41 relations: Andrew Graham (astronomer), Apparent magnitude, Asteroid, Asteroid belt, Asteroid family, Astronomical unit, Axial tilt, Chord (astronomy), Comet seeker, Ecliptic coordinate system, Elongation (astronomy), Equatorial coordinate system, Hubble Space Telescope, Inner moon, Iron, Julian day, Julian year (astronomy), Light curve, List of exceptional asteroids, Magnitude (astronomy), Markree Observatory, Metal, Metis (moon), Metis (mythology), Natural satellite, Nickel, Oceanid, Oceanus, Olivine, PDF, Planetary differentiation, Proper orbital elements, S-type asteroid, Silicate, Tethys (mythology), Titan (mythology), Year, 113 Amalthea, 16 Psyche, 17 Thetis, 4 Vesta.
Andrew Graham (8 April 1815 – 5 November 1908), born in Irvinestown County Fermanagh, Ireland, was an Irish astronomer, orbit computer and discoverer of the asteroid 9 Metis.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Asteroids are minor planets, especially those of the inner Solar System.
The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
In the field of astronomy the term chord typically refers to a line crossing an object which is formed during an occultation event.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
A comet seeker is a type of small telescope adapted especially to searching for comets: commonly of short focal length and large aperture, in order to secure the greatest brilliancy of light.
The ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions and orbits of Solar System objects.
In astronomy, a planet's elongation is the angular separation between the Sun and the planet, with Earth as the reference point.
The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects.
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
In astronomy, an inner moon or inner natural satellite is a natural satellite following a prograde, low-inclination orbit inwards of the large satellites of the parent planet.
Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.
Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.
In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.
In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.
The following is a collection of lists of exceptional asteroids in the Solar System.
In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths.
Markree Observatory was an astronomical observatory in County Sligo, Ireland.
A metal (from Greek μέταλλον métallon, "mine, quarry, metal") is a material (an element, compound, or alloy) that is typically hard when in solid state, opaque, shiny, and has good electrical and thermal conductivity.
Metis (Μήτις), also known as, is the innermost moon of Jupiter.
Metis (Greek: Μῆτις - "wisdom," "skill," or "craft"), in ancient Greek religion, was a mythical Titaness belonging to the second generation of Titans.
A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
Nickel is a chemical element with symbol Ni and atomic number 28.
In Greek mythology and, later, Roman mythology, the Oceanids or Oceanides (Ὠκεανίδες, pl.) are water nymphs who were the three thousand daughters of the Titans Oceanus and Tethys.
Oceanus (Ὠκεανός Ōkeanós), also known as Ogenus (Ὤγενος Ōgenos or Ὠγηνός Ōgēnos) or Ogen (Ὠγήν Ōgēn), was a divine figure in classical antiquity, believed by the ancient Greeks and Romans to be the divine personification of the sea, an enormous river encircling the world.
The mineral olivine is a magnesium iron silicate with the formula (Mg2+, Fe2+)2SiO4.
The Portable Document Format (PDF) is a file format developed in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
In planetary science, planetary differentiation is the process of separating out different constituents of a planetary body as a consequence of their physical or chemical behaviour, where the body develops into compositionally distinct layers; the denser materials of a planet sink to the center, while less dense materials rise to the surface, generally in a magma ocean.
The proper orbital elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale.
S-type asteroids are asteroids with a spectral type that is indicative of a silicaceous (i.e. stony) mineralogical composition, hence the name.
In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula, where 0 ≤ x Silicate anions are often large polymeric molecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate), double chains (as in, and sheets (as in. In geology and astronomy, the term silicate is used to mean silicate minerals, ionic solids with silicate anions; as well as rock types that consist predominantly of such minerals. In that context, the term also includes the non-ionic compound silicon dioxide (silica, quartz), which would correspond to x.
In Greek mythology, Tethys (Τηθύς), was a Titan daughter of Uranus and Gaia, sister and wife of Titan-god Oceanus, mother of the Potamoi and the Oceanids.
In Greek mythology, the Titans (Greek: Τιτάν, Titán, Τiτᾶνες, Titânes) and Titanesses (or Titanides; Greek: Τιτανίς, Titanís, Τιτανίδες, Titanídes) were members of the second generation of divine beings, descending from the primordial deities and preceding the Olympians.
A year is the orbital period of the Earth moving in its orbit around the Sun.
113 Amalthea is a fairly typical rocky main-belt asteroid orbiting in the inner regions of the belt.
16 Psyche is one of the ten most massive asteroids in the asteroid belt.
17 Thetis, provisional designation, is a stony asteroid from the inner regions of the asteroid belt, approximately 90 kilometers in diameter.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.
Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of.