What are the chances a comet will hit Earth?

Currently none are predicted (the single highest probability impact currently listed is ~7 m asteroid 2010 RF12, which is due to pass earth in September 2095 with only a 5\% predicted chance of impacting). Currently prediction is mainly based on cataloging asteroids years before they are due to impact.

What is the fastest comet ever recorded?

Comet Encke

Discovery
Max. orbital speed	69.9 km/s (252,000 km/h)
Inclination	11.76°
TJupiter	3.026
Earth MOID	0.17 AU (25 million km)

Is there an 18th magnitude comet on the PCCP?

[MPEC 2014-M10, CBET 3906, 2014 June 18]. In 2021 January it briefly appeared on the PCCP as C4PEAU2. Brian Skiff discovered an 18th magnitude comet on LONEOS images taken with the 0.59-m Schmidt on November 4.08.

Is there a 21st magnitude comet in the sky?

A 21st magnitude comet discovered in PanSTARRS 1 images taken with the 1.8m Ritchey-Chretien on April 29.36, was linked to asteroid 2007 RJ236 discovered during the Mt Lemmon survey on 2007 September 13.30. It was also linked to observations made by the Purple Mountain Observatory in 2007 August.

What is the best Comet scoring system?

Comet Assay IV TM is the latest in a highly successful series of comet scoring systems originally developed by Perceptive Instruments, now a part of Instem. Comet Assay IV is the professional choice for those seeking accuracy, reproducibility and GLP compliance.

What was the 19th magnitude comet discovered in 2003?

[CBET 3918, MPEC 2014-N43, 2014 July 7] A 19th magnitude comet was discovered by LINEAR on 2003 July 30.39, although other CCD observers estimated it at 18th magnitude. It was confirmed as cometary by Peter Birtwhistle amongst others. The comet reached perihelion at 1.25 au in mid August.