the signal of a type Ic supernova—the core collapse of a massive star.[50] It was also notable for its extraordinarily long X-ray afterglow, detectable 642 days (nearly two years) after the original event.[51] The event was remote, with a redshift of 0.54.[50]

Notes

  1. ^ Deneb, the 19th-brightest star in the night sky, has a magnitude of 1.25.
  2. ^ His observatory was in a private house on the shores of Table Bay in Cape Town.[2]
  3. ^ He erred in naming the wrong star with the Greek letter epsilon, which is now not used.[4]
  4. ^ While parts of the constellation technically rise above the horizon to observers between 26°N and 47°N, stars within a few degrees of the horizon are to all intents and purposes unobservable.[9]
  5. ^ Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies[12]
  6. ^ The kA6 notation indicates a weaker than normal K-lines in the spectrum. The 'n' following the main sequence luminosity class of V indicates the absorption lines in the spectrum are broad and nebulous, due to the rapid spin of the star.[14]
  7. ^ Like Bayer, Lacaille would simply give two stars very close to each other the same designation with no modifier. It was left to later astronomers such as Gould to designate Eta1, Eta2 etc.[26]

References

Citations
  1. ^ a b PictorStar TalesRidpath, .
  2. ^ Warner 2002.
  3. ^ Wagman 2003, pp. 6–7.
  4. ^ a b c Wagman 2003, p. 246.
  5. ^ Chartrand 1982, p. 176.
  6. ^ Russell 1922, p. 469.
  7. ^ , PictorThe ConstellationsIAU, .
  8. ^ The Constellations : Part 2 Culmination Times.
  9. ^ a b c Ridpath, Constellations: Lacerta–Vulpecula.
  10. ^ Heifetz & Tirion 2007, p. 106.
  11. ^ 2000StargazingMoore, , p. 118.
  12. ^ The Bortle Dark-Sky Scale.
  13. ^ SIMBAD Alpha Pictoris.
  14. ^ a b Royer 2007.
  15. ^ Gray 2006.
  16. ^ Hempel 2003.
  17. ^ SIMBAD Beta Pictoris.
  18. ^ Zuckerman 2001.
  19. ^ Smith & Terrile 1984.
  20. ^ Lagrange 2010; ESO 2010.
  21. ^ a b Pasinetti-Fracassini et al. 2001.
  22. ^ SIMBAD Gamma Pictoris.
  23. ^ SIMBAD HR 2196.
  24. ^ AAVSO HR 2196.
  25. ^ Harvard College Observatory 1883.
  26. ^ Wagman 2003, p. 7.
  27. ^ SIMBAD HR 1663.
  28. ^ SIMBAD HR 1649.
  29. ^ SIMBAD CD-49 1541B.
  30. ^ "Beta Pictoris – Comparison". ESA/Hubble. Retrieved 26 February 2015. 
  31. ^ SIMBAD Delta Pictoris.
  32. ^ Malkov & Oblak 2006.
  33. ^ Cousins 1966.
  34. ^ Pavlovski et al. 1998.
  35. ^ AAVSO TV Pictoris.
  36. ^ Chauvin 2005.
  37. ^ Tuomi 2013.
  38. ^ Zucker 2004.
  39. ^ a b Motz & Nathanson 1988, pp. 374–75.
  40. ^ Kotoneva et al. 2005.
  41. ^ Anglada-Escudé 2014.
  42. ^ Burham 2013, p. 1460–62.
  43. ^ Ribeiro 2006.
  44. ^ Duerbeck 1981.
  45. ^ Wilkins & Dunn 2006.
  46. ^ NED Pictor A.
  47. ^ Perley et al. 1997.
  48. ^ ChandraPR.
  49. ^ Ghosts of the Future.
  50. ^ a b Cano et al. 2011.
  51. ^ Grupe et al. 2010.

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