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Alphonse Borrelly
Alphonse Louis Nicolas Borrelly (December 8, 1842 – February 28, 1926) was a French astronomer born in Roquemaure, Gard. He joined the Marseille Observatory in 1864. In the course of his career, he discovered a number of asteroids and comets, including the periodic comet 19P/Borrelly. He also discovered five NGC objects, all galaxies. The French Academy of Sciences awarded him the Prix Valz for 1903 and the Prix Lalande for 1909. The asteroid 1539 Borrelly was named in his honor. In 1913, he received the Prix Jules Janssen, the highest award of the Société astronomique de France, the French astronomical society. Discoveries Comets discovered or co-discovered The following is an incomplete list of comets discovered or co-discovered by Borrelly: * C/1873 Q1 (Borrelly) * C/1877 C1 (Borrelly) * C/1877 G2 (Swift-Borrelly-Block) * C/1889 X1 (Borrelly) * C/1900 O1 (Borrelly–Brooks) * 19P/Borrelly Comet Borrelly or Borrelly's Comet (official designation: 19P/Borrell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomer
An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galaxies – in either observational astronomy, observational (by analyzing the data) or theoretical astronomy. Examples of topics or fields astronomers study include planetary science, Sun, solar astronomy, the Star formation, origin or stellar evolution, evolution of stars, or the galaxy formation and evolution, formation of galaxies. A related but distinct subject is physical cosmology, which studies the Universe as a whole. Types Astronomers typically fall under either of two main types: observational astronomy, observational and theoretical astronomy, theoretical. Observational astronomers make direct observations of Astronomical object, celestial objects and analyze the data. In contrast, theoretical astronomers create and investigate Con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
120 Lachesis
120 Lachesis is a large main-belt asteroid. It was discovered by French astronomer Alphonse Borrelly on April 10, 1872, and independently by German-American astronomer Christian Heinrich Friedrich Peters on April 11, 1872, then named after Lachesis, one of the Moirai, or Fates, in Greek mythology. A Lachesean occultation of a star occurred in 1999 and was confirmed visually by five observers and once photoelectrically, with the chords yielding an estimated elliptical cross-section of . This body is orbiting the Sun with a period of 5.50 years and an eccentricity (ovalness) of 0.05. The orbital plane is inclined by 7° to the plane of the ecliptic. Photometric observations of this asteroid were made in early 2009 at the Organ Mesa Observatory in Las Cruces, New Mexico. The resulting light curve shows a synodic rotation period of 46.551 ± 0.002 hours with a brightness variation of 0.14 ± 0.02 in magnitude. It is a very slow rotator with the longest rotation period of an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
369 Aëria
369 Aëria provisional designation , is a metallic asteroid and the parent body of the Aeria family. It orbits in the central region of the asteroid belt, rotates every 4.778 hours and measures approximately 65 kilometers in diameter. The asteroid was discovered on 4 July 1893, by French astronomer Alphonse Borrelly at the Marseille Observatory in southeastern France. It was named for " Air", one of the four classical elements: earth, water, air and fire. Orbit and classification ''Aëria'' is the parent body of the Aeria family (), a small asteroid family of less than 300 known members, while the Lightcurve Data Base dynamically groups it to the much larger Eunomia family (). Named members of the Aeria family include 1184 Gaea, 3324 Avsyuk, 130066 Timhaltigin and 144303 Mirellabreschi. ''Aëria'' orbits the Sun in the central main-belt at a distance of 2.4–2.9 AU once every 4 years and 4 months (1,577 days). Its orbit has an eccentricit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
322 Phaeo
322 Phaeo is an asteroid from the central regions of the asteroid belt, approximately in diameter. It was discovered on 27 November 1891, by French astronomer Alphonse Borrelly at the Marseille Observatory in southern France. The presumably metallic X-type asteroid is the principal body of the Phaeo family and has a rotation period of 17.6 hours. It was named for the Greek mythological figure Phaeo, one of the Hyades or nymph A nymph (; ; sometimes spelled nymphe) is a minor female nature deity in ancient Greek folklore. Distinct from other Greek goddesses, nymphs are generally regarded as personifications of nature; they are typically tied to a specific place, land ...s. Several other asteroids were named for other of the Hyades – 193 Ambrosia, 158 Koronis, 217 Eudora, and 308 Polyxo.Lutz D. Schmadel, ''Dictionary of Minor Planet Names'', p. 42. Springer, . References External links Asteroid Lightcurve Database (LCDB) query form) Dictionary of Minor Plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
308 Polyxo
308 Polyxo is a main-belt asteroid that was discovered by Alphonse Borrelly on 31 March 1891, in Marseille. It is orbiting the Sun at a distance of with a low orbital eccentricity (ovalness) of 0.04 and a period of . The orbital plane is tilted at an angle of 4.36° to the plane of the ecliptic. 308 Polyxo is classified as a rare T-type asteroid, with a spectrum that bears some similarity to the Tagish Lake meteorite. A spectral feature at a wavelength of suggests aqueous alteration of some surface materials. Photometric measurements reported in 1983 give a rotation period of 12.03 hours and a brightness variation of 0.20 in magnitude. The adaptive optics instrument at the W. M. Keck Observatory shows an oblate object with a diameter of 130 km. The size ratio between the major and minor axes is 1.26 ± 0.11. Light curves for this object suggests it has a very irregular shape. Stellar occultation events were observed for this asteroid during 2000 and 2004. The resultin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
268 Adorea
268 Adorea is a very large main belt asteroid, about in width. It was discovered by Alphonse Borrelly on 8 June 1887 in Marseille. This asteroid is a member of the Themis family and is classified as a primitive carbonaceous F-type/C-type asteroid. It is orbiting the Sun at a distance of with an orbital eccentricity (ovalness) of 0.14 and a period of . The orbital plane is tilted at an angle of 2.44° to the plane of the ecliptic. From 23 February until 2 March 2006, photometric measurements were taken of the asteroid. These were used to produce a light curve showing a rotation period of with a brightness variation of in magnitude. This result is consistent with some, but not all previous results. Some studies had suggested a longer rotation period of ; double the time measured. However, the new data is inconsistent with the longer period. In May 1979, 268 Adorea was positioned in proximity of the galaxy NGC 4517 and as a bright new light source it was identified as a po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
246 Asporina
246 Asporina is a sizeable main-belt asteroid. It is classified as one of the few A-type asteroids. It was discovered by Alphonse Borrelly on 6 March 1885 in Marseille and was named after Asporina, a goddess worshipped on Mount Asporenus, Asia Minor. The spectrum of 246 Asporina reveals the strong presence of the mineral olivine The mineral olivine () is a magnesium iron Silicate minerals, silicate with the chemical formula . It is a type of Nesosilicates, nesosilicate or orthosilicate. The primary component of the Earth's upper mantle (Earth), upper mantle, it is a com ..., a relative rarity in the asteroid belt. References External links The Asteroid Orbital Elements DatabaseAsteroid Lightcurve Data File* * Background asteroids Asporina Asporina A-type asteroids (Tholen) A-type asteroids (SMASS) 18850306 {{Beltasteroid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
240 Vanadis
240 Vanadis is a fairly large main-belt asteroid with a diameter of around 100 km. It was discovered by Alphonse Borrelly on August 27, 1884, in Marseille and was named after Freyja (Vanadis), the Norse fertility goddess. The asteroid is orbiting the Sun at a distance of with a period of and an orbital eccentricity of 0.206. The orbital plane is inclined at an angle of 2.10° to the plane of the ecliptic. Photometric observations of the asteroid made during 2022 were used to produce a light curve that showed a rotation period of with a brightness variation of in magnitude. This is consistent with earlier estimates. It is very dark and is classified as a C-type asteroid, probably composed of primitive carbon Carbon () is a chemical element; it has chemical symbol, symbol C and atomic number 6. It is nonmetallic and tetravalence, tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 ...aceous materi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
233 Asterope
233 Asterope is a large main-belt asteroid that was discovered on 11 May 1883, by French astronomer Alphonse Borrelly at Marseille Observatory in Marseille, France. The asteroid was named after Asterope (or Sterope), one of the Pleiades. This asteroid is orbiting the Sun with a semimajor axis of , a period of 4.34 years, and an eccentricity of 0.10. The orbital plane is inclined by 7.68° to the plane of the ecliptic. It is a rare T-type asteroid and has a relatively dark surface. The spectrum of 233 Asterope bears a resemblance to Troilite, a sulfurous iron mineral found in most iron meteorites. Photometric observations during 1995 show a rotation period of 19.743 hours. Measurements made with the IRAS observatory give a diameter of 109.56 ± 5.04 km and a geometric albedo In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e. at zero phase angle (astronomy), phase angle) to that of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
198 Ampella
198 Ampella is a Main belt asteroid that was discovered by Alphonse Borrelly on June 13, 1879. The name seems to be the feminine form of Ampelos, a satyr and good friend of Dionysus in Greek mythology. It could also derive from the Ampelose (plural of Ampelos), a variety of hamadryad. It is an S-type asteroid. So far Ampella has been observed occulting a star once, on November 8, 1991, from New South Wales, Australia. This asteroid has been resolved by the W. M. Keck Observatory, resulting in a size estimate of 53 km. It is oblate in shape, with a size ratio of 1.22 between the major and minor axes. Measurements from the IRAS observatory gave a similar size estimate of 57 km. Photometric measurements made in 1993 give a rotation period In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
173 Ino
173 Ino is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately in diameter. It was discovered on 1 August 1877, by French astronomer Alphonse Borrelly at Marseille Observatory in southern France, and named after the queen Ino from Greek mythology. The dark Xk-type asteroid has a rotation period of 6.15 hours. Orbit and classification ''Ino'' is the parent body and namesake of the Ino family (), an asteroid family in the intermediate main belt with nearly 500 known members. The adjectival form of the asteroid name is "Inoan". It orbits the Sun in the central main-belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,659 days; semi-major axis of 2.74 AU). Its orbit has an eccentricity of 0.21 and an inclination of 14 ° with respect to the ecliptic. The body's observation arc begins at Düsseldorf-Bilk Observatory in January 1879, five months after its official discovery ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
172 Baucis
172 Baucis is a large main belt asteroid that was discovered by French astronomer Alphonse Borrelly on February 5, 1877, and named after a fictional character in the Greek legend of Baucis and Philemon. The adjectival form of the name is ''Baucidian.'' It is classified as an S-type asteroid based upon its spectrum. Photometric observations of this asteroid from the southern hemisphere during 2003 gave a light curve that indicated a slow synodic rotation period of 27.417 ± 0.013 hours and a brightness variation of 0.25 in magnitude. Polarimetric study of this asteroid reveals anomalous properties that suggests the regolith consists of a mixture of low and high albedo Albedo ( ; ) is the fraction of sunlight that is Diffuse reflection, diffusely reflected by a body. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects ... material. This may have been caused by fragmentation of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |