All articles starting with a number or symbol
13,599 articles
221 Eos
221 Eos (A882 BA), K-type main-belt asteroid of about 95 km discovered 1882 by Palisa; parent of the third most populous Eos family (~1.5 Gyr old, partially differentiated) containing the young 2.9 Myr Zelima cluster.
22149 Cinyras
22149 Cinyras is a minor planet named for Cinyras (Κινύρας), legendary king of Cyprus, donor of Agamemnon's corslet in the Iliad, priest-king of Aphrodite at Paphos, and father of Adonis.
22180 Paeon
22180 Paeon (2000 YZ), a large Jupiter Trojan asteroid about 39.8 km across, discovered 19 December 2000 at Anderson Mesa by LONEOS, named for the father of Agastrophus, with a 29.31-degree inclined 11.77-year orbit.
221908 Agastrophus
221908 Agastrophus (2008 QQ) is a mid-sized Jupiter Trojan asteroid in the Greek camp (L4), discovered 21 August 2008 at Marly by P. Kocher; ~9 km across, 11.55-year orbit, not hazardous.
221917 Opites
221917 Opites (2008 SD83) is a Jupiter Trojan asteroid of the Greek camp at L4, discovered 26 September 2008 at Taunus Observatory, orbiting at 5.24 au with a 12-year period, about 9.5 km across.
22199 Klonios
22199 Klonios is a numbered Jupiter Trojan asteroid sharing Jupiter's orbit near the L4 or L5 Lagrange points. The MNRAS resonant-structure survey lists it with resonant coefficients p=2, p5=−6, p6=0, q=2, q6=0, I=8.4, Dis=0.046.
221B Baker Street
221B Baker Street is the fictional London residence of Sherlock Holmes and Dr. Watson in Arthur Conan Doyle's stories, occupied 1881–1904 in the canon. The number did not exist when written; renumbering, Abbey National letters, and the 1990 museum made it real.
222 Lucia
222 Lucia (A882 CA) is a large main-belt asteroid and Themis group member with Tholen type BU, a 7.837-hour rotation period, and suspected hydrated minerals.
22203 Prothoenor
22203 Prothoenor (6020 P-L) is a Jupiter Trojan asteroid discovered 24 September 1960 at Palomar by van Houten, van Houten-Groeneveld, and Gehrels; semi-major axis 5.1986 au, period 11.853 years, H = 11.76 mag.
22222 Hodios
22222 Hodios (3156 T-2) is a Jupiter Trojan asteroid discovered 30 September 1973 by C. J. van Houten and I. van Houten-Groeneveld at Palomar, named for the Greek herald Hodios, with semimajor axis 5.0885 au.
22227 Polyxenos
22227 Polyxenos (5030 T-2) is a large L4 Jupiter Trojan asteroid discovered 25 September 1973 at Palomar by van Houten, van Houten-Groeneveld, and Gehrels; about 13.5 km across, 11.94-year orbit, not hazardous.
2223 Sarpedon
2223 Sarpedon (1977 TL3), a large Jupiter Trojan asteroid about 77.5 km across, discovered 1977 by Purple Mountain Observatory; dark DU-type surface, 22.74-hour rotation, 12.05-year orbit.
223 Rosa
223 Rosa (A882 EA), a ~83 km dark P/X-type outer main-belt asteroid discovered 1882 by Palisa at Vienna; a Themis-family interloper and proposed JUICE flyby target for October 2029.
224 Oceana
224 Oceana, an M-type main-belt asteroid discovered by Johann Palisa at Vienna on 30 March 1882, about 60 km across, albedo 0.17, rotation period 9.385 hours, featureless near-infrared spectrum.
22404 Skujyte
22404 Skujytė, provisionally designated 1995 ME4, is a large Jupiter Trojan asteroid, about 20 kilometers across, sharing Jupiter's 12-year orbit from the leading L4 Lagrangian swarm.
2241 Alcathous
2241 Alcathous (1979 WM) is a large D-type Jupiter Trojan asteroid at the L5 Lagrange point, about 49-59 km in radius, albedo roughly 0.06-0.08, inclination 17.8 degrees, studied by spectroscopy, lightcurves, and occultations.
224P/LINEAR-NEAT
224P/LINEAR-NEAT is a numbered Jupiter-family periodic comet discovered by the LINEAR and NEAT surveys, first observed 2003 November 20, with a 6.2-6.4 year period, perihelion 1.88 au, aphelion 4.8 au, and T_J about 2.95.
225 Henrietta
225 Henrietta, a large outer main-belt asteroid discovered by Johann Palisa in Vienna on 19 April 1882; about 122 km across, rotation period 7.3561 hours, low bulk density near 0.86 g/cm3.
22503 Thalpius
22503 Thalpius (1997 TB12) is a Jupiter Trojan asteroid discovered 7 October 1997 at Kleť Observatory by Tichy and Moravec; semi-major axis 5.2146 au, period 11.9 years, H = 12.31.
225088 Gonggong
225088 Gonggong (2007 OR10, 共工星) is a large scattered-disc dwarf-planet candidate beyond Neptune, discovered in 2007 at Palomar, about 1230 km across, with a moon Xiangliu, a 547-year eccentric orbit, and a 3:10 Neptune resonance.
225276 Leitos
225276 Leitos (1436 T-2) is a roughly 6.9-km Jupiter Trojan asteroid discovered 29 September 1973, named in 2010 after the Iliad figure Leïtos; it orbits the Sun every 11.85 years at 4.38–6.02 AU and poses no Earth hazard.
226 Weringia
226 Weringia (A882 OA) is a large S-type main-belt asteroid, about 31-34 km across, discovered 19 July 1882 by Johann Palisa in Vienna and named for the Währing district; rotation period about 11.2 hours, not hazardous.
2260 Neoptolemus
2260 Neoptolemus (1975 WM1) is a large D-type Jupiter trojan asteroid, about 77 km across, discovered 26 November 1975 by Purple Mountain Observatory at Nanking; orbit a = 5.2017 au, e = 0.0442, i = 17.77°.
227 (TV series)
227 is the NBC sitcom (1985–1990, 116 episodes) starring Marla Gibbs as Mary Jenkins, adapted from a Christine Houston play, part of the 1980s boom of black sitcoms; Jackée Harry won the 1987 Emmy.
227 Philosophia
227 Philosophia (A882 PA) is a large main-belt asteroid discovered 12 August 1882 by Paul Henry at Paris. It orbits at 3.17 AU with a 5.64-year period, rotates in 26.46 hours, is roughly 90-101 km across, and is not potentially hazardous.
228 Agathe
228 Agathe (A882 QA) is a main-belt asteroid about 9.3 km across, discovered 1882 by Johann Palisa in Vienna; S-type, 6.48-hour rotation, not hazardous.
228110 Eudorus
228110 Eudorus (2008 TC9) is a mid-sized Jupiter Trojan asteroid, about 6.2 km across, orbiting the Sun every 12.32 years at 5.14–5.52 AU; not hazardous, not a Lucy target.
229 Adelinda
229 Adelinda (A882 QB), outer main-belt asteroid about 106 km across, discovered by Johann Palisa at Vienna on 22 August 1882; period 6.33 years, rotation 6.599 h, not hazardous.
229762 G!kun||'homdima
229762 G!kun||'homdima (2007 UK126) is a scattered-disk trans-Neptunian dwarf planet candidate about 600 km across, discovered at Palomar in 2007, with a small redder satellite G!ò'é !hú and a density near 1 g/cm3.
229th Aviation Regiment (United States)
The 229th Aviation Regiment, nicknamed the Flying Tigers, is a US Army aviation regiment constituted in 1964, which flew assault helicopter missions with the 1st Cavalry Division in Vietnam.