123P/Orbital period

measurement only allows for an estimate on the exoplanet's orbital parameters, but not on their orbital inclination (i). As such, most exoplanets only have an

Planet Center after having been observed on at least two occasions. Their orbital periods vary from 3.2 to 366 years. As of October 2023[update] there are

periodic comet with an orbital period of 74 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). It was

western Finland". Tectonophysics. 216 (1–2): 123–142. Bibcode:1992Tectp.216..123P. doi:10.1016/0040-1951(92)90160-8. Retrieved 2023-06-02. Vuoden 1997 tulosraportointi

Astronomy & Astrophysics. 624: 19. arXiv:1903.04808. Bibcode:2019A&A...624A.123P. doi:10.1051/0004-6361/201935192. ISSN 0004-6361. S2CID 85497416. A123. Jenkins