1999 XS35

1999 XS₃₅ is a near-Earth object discovered in 1999 having a comet-like orbit. Its semi-major axis is 17.8 AU. Its orbital eccentricity is 0.94, which means that at the perihelion 1999 XS₃₅ comes as close as 0.9 AU to the Sun, while at the aphelion it reaches beyond the orbit of Neptune.^[2] 1999 XS₃₅ is a damocloid. 1999 XS₃₅ is a small object with an absolute magnitude (H) of 17.2, which implies a size of about 1 km.^[4]

1999 XS₃₅

The comet-like orbit of 1999 XS35
Discovery[1]
Discovered by	LONEOS
Discovery date	2 December 1999
Designations
MPC designation	1999 XS35
Minor planet category	PHA Apollo[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 4
Aphelion	34.711 AU (5.1927 Tm) (beyond Neptune)
Perihelion	0.95932 AU (143.512 Gm)
Semi-major axis	17.835 AU (2.6681 Tm)
Eccentricity	0.94621
Orbital period (sidereal)	75.32 yr (27512 d)
Mean anomaly	77.641°
Mean motion	0° 0m 47.106s /day (n)
Inclination	19.414°
Longitude of ascending node	49.206°
Argument of perihelion	333.00°
Earth MOID	0.0181452 AU (2.71448 Gm)
TJupiter	1.407
Physical characteristics
Mean diameter	1.3 km (est. at 0.14)[3]
Apparent magnitude	13.7 to 32
Absolute magnitude (H)	17.2[2]

1999 XS₃₅ came to perihelion on 21 October 1999,^[2] passed 0.0453 AU (6,780,000 km; 4,210,000 mi) from Earth on 5 November 1999,^[5] and was discovered on 2 December 1999 at about apparent magnitude 16.9.^[1]