Astronomical objects discovered in 2013

is a near-Earth Apollo asteroid that passed 0.00508 AU (760,000 km; 472,000 mi) from Earth on 11 December 2013. It passed by Earth at about 2 lunar distances, and was discovered 5 days previously, on 7 December 2013. At 30–70 metres (98–230 feet) across it is bigger than the estimated size of the Chelyabinsk meteor impact of 2013. has been observed by radar and has a well determined orbit. It will pass about 0.0007 AU (100,000 km; 65,000 mi) from the Moon on 11 December 2095. 2013 XY8 was detected by the Catalina Sky Survey and follow up observations were conducted with the Faulkes Telescope South.

Peggy is the informal name for a former moonlet in the outermost part of Saturn's Ring A, orbiting 136,775 kilometres (84,988 mi) away from the planet. The moonlet was discovered by the Cassini Imaging Team in 2013 and it may likely be exiting Saturn's A Ring. No direct image of Peggy has ever been made. Similar moons to Peggy include Bleriot, Earhart and Santos-Dumont among others.

2013 FT28 is a trans-Neptunian object. The existence of the TNO was discovered on 16 March 2013 at Cerro Tololo Observatory, La Serena and revealed on 30 August 2016.

(provisional designation ) is a trans-Neptunian object and binary system that belongs to the scattered disc (like Eris). Its discovery was announced on 31 March 2014. It has an absolute magnitude (H) of 3.2. is a binary object, with two components approximately 740 kilometres (460 mi) and 190 kilometres (120 mi) in diameter. It is the ninth-intrinsically-brightest known trans-Neptunian system, and is approximately tied with and (to within measurement uncertainties) as the largest unnamed object in the Solar System.

(also known as) is an Atira asteroid, a type of Aten asteroid, that orbits entirely within Earth's orbit. It orbits very close to the Sun, having the eighth smallest semi-major axis of any minor planet in the Solar System. At its closest, it is only 0.26 AU (39,000,000 km; 24,000,000 mi) from the Sun, but more than 100 minor planets have a smaller perihelion distance.

311P/PanSTARRS also known as P/2013 P5 (PanSTARRS) is an active asteroid (object with asteroid-like orbit but with comet-like visual characteristics) discovered by Bryce T. Bolin using the Pan-STARRS telescope on 27 August 2013. Observations made by the Hubble Space Telescope revealed that it had six comet-like tails. The tails are suspected to be streams of material ejected by the asteroid as a result of a rubble pile asteroid spinning fast enough to remove material from it. This is similar to 331P/Gibbs, which was found to be a quickly-spinning rubble pile as well.

Hippocamp, also designated Neptune XIV, is a small moon of Neptune discovered on 1 July 2013. It was found by astronomer Mark Showalter by analyzing archived Neptune photographs the Hubble Space Telescope captured between 2004 and 2009. The moon is so dim that it was not observed when the Voyager 2 space probe flew by Neptune and its moons in 1989. It is about 35 km (20 mi) in diameter, and orbits Neptune in about 23 hours, just under one Earth day. Due to its unusually close distance to Neptune's largest inner moon Proteus, it has been hypothesized that Hippocamp may have accreted from material ejected by an impact on Proteus several billion years ago. The moon was formerly known by its provisional designation S/2004 N 1 until February 2019, when it was formally named Hippocamp, after the mythological sea-horse symbolizing Poseidon in Greek mythology.

is a trans-Neptunian object and centaur from the scattered disk and Inner Oort cloud approximately 30 kilometers in diameter.

1727 Mette, provisional designation 1965 BA, is a binary Hungaria asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 9 kilometers in diameter.

WT1190F (9U01FF6, UDA34A3, or UW8551D) was a small temporary satellite of Earth that impacted Earth on 13 November 2015 at 06:18:21.7 (± 0.1 seconds) UTC. It is thought to have been space debris from the trans-lunar injection stage of the 1998 Lunar Prospector mission. It was first discovered on 18 February 2013 by the Catalina Sky Survey. It was then lost, and reacquired on 29 November 2013. It was again discovered on 3 October 2015 by astronomer Rose Garcia with the Catalina Sky Survey 60-inch telescope, and the object was soon identified to be the same as the two objects previously sighted by the team, who have been sharing their data through the International Astronomical Union's Minor Planet Center (MPC). An early orbit calculation showed that it was orbiting Earth in an extremely elliptical orbit, taking it from within the geosynchronous satellite ring to nearly twice the distance of the Moon. It was also probably the same object as 9U01FF6, another object on a similar orbit discovered on 26 October 2009.