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PSR B1828-11 (also known as PSR B1828-10) is a pulsar approximately 10,000 light-years away in the constellation of Scutum. The star exhibits variations in the timing and shape of its pulses: this was at one stage interpreted as due to a possible planetary system in orbit around the pulsar, though the model required an anomalously large second period derivative of the pulse times. The planetary model was later discarded in favour of precession effects as the planets could not cause the observed shape variations of the pulses. While the generally accepted model is that the pulsar is a neutron star undergoing free precession, a model has been proposed that interprets the pulsar as a quark star undergoing forced precession due to an orbiting "quark planet". The entry for the pulsar on SIMBAD lists this hypothesis as being controversial.

References

1. Smith, D. A.; Guillemot, L.; Camilo, F.; Cognard, I.; et al. (2008). "Pulsar timing for the Fermi gamma-ray space telescope". Astronomy and Astrophysics. 492 (3): 923–931. arXiv:0810.1637. Bibcode:2008A&A...492..923S. doi:10.1051/0004-6361:200810285. S2CID 119200759.
2. ^ "PSR B1828-10 -- Pulsar". SIMBAD. Retrieved 2014-07-02.
3. Bailes, M.; Lyne, A. G.; Shemar, S. L. (1993). "Limits on pulsar planetary systems from the Jodrell Bank timing database". Planets around pulsars; Proceedings of the Conference. California Inst. of Technology, Pasadena. pp. 19–30. Bibcode:1993ASPC...36...19B.
4. Stairs, I. H.; Lyne, A. G.; Shemar, S. L. (2000). "Evidence for free precession in a pulsar". Nature. 406 (6795): 484–486. Bibcode:2000Natur.406..484S. doi:10.1038/35020010. PMID 10952302. S2CID 4415709.
5. Link, Bennett; Epstein, Richard I. (2001). "Precession Interpretation of the Isolated Pulsar PSR B1828-11". The Astrophysical Journal. 556 (1): 392–398. arXiv:astro-ph/0101434. Bibcode:2001ApJ...556..392L. doi:10.1086/321581. S2CID 118948361.
6. Akgün, Taner; Link, Bennett; Wasserman, Ira (2006). "Precession of the isolated neutron star PSR B1828-11". Monthly Notices of the Royal Astronomical Society. 365 (2): 653–672. arXiv:astro-ph/0506606. Bibcode:2006MNRAS.365..653A. doi:10.1111/j.1365-2966.2005.09745.x. S2CID 14390165.
7. Liu; et al. (2007). "PSR B1828-11: a precession pulsar torqued by a quark planet?". Monthly Notices of the Royal Astronomical Society: Letters. 381 (1): L1 – L5. arXiv:astro-ph/0411133. Bibcode:2007MNRAS.381L...1L. doi:10.1111/j.1745-3933.2007.00337.x. S2CID 119405995.

v t e Constellation of Scutum
List of stars in Scutum Scutum in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η Variable R S UY V373 V452 V479 Other BD-11 4672 CoRoT-16 CoRoT-17 IRC −10414 2MASS J18450079–1409036 PSR B1828−11 PSR B1829−10 PSR J1841−0500 WR 114 WR 119 WR 120 WR 121-16 Stephenson 2 DFK 1 RSGC1-F01 RSGC1-F02 IRAS 18357-0604 Stephenson 2 DFK 49
Exoplanets BD-11 4672 b c CoRoT-16b CoRoT-17b
Star clusters	NGC 6649 6712 Other Alicante 7 Alicante 8 Alicante 10 Mercer 3 Messier 26 RSGC1 RSGC3 Stephenson 2 Wild Duck Cluster
Nebulae IC 1295
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