Synonyms for luhman or Related words with luhman
Examples of "luhman"
The proper motion of
16 as published by Sahlmann & Lazorenko (2015), is about 2.75″/year, which is relatively large due to the proximity of
Eric E. Mamajek proposed the name
16 for the system, with the components called
16B. The name originates from the frequently updated Washington Double Star Catalog (WDS):
has already published several new discoveries of binary stars that have been compiled in the WDS with discovery identifier "LUH". The WDS catalog now lists this system with the identifier 10493−5319 and discoverer designation LUH 16.
16 is closer to Proxima Centauri than to Alpha Centauri AB, just like Earth, despite the fact that
16 is located further from Earth than Alpha Centauri system. This is due to the fact that
16 has smaller angular distance to Proxima Centauri than to Alpha Centauri AB in Earth's sky, and this makes more contribution to the distance difference from
16 to Alpha Centauri than the distance difference between them and Earth.
, Stauffer, & Mamajek (2005) demonstrated that the AB Dor Moving Group
16 is the nearest known star/brown-dwarf system to Alpha Centauri, located from Alpha Centauri AB, and from Proxima Centauri. This is due to both systems being located in neighboring constellations, in the same part of the sky as seen from Earth but
16 is a bit farther away. Before the discovery of
16, the Solar System was the nearest known system to Alpha Centauri.
16A has also been observed in the same fashion as 16B, no similar variance in illumination was found.
Alpha Centauri is inside the G-cloud, and the nearest known system to it is
16 at .
The trigonometric parallax of
16 as published by Sahlmann & Lazorenko (2015) is arcsec, corresponding to a distance of .
Mamajek (2013) discussed the elongation of the ESO 1984 optical image of
16 and similar position angle in its 1984 and 2013 images, supposing that the
(2013) orbital period estimate of about 30 years is not far from the actual period.
Subsequent astrometric monitoring of
16 with the Very Large Telescope has excluded the presence of any third object with a mass greater than orbiting around either brown dwarf with a period between 20 and 300 days.
16 does not contain any close-in giant planets.
The rationale is that
16 is easier to remember than WISE J104915.57−531906.1 and that "it seems silly to call this object by a 24-character name (space included)". The "phone number names" also include WISE J1049−5319 and WISE 1049−5319.
–WISE 1 was proposed as another alternative.
In 1974, William
succeeded Stewart as director of PMO and the Glee Club. A man described as a “piano wizard with perfect pitch,”
was a former Glee Clubber himself, graduating in 1949. Luhman’s career had developed at Stewart’s side, having accompanied the Glee Club for 17 years before taking the helm. While loyal to Stewart’s music philosophy,
expressed some of his own interests by starting many Glee Club specialty groups. When illness and an untimely death cut short Luhman’s efforts, he was succeeded by accomplished pianist William Allen.
is a professor of astronomy and astrophysics from Pennsylvania State University who is notable for having discovered both the third closest stellar system
16 and the fourth closest stellar system WISE 0855−0714 to the Sun. Both systems are actually made up of substellar objects (objects less massive than stars), falling into the category of brown dwarfs (
16) or even less massive objects (WISE 0855−0714) which are officially termed sub-brown dwarfs but also referred to as "free floating planets" or "planetary mass objects". WISE 0855−0714 (discovery published in 2014) is also the coldest massive object outside the solar system that has been directly imaged.
In the discovery paper the orbital period estimate of
16 AB, based on its separation and the substellar masses, is about 25 years.
A study by Gillon "et al." (2013) found that
16B exhibited uneven surface illumination during its rotation. On 5 May 2013, Crossfield "et al." (2014) used the European Southern Observatory Very Large Telescope (VLT) to directly observe the
16 system for five hours, the equivalent of a full rotation of
16B. Their research confirmed Gillon "et al." observation, finding a large, dark region at the middle latitudes, a bright area near its upper pole, and mottled illumination elsewhere. They suggest this variant illumination indicates "patchy global clouds", where darker areas represent thick clouds and brighter areas are holes in the cloud layer permitting light from the interior. Gillon "et al." determined that
16B's illumination patterns change rapidly, on a day-to-day basis.
16 now bears the discoverer's name following common practice for very nearby stars that have been discovered in modern times.
In a study by Osten "et al." (2015),
16 was observed with the Australia Telescope Compact Array in radio waves and with the Chandra X-ray Observatory in X-rays. No radio or X-ray activity was found at
16 AB, and constraints on radio and X-ray activity were presented, which are "the strongest constraints obtained so far for the radio and X-ray luminosity of any ultracool dwarf".
On the ESO Schmidt telescope image, taken in 1984, the source looks elongated with a position angle of 138°. The similarity of this position angle with that of the resolved pair in the GMOS image (epoch 2013) in Fig. 1 of
(2013) suggests that the time period between 1984 and 2013 may be close to the orbital period of the system (not far from original orbital period estimate by
graduated from the University of Texas with a B.A. in astronomy and a B.S. in physics in 1993. He earned his Ph.D. in astronomy from the University of Arizona in 1998.
The discovery of a binary brown dwarf system named
16 only 6.6 light years away, the third closest system to the Solar System, was announced on 11 March 2013.
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