30P/Reinmuth 1 was discovered by Karl Reinmuth at
The comet is of short period. Initially the period was 7.23 years and the perihelion distance 1.86AU, but a fairly close approach to Jupiter in 1937 changed the orbit and moved it to a slightly longer period (a maximum of 7.69 years) and a more distant perihelion (2.04AU), making it much fainter, such that it could no longer get brighter than magnitude 17. Since then the comet has progressively moved back to its earlier orbit and currently has a period of 7.32 years and perihelion at 1.87AU.
The 2002 apparition
30P/Reinmuth will pass perihelion on December 24th and will peak at around magnitude 14.5. Like many old, evolved comets it brightens rather rapidly as it approaches the Sun. This is due to the mantle of dust that has built up over the nucleus that prevents the Sun's heat reaching the ices until sufficient heat has leaked through. The comet will thus increase in brightness very rapidly through November and December. This is a much better return than 1995 when the comet never brightened more than to magnitude 16.5.
Maximum brightness was reached approximately 2 months after perihelion. As caan be appreciated from the CCD total magnitude estimates, the comet reached about magnitude 13 at maximum.
CCD observations in a 10 arcsecond aperture by:
CCD aperture photometry in apertures of 0'.3, 0'.5, 1'.0, 2'.2 by: