169P/NEAT

For other comets discovered by the Near-Earth Asteroid Tracking survey, see Comet NEAT (disambiguation).

169/NEAT is a periodic comet in the Solar System. It is the parent body of the alpha Capricornids meteor shower in late July. 169/NEAT may be related to comet P/2003 T12 (SOHO).^[4][5]

169P/NEAT

Discovery
Discovered by	NEAT
Discovery date	March 15, 2002
Designations
Alternative designations	P/2002 EX12
Orbital characteristics[1][2]
Epoch	2022-08-09 (2459800.5)
Aphelion	4.6014 AU
Perihelion	0.60282 AU
Semi-major axis	2.6021 AU
Eccentricity	0.76833
Orbital period	4.1975 yr
Inclination	11.2985°
Last perihelion	9 July 2022
Physical characteristics[3]
Mean radius	2.5 km (1.6 mi)
Synodic rotation period	8.4 hours

Physical characteristics

169P is a low activity comet roughly about 5.0 km (3.1 mi) in diameter,^[3][6] with a rotation period lasting about 8.4 hours.^[3] It could have originated from the main asteroid belt.^[5]

Orbit

It last came to perihelion (closest approach to the Sun) on 9 July 2022.^[2] On 13 July 2022 passed 0.1395 AU (20.87 million km) from Venus.^[1] On 11 August 2026, it will pass 0.1672 AU (25.01 million km) from Earth and then come to perihelion on 21 September 2026.

169P has a similar stable orbit with the smaller body P/2003 T₁₂ (SOHO), both avoiding close encounters with Jupiter. It is possible that both comets likely fragmented from a parent body a bit over 2,000 years ago.^[5][6] A further fragmentation even about 4,500 to 5,000 years ago could have produced the meteors of the alpha Capricornids meteor shower. The total estimated mass of the meteors is similar to that of the surviving comet.^[7]