Peter Jalowiczor (born 1965) is an independent scholar (astronomer) living in South Yorkshire, in the United Kingdom.

Jalowiczor is primarily known for co-discovering four exoplanets at home using data released to the public by the University of California's Lick-Carnegie Planet Search Team[1][2] and conducted research confirming that

[4] At the University of Sheffield, he did his postgraduate research under Professor David Hughes studying Halley's Comet, which was his work on the delta effect.

Jalowiczor has taken part in several research projects as an independent scholar, including work with exoplanets, brown dwarfs, comets and Mars.

[7] NASA launched their Backyard Worlds: Planet 9 Citizen Science Project in early 2017, under Dr Marc Kuchner.

[8] These are also generally mentioned in Marc's Blog post and are expected to be published in a future science journal.

[12] The University of California launched the Lick–Carnegie Exoplanet Survey, a search for exo-planets with the method of Doppler spectroscopy, using the ten-meter Keck telescope located in Hawaii.

[2] Jalowiczor looked for oscillations of stars that could be caused by a nearby planet, alerting the University of California to possible exoplanets.

[14][3] He sent around 40 suggestions before the survey team contacted Jalowiczor indicating that they believed he found a potential exoplanet.

[19] Jalowiczor's work towards the discovery of exoplanets has been published in the Astrophysical Journal in a paper titled The Lick-Carnegie Survey: Four New Exoplanet Candidates written with Stefano Meschiari, Gregory P. Laughlin, Steven S. Vogt, R. Paul Butler, Eugenio J. Rivera, and Nader Haghighipour.

[20] Jalowiczor has also published in the journal Monthly Notices of the Royal Astronomical Society in 1993, in a paper titled On the variation of cometary coma brightness with comet-Earth distance (the Delta Effect), authored with David Hughes, Neil McBride, and James Boswell, a research team led by David Hughes at the University of Sheffield.

[9][21] In December 2023, Jalowiczor was included as a co-author on a major paper Full-sky 20-pc Census of 3,600 Stars and Brown Dwarfs.

[27] Jalowiczor has been awarded three times by the Polish Football Association, or the PZPN (Polski Zwiazek Pilki Noznej), for his work.

[28] Jalowiczor is a member of Sheffield Authors and has written four books, including two about World War II and two about football.

[28] It is a collection of WWII accounts from Polish ex-servicemen who settled in Rotherham after the war and charts the development of their community in the following decades.

Most proceeds were donated to Cancer Research via the Inspiration For Life Trust Fund at the Department of Physics and Astronomy at the University of Sheffield.