64PSwift-Gehrels

This comet was discovered on 1889 Nov. 17 by L. Swift from Warner Observatory (Rochester, USA) while searching for nebulae. He described the comet as "pretty faint, large, little elongated". It was observed until 1890 Jan. 22. From all the observations it was computed an elliptical orbit with a period of 8.9 +/- 0.9 years.
On 1973 Feb. 8 Tom Gehrels (Palomar Observatory, USA) discovered a comet of mag. 19 on a plate exposed with the 122-cm Schmidt telescope. He described the comet as diffuse with a sharp condensation, but no tail. After less than a month of observations, Brian marsden of the Minor Planet Center noted the orbit similarity with the comet that Swift discovered in 1889. For some reasons, it was unobserved for the previous 8 apparitions! Its current period is 9.34 years.

222P/LINEAR

This object was discovered by the LINEAR team on 2004 Dec. 7 with their 1.0-m reflecting telescope + CCD with nuclear magnitude around 19. It was confirmed on Dec. 9 by Eric J. Christensen with the 0.68-m Schmidt of Catalina Sky Survey with total magnitude around 16.5 and a faint 20" tail in PA 60°.
Brian Marsden of the Minor Planet Center designated it C/2004 X1 (LINEAR) on MPEC 2004-X31 and IAUC 8449.
With addistional astrometry, a short period orbit was determined, with a period of 5.15 years. It was last detected on 2005 January 11 by S. Gajdos (118 - Modra).
On 2009 Jun. 29 Robert H. McNaught discovered an asteroidal object of mag around 18 on images taken with the 0.5-m Uppsala Schmidt telescope on the course of Siding Spring Survey (E12). After some time, its orbit was connected with comet P/2004 X1 (LINEAR) and thus redesignated P/2009 MB9. With two oppositions, the comet received the definitive designation 222P/LINEAR (IAUC 9062 - Subscription required). Its period is 4.83 years.