Discovery [1] [2] | |
---|---|
Discovered by | Catalina Sky Srvy. |
Discovery site | Catalina Stn. |
Discovery date | 22 October 2005 |
Designations | |
2005 UD | |
NEO · Apollo [3] | |
Orbital characteristics [3] | |
Epoch 1 July 2020 (JD 2459396.5) | |
Uncertainty parameter 0 | |
Observation arc | 38.76 yr (14,157 days) |
Earliest precovery date | 11 November 1982 [4] |
Aphelion | 2.387 AU |
Perihelion | 0.1629 AU |
1.275 AU | |
Eccentricity | 0.8722 |
1.44 yr (525.8 days) | |
1.976° | |
0° 41m 5.026s / day | |
Inclination | 28.660° |
19.714° | |
207.603° | |
Earth MOID | 0.07759 AU (11,607,000 km) |
Mercury MOID | 0.09496 AU (14,206,000 km) |
Venus MOID | 0.07997 AU (11,963,000 km) |
Mars MOID | 0.04058 AU (6,071,000 km) [1] |
Physical characteristics | |
Mean diameter | 1.28±0.02 km [5] |
5.23400+0.00004 −0.00001 h [5] | |
Pole ecliptic latitude | −25.8°+5.3° −12.5° [5] |
Pole ecliptic longitude | 285.8°+1.1° −5.3° [5] |
0.14±0.02 [5] | |
C [6] | |
17.0 (discovery) [2] | |
17.22±0.03 [5] 17.51±0.02 [7] 17.42 [3] [1] | |
(155140) 2005 UD (provisional designation 2005 UD) is an asteroid on an eccentric orbit, classified as a near-Earth object of the Apollo group. It was discovered on 22 October 2005, by the Catalina Sky Survey at the Catalina Station in Arizona, United States. 2005 UD is thought to be a possible fragment of 3200 Phaethon due to its similar orbit, [8] [9] although it is not dynamically associated with the Geminid meteor stream produced by Phaethon. [10] [11]
Due to 2005 UD's highly eccentric orbit, it experiences extreme temperature variations up to 975 K (702 °C; 1,295 °F) at perihelion, leading to thermal fracturing of its surface regolith and ejection of dust particles. [12] However, no activity from 2005 UD has been observed as of yet, though it has been suspected that it could be the inactive parent body of the Daytime Sextantids meteor shower. [7] [13] 2005 UD and Phaethon share a bluish surface color at visible wavelengths, but differ at near-infrared wavelengths where 2005 UD appears redder than Phaethon. [13]
2005 UD will pass 0.0558 AU (8.35 million km ) from Mars on 20 July 2024. [3]
Object | Size | Earth MOID (AU) | Perihelion (AU) | Mars MOID (AU) |
---|---|---|---|---|
3200 Phaethon | 6 km | 0.02 AU (3.0 million km ) | 0.14 AU (21 million km) | 0.14 AU (21 million km) |
(155140) 2005 UD [3] | 1.3 km | 0.08 AU (12 million km) | 0.16 AU (24 million km) | 0.04 AU (6.0 million km) [1] |
(225416) 1999 YC [15] | 1.7 km | 0.25 AU (37 million km) | 0.24 AU (36 million km) | 0.10 AU (15 million km) |
16 Psyche is a large M-type asteroid, which was discovered by the Italian astronomer Annibale de Gasparis, on 17 March 1852 and named after the Greek goddess Psyche. The prefix "16" signifies that it was the sixteenth minor planet in order of discovery. It is the largest and most massive of the M-type asteroids, and one of the dozen most massive asteroids. It has a mean diameter of approximately 220 kilometers (140 mi) and contains about one percent of the mass of the asteroid belt. It was thought to be the exposed core of a protoplanet, but recent observations cast doubt on that hypothesis. Psyche will be explored by NASA, with a spacecraft of the same name, marking the first time a manmade object will journey to a metallic asteroid, launched on 13 October 2023, with an expected arrival in 2029.
The Geminids are a prolific meteor shower caused by the object 3200 Phaethon, which is thought to be a Palladian asteroid with a "rock comet" orbit. This would make the Geminids, together with the Quadrantids, the only major meteor showers not originating from a comet. The meteors from this shower are slow moving, can be seen in December and usually peak around December 4–16, with the date of highest intensity being the morning of December 14. Recent showers have seen 120–160 meteors per hour under optimal conditions, generally around 02:00 to 03:00 local time. Geminids were first observed in 1862, much more recently than other showers such as the Perseids and Leonids.
In planetary astronomy, a centaur is a small Solar System body that orbits the Sun between Jupiter and Neptune and crosses the orbits of one or more of the giant planets. Centaurs generally have unstable orbits because they cross or have crossed the orbits of the giant planets; almost all their orbits have dynamic lifetimes of only a few million years, but there is one known centaur, 514107 Kaʻepaokaʻawela, which may be in a stable orbit. Centaurs typically exhibit the characteristics of both asteroids and comets. They are named after the mythological centaurs that were a mixture of horse and human. Observational bias toward large objects makes determination of the total centaur population difficult. Estimates for the number of centaurs in the Solar System more than 1 km in diameter range from as low as 44,000 to more than 10,000,000.
3200 Phaethon, provisionally designated 1983 TB, is an active Apollo asteroid with an orbit that brings it closer to the Sun than any other named asteroid. For this reason, it was named after the Greek myth of Phaëthon, son of the sun god Helios. It is 5.8 km (3.6 mi) in diameter and is the parent body of the Geminids meteor shower of mid-December. With an observation arc of 35+ years, it has a very well determined orbit. The 2017 Earth approach distance of about 10 million km was known with an accuracy of ±700 m.
(55565) 2002 AW197 is a classical, non-resonant trans-Neptunian object from the Kuiper belt in the outermost region of the Solar System, also known as a cubewano. With a likely diameter of at least 700 kilometers (430 miles), it is approximately tied with 2002 MS4 and 2013 FY27 (to within measurement uncertainties) as the largest unnamed object in the Solar System. It was discovered at Palomar Observatory in 2002.
Zerlina, provisional designation 1904 NW, carbonaceous Palladian asteroid from the central region of the asteroid belt, approximately 18 kilometers in diameter. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 12 April 1904.
698 Ernestina is a background asteroid, approximately 27 kilometers in diameter, located in the outer regions of the asteroid belt. It was discovered on 5 March 1910, by German astronomer Joseph Helffrich at the Heidelberg-Königstuhl State Observatory. The presumed carbonaceous C-type asteroid has a rotation period of 5.0 hours. It was named after Ernst Wolf, son of German astronomer and prolific discoverer of minor planets, Max Wolf.
776 Berbericia is a minor planet orbiting the Sun. A main-belt C-type asteroid, it was discovered on 24 January 1914 by astronomer Adam Massinger at Heidelberg Observatory in southwest Germany. It was named by Max Wolf in honor of Adolf Berberich (1861–1920), a German astronomer. The spectra of the asteroid displays evidence of aqueous alteration.
877 Walküre is a dark background asteroid from the inner regions of the asteroid belt, approximately 38 kilometers in diameter. It was discovered on 13 September 1915, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The carbonaceous F/C-type asteroid has a rotation period of 17.4 hours and is likely elongated in shape. It was named after the female spirit Valkyrie from Norse mythology, best known from Wagner's opera Die Walküre.
(24835) 1995 SM55, provisional designation 1995 SM55, is a trans-Neptunian object and member of the Haumea family that resides in the Kuiper belt, located in the outermost region of the Solar System. It was discovered on 19 September 1995, by American astronomer Nichole Danzl of the Spacewatch program at Kitt Peak National Observatory near Tucson, Arizona, in the United States. It measures approximately 200 kilometers in diameter and was the second-brightest known object in the Kuiper belt, after Pluto, until 1996 TO66 was discovered.
1119 Euboea is a background asteroid from the central region of the asteroid belt. It was discovered on 27 October 1927, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid has a rotation period of 11.4 hours and measures approximately 30 kilometers in diameter. It was named for the Greek island of Euboea.
1749 Telamon is a dark Jupiter Trojan from the Greek camp, approximately 70 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 23 September 1949, and named after Telamon from Greek mythology. The D-type asteroid is the principal body of the proposed Telamon family and belongs to the 60 largest Jupiter trojans. It has a rotation period of 17.0 hours and possibly a spherical shape.
83982 Crantor, prov. designation: 2002 GO9, is a centaur in a 1:1 resonance with Uranus, approximately 60 kilometers (37 miles) in diameter. It was discovered on 12 April 2002, by astronomers of the Near-Earth Asteroid Tracking at the Palomar Observatory in California, United States. This minor planet was named for Crantor from Greek mythology.
5028 Halaesus is a Jupiter trojan from the Greek camp, approximately 51 kilometers in diameter. It was discovered on 23 January 1988 by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark D-type asteroid has a rotation period of 24.9 hours and belongs to the 100 largest Jupiter trojans. It was named after Halaesus from Greek mythology.
147P/Kushida–Muramatsu is a quasi-Hilda comet discovered in 1993 by Japanese astronomers Yoshio Kushida and Osamu Muramatsu.
7526 Ohtsuka, provisional designation 1993 AA, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Japanese astronomer Takeshi Urata at Nihondaira Observatory Oohira Station, Japan, on 2 January 1993. The asteroid was named after Japanese astronomer Katsuhito Ohtsuka.
TRAPPIST-1h, also designated as 2MASS J23062928-0502285 h, is an exoplanet orbiting around the ultra-cool dwarf star TRAPPIST-1, located 40.7 light-years away from Earth in the constellation Aquarius. It was one of four new exoplanets to be discovered orbiting the star in 2017 using observations from the Spitzer Space Telescope. In the following years, more studies were able to refine its physical parameters.
WASP-72 is the primary of a binary star system. It is an F7 class dwarf star, with an internal structure just on the verge of the Kraft break. It is orbited by a planet WASP-72b. The age of WASP-72 is younger than the Sun at 3.55±0.82 billion years.