Masses and orbital inclinations of planets in the PSR B1257+12 System

Maciej Konacki, Alex Wolszczan

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


We present measurements of the true masses and orbital inclinations of the two Earth-mass planets in the PSR B1257+12 system, based on the analysis of their mutual gravitational perturbations detectable as microsecond variations of the arrival times of radio pulses from the pulsar. The 6.2 ms pulsar, PSR B1257+12, has been regularly timed with the Arecibo telescope since late 1990. Assuming the standard pulsar mass of 1.4 M, the derived masses of planets B and C are 4.3 ± 0.2 and 3.9 ± 0.2 M , respectively. The corresponding orbital inclinations of 53° ± 4° and 47° ± 3° (or 127° and 133°) imply that the two orbits are almost coplanar. This result, together with the known near 3 : 2 resonance between the orbits of the two planets, strongly supports the hypothesis of a disk origin of the PSR B1257+12 planetary system. The system's long-term stability is guaranteed by the low Earth-like masses of planets B and C.

Original languageEnglish (US)
Pages (from-to)L147-L150
JournalAstrophysical Journal
Issue number2 II
StatePublished - Jul 10 2003

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Masses and orbital inclinations of planets in the PSR B1257+12 System'. Together they form a unique fingerprint.

Cite this