PSR J1719-1438

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PSR J1719-1438

Observation data
Epoch MJD 55411.0[1]      Equinox J2000
Constellation Serpens
Right ascension 17:19:10.0730(1)[1]
Declination −14:38:00.96(2)[1]
Spectral type millisecond pulsar[1]
Apparent magnitude (R) >25.4[1]
Apparent magnitude (g) >24.1[1]
Apparent magnitude (I) >22.5[1]
Distance ~1,200[1] pc
Primary PSR J1719-1438
Companion PSR J1719-1438b
Period (P) 0.090706293(2) days
Semi-major axis (a) a_P\sin i=0.001819(1) light seconds
Eccentricity (e) <0.06
Periastron epoch (T) MJD 55411.0
Other designations
Database references

PSR J1719-1438 is a millisecond pulsar with a spin period of 5.8 ms located about 4000 ly from Earth in the direction of Serpens Cauda,[1][2] one minute from the border with Ophiuchus. Millisecond pulsars are generally thought to begin as normal pulsars and then spin up by accreting matter from a binary companion.

Diamond planet[edit]

Main article: PSR J1719-1438 b

PSR J1719-1438 was discovered in 2011 by the High Time Resolution Survey, a radio astronomy search for astronomical objects that rapidly vary in radio brightness, such as pulsars.[1] Timing measurements using the Parkes Telescope and Lovell Telescope showed that it has a low-mass companion: PSR J1719-1438 b.[1] The companion has a mass similar to that of Jupiter, but 40% of the diameter. It orbits the pulsar with a period of 2 hours 10 minutes and 37 seconds, at a distance of around 600,000 km (0.89 solar radii).[1] The companion is likely the remnant of a star whose outer layers were siphoned off by the more massive pulsar. Calculations show the companion has a minimum density of 23 grams per cubic centimeter and is probably an ultra-low-mass carbon–oxygen white dwarf.[1]

Because the companion to PSR J1719-1438 is planet-sized, made primarily of carbon (with an unknown amount of oxygen), and very dense, it may be similar to a large diamond. In the science press, the object has been called the "Diamond Planet".[2][3][4]

See also[edit]

  • EF Eridani, a star system with a compact star and a degraded planetary-mass former star


  1. ^ a b c d e f g h i j k l m n Bailes, M.; Bates, S. D.; Bhalerao, V.; Bhat, N. D. R.; Burgay, M.; Burke-Spolaor, S.; d'Amico, N.; Johnston, S. et al. (2011). "Transformation of a Star into a Planet in a Millisecond Pulsar Binary". Science 333 (6050): 1717–20. arXiv:1108.5201. Bibcode:2011Sci...333.1717B. doi:10.1126/science.1208890. PMID 21868629. 
  2. ^ a b "Star Transforms Into A Diamond Planet". Universe Today. Retrieved 2011-08-26. 
  3. ^ "Surprise! Alien Planet Made of Diamond Discovered". Retrieved 2011-08-25. 
  4. ^ "A Planet made of Diamond". Max Planck Institut for Radio Astronomy. Retrieved 2011-08-26.