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Topic: The Equatorial Stars

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Telescope mount - Wikipedia, the free encyclopedia By tilting the horizontal base of an alt-az system up until it is parallel to Earth's equatorial plane, the azimuth rotation then swings the telescope in an arc that follows the stars as they move across the sky due to Earth's rotation. Many sorts of mounts have been developed over the years, with the majority of effort being put into systems that can track the motion of the stars as the Earth rotates with a single motion. In astronomy, the telescope mount is an important part of the overall design of an operational telescope. en.wikipedia.org /wiki/Telescope_mount   (335 words)

Search Results for bulge - Encyclopædia Britannica Surrounding the nucleus is an extended bulge of stars that is nearly spherical in shape and that consists primarily of Population II stars, though they are comparatively rich in heavy elements. Nearly spherical in shape, this region is populated by the outer globular clusters,... The space above and below the disk of the Galaxy is occupied by a thinly populated extension of the central bulge. www.britannica.com /search?query=bulge&submit=Find&source=MWTEXT   (429 words)

Ursa Major and Ursa Minor Polaris - Polaris or North Star,star nearest the north celestial pole (see equatorial coordinate system). Little Dipper - Little Dipper, familiar configuration of stars in the constellation Ursa Minor (see Ursa Major and... Big Dipper - Big Dipper, familiar configuration of stars visible in the constellation Ursa Major (see Ursa Major... www.factmonster.com /ce6/sci/A0850210.html   (443 words)

Satellite Observing: Orbital Elements Since the orbit is fixed relative to the stars and not to the surface of the Earth, the astronomical coordinate system of right ascension and declination is used to measure the position of the ascending node. Right ascension is an angle measured in the equatorial plane from a fixed point in space, called the point of Ares (which is also the point of the vernal equinox, where there Sun crosses the equator in the spring). The orbit ellipse lies in a plane, and this plane forms an angle with the plane of the equator. www.znark.com /sat/elements.html   (443 words)

sample-exam3 (4) infrared radiation, observed from such regions, has been interpreted as being from stars just now collapsing from clouds (5) knots and condensations are seen that may be regions of gas just beginning to collapse under their own gravitational attraction 0 15. (2) The polar regions rotate at the same rate as the equatorial. (1) The polar regions rotate slower than the equatorial regions. www.astro.ufl.edu /~gott/AST1002/Sample_Exams/sample-exam3   (443 words)

Starry Night Pro Help However, due to precession, the equatorial and the ecliptic planes are slowly changing their positions relative to the background stars. Inclination is the angle between the orbital plane and the equatorial plane, measured between 0° and 180°. There are two standard reference planes, the equatorial plane of the Earth and the ecliptic plane (the plane of Earth's orbit around the Sun). www.starrynightpro.com /help/OEElements.shtml   (1832 words)

Howstuffworks "How Telescopes Work" equatorial - type of telescope mount that uses two axes (right ascension, or polar, and declination) aligned with the poles to track the motion of an object across the sky. Although the alt-azimuth mount is simple and easy to use, it does not properly track the motion of the stars. German equatorial mount - shaped like a "T." The long axis of the "T" is aligned with the Earth's pole. science.howstuffworks.com /telescope5.htm   (582 words)

The 50 Brightest Stars Cosmobrain Bright Star Catalog It is intended for use as a source of some basic astronomical and astrophysical data for the 50 brightest stars visible from Earth. For each star, this table contains the proper name, Bayer and/or Flamsteed name, visual apparent magnitude, distance in light years, accuracy of the distance in per cent, absolute magnitude, spectral types, equatorial coordinates for J2000.0 and Hipparcos catalog number. Stars are listed in the order of decreasing visual magnitude. www.cosmobrain.com /cosmobrain/res/brightstar.html   (582 words)

The 50 Brightest Stars Cosmobrain Bright Star Catalog For each star, this table contains the proper name, Bayer and/or Flamsteed name, visual apparent magnitude, distance in light years, accuracy of the distance in per cent, absolute magnitude, spectral types, equatorial coordinates for J2000.0 and Hipparcos catalog number. It is intended for use as a source of some basic astronomical and astrophysical data for the 50 brightest stars visible from Earth. Stars are listed in the order of decreasing visual magnitude. www.cosmobrain.com /cosmobrain/res/brightstar.html   (195 words)

Matrix Astrology Software : Learn Astrology - Visual Astrology - Declination and Latitude Now the interesting fact about the relation between geographic latitude and declination in the equatorial sphere is that there exists a circle of stars on the celestial sphere located at a declination that matches the geographic latitude of your home. In fact, the equatorial system is nothing more than the complete set of geographic coordinates (circles of longitude and circles of latitudes of the Earth) expanded and projected to cosmic size. The equator or equatorial system is based, as many of you will know, on the Earth and its equator as the fundamental reference plane. www.thenewage.com /resources/vastrology/eqsys.asp?orig=   (741 words)

THE MOON, THE SUN & THE 56 YEAR PANIC CYCLE The plane of the equatorial bulge is tilted in relation to the ecliptic by 23.5 degrees (called the obliquity). The combined effect is to try to decrease the angle between the Earth& equatorial plane and the ecliptic, but the Earth resists such forces as it rotates with angular momentum. The equinox points move clockwise (retrograde) against the background of fixed stars, while the Moon's nodes also move clockwise around the ecliptic circle in the nutation cycle of 18.6 years. www.davidmcminn.com /pages/smnum56.htm   (3642 words)

Equatorial coordinate system - Wikipedia, the free encyclopedia The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short). Unlike longitude, right ascension is usually measured in hours instead of degrees, because the apparent rotation of the equatorial coordinate system is closely related to sidereal time and hour angle. Because of the precession and nutation just referred to, when considering long intervals between observations it is necessary to specify an epoch (frequently J2000.0, for older data B1950.0) when specifying coordinates of planets, stars, galaxies, etc. en.wikipedia.org /wiki/Equatorial_coordinate_system   (332 words)

"Amateur Astronomy". Celestial Mechanics Definitions List Equatorial coordinate system used by professionals is technically a dynamical system based on the definition of its equator and its point of origin by reference to Earth's motion, complemented with a set of 1,535 bright stars (this set is said "Fifth Fundamental Catalogue (FK5)"). The equatorial coordinate system is affixed to the celestial sphere. The main axis (or polar axis) of the equatorial system is the celestial sphere' axis. stars5.netfirms.com /definitions.htm   (2243 words)

The 50 Brightest Stars Cosmobrain Bright Star Catalog It is intended for use as a source of some basic astronomical and astrophysical data for the 50 brightest stars visible from Earth. For each star, this table contains the proper name, Bayer and/or Flamsteed name, visual apparent magnitude, distance in light years, accuracy of the distance in per cent, absolute magnitude, spectral types, equatorial coordinates for J2000.0 and Hipparcos catalog number. Sirius is the brightest star in the night sky, visible in the constellation of the Big Dog. www.cosmobrain.com /cosmobrain/res/brightstar.html   (2243 words)

Spherical Coordinate System Lab This coordinate system is based upon the physical fact that we live in a flattened disk of stars that the solar system revolves about in approximately 250 million years. Declination is the other coordinate in the celestial equatorial coordinate system and it is measured perpendicular to the celestial equator. This coordinate system is based upon the physical fact that we live on the earth and gravity pulls us to the earth establishing and up and a down locally. www.mc.cc.md.us /Departments/planet/planet/Coordinate_Systems_Lab.htm   (1626 words)

MSN Encarta - Astronomy In the equatorial coordinate system, the celestial sphere turns with the stars (but this movement is really caused by the rotation of Earth). The equatorial coordinate system is a coordinate system fixed on the sky. The two most widely used are the altazimuth system and the equatorial system. ca.encarta.msn.com /encyclopedia_1741502444_5/Astronomy.html   (1281 words)

standards-main.html The Landolt 1992 database of equatorial standards contain some stars that are close enough together to be imaged as one field. Standard stars are used to get photometric data by comparing the magnitude of the standard to the magnitude of the object being studied. Standard stars can be selected by RA/dec. The databases sort stars by RA coordinate, so it shouldn't be too hard to find a star that is close to the object you're imaging. aci50.astronomy.pomona.edu /common/webdocuments/standards-main.html   (1325 words)

Calculating stellar positions Converting from Cartesian coordinates to other coordinate systems, such as equatorial coordinates, is generally fairly straightforward. If you've done a lot of astronomical observing or calculations, you're familiar with the equatorial coordinate system of right ascension and declination (if not, go to It's also very easy to calculate the distances between stars after such a translation. www.astronexus.com /armchair/3d/positions.html   (468 words)

Stellar Catalogs The fainter stars are included for use by on-going wide-field surveys with somewhat larger instruments, such as those in search of asteroids, and for calibration of digitized sky survey plates, such as the USNO series of immense star catalogues. Since I have stars much fainter than the limiting magnitude of the TASS cameras in these fields, if observers supply me with their extracted data files, I can see what the true limiting magnitude and saturation magnitude of the cameras are under varying conditions and filters. This is the list of 735 known or suspected variables in the +-1.5 degree equatorial region from the Tycho catalog. www.tass-survey.org /tass/catalogs/catalogs.html   (12757 words)

Main Index of Equatorial UBVRI Photometric Standard Stars Finding charts for these stars may be viewed by clicking either the star's name or the chart number(s). Main Index of Equatorial UBVRI Photometric Standard Stars Selected UBVRI Photometric Standard Stars from Landolt 1992, AJ, 104, 340 www.noao.edu /wiyn/obsprog/images/tableA.html   (59 words)

WOCS1_n188.readme Equatorial coordinates for equinox J2000 and epoch 1996.10 were kindly derived by Imants Platais, Yale University, using 160 reference stars from the HST Guide Star Catalog. We estimate the external accuracy (tie to the Landolt system) to be <= 0.01 mag for the brightest stars (V < 17) and <= 0.032 mag for the fainter stars blueward of V-I = 2. The standard error of the coordinates is 0.14", primarily limited by the accuracy of GSC star positions. www.astro.ufl.edu /~ata/wocs/WOCS1_n188.readme   (211 words)

UBVRI Photometric Standard Stars Around the Celestial Equator Most of the stars are in Selected Areas 92-115 and fall in the magnitude range of about 7 to 12.5 in V and color range -0.3 to +2.0 in B-V. The data include equatorial coordinates, photoelectric magnitudes and colors, numbers of observations, and computed internal errors. However, proper motions have been accounted for in computing the 1985 coordinates for the large proper-motion stars, so these positions are given for equinox and epoch 1985.0. The catalog is intended to provide a uniform set of new standards, available to various sizes of telescopes in both hemispheres, on an internally consistent, homogeneous system. www.cs.wisc.edu /niagara/data/nasa/2118.xml   (379 words)

2MASS Photometric Calibration Strategy Select fields containing known red standard stars for some of the equatorial fields so that occasional observations of red calibrators will be made to monitor photometric transformations over time. Because the candidate calibration star samples have very few stars at +30deg declination in the 20-22hr range, selected a field in that area that can be calibrated over the first few months of observations. Mcal = Minst + c1 - c2*(X-1.0) + [c3*C] where c1 is the photometric zero point, or offset, c2 is extinction coefficient (mag/airmass), X is airmass (sec z), Minst is instrumental magnitude of star, and Mcal is the calibrated magnitude. spider.ipac.caltech.edu /staff/roc/2mass/calib/calib.plan.v4.2.html   (2478 words)

The 50 Brightest Stars Cosmobrain Bright Star Catalog It is intended for use as a source of some basic astronomical and astrophysical data for the 50 brightest stars visible from Earth. Stars are listed in the order of decreasing visual magnitude. At a distance of only 8.7 light years, Sirius is the 5th nearest star system known. www.cosmobrain.com /cosmobrain/res/brightstar.html   (195 words)

INSTRUMENTS - Online Information article about INSTRUMENTS South of the equatorial telescope which they employed in their measurements of ~.s double stars. Dollond in 1758 for achromatic objectives are still used for all the largest of the modern refracting telescopes. The polar axis was similar in shape to that of fig. encyclopedia.jrank.org /I27_INV/INSTRUMENTS.html   (195 words)

SmartPedia.com - Free Online Encyclopedia - Encyclopedia Books. It is used to demonstrate the motion of the stars around the Earth. Its name comes from the latin armilla (circle, bracelet),since it has a skeleton made of graduated metal circles linking the poles and representing the equator, the ecliptic, meridians and parallels. Their development led to many improvements in techniquesand design of all mechanical devices. www.smartpedia.com /smart/browse/Equatorial_armillary_sphere   (195 words)

Equatorial Guinea In the three banners were appearing three colonel stars that was the grade that president Obiang had in the army (in the Spanish army I suppose, since he obtained his title in Spain). Some time ago (1986) the presidency of the Equatorial Guinea requested a creation of a presidential standart. I don't know if anyone was elected because the relations between Spain and Equatorial Guinea were cooled afterwards. www.crwflags.com /fotw/flags/gq_pres.html   (166 words)

SuperEagles.com : Story list SHOOTING Stars Football Club of Ibadan (3SC) at the weekend beat Kwara United FC at the Lekan Salami Stadium in Ibadan to keep alive hopes of picking a continental ticket at the end of the season, as the team moved to fifth position on the table with 46 points. TEAM manager of Wikki Tourists FC of Bauchi, Elder Bisi Rowland, believes in the ability of his boys to mix it with the big boys, a belief which gives him confidence that they can defeat Africa's number one team, Enyimba of Aba. NFA chairman, Ibrahim Galadima, has described the administrative bungle that led to national coach Christian Chukwu's failure to vote for Austin Okocha in the CAF African Footballer of the Year awards as "an embarrassment to the nation" and said the NFA is investigating the issue with a view to bringing whoever is responsible to book. www.supereagles.com /stories/storylist.asp?View=All   (14676 words)

The 50 Brightest Stars Cosmobrain Bright Star Catalog Stars are listed in the order of decreasing visual magnitude. It is intended for use as a source of some basic astronomical and astrophysical data for the 50 brightest stars visible from Earth. For each star, this table contains the proper name, Bayer and/or Flamsteed name, visual apparent magnitude, distance in light years, accuracy of the distance in per cent, absolute magnitude, spectral types, equatorial coordinates for J2000.0 and Hipparcos catalog number. www.cosmobrain.com /cosmobrain/res/brightstar.html   (195 words)

Matrix Astrology Software : Learn Astrology - Visual Astrology - Declination and Latitude Now the interesting fact about the relation between geographic latitude and declination in the equatorial sphere is that there exists a circle of stars on the celestial sphere located at a declination that matches the geographic latitude of your home. This circle of declination and the stars at 42° of declination are the only stars that ever pass directly (by zenith transit) overhead your town. Every city on Earth could be described in terms of the kind of stars and other objects that make up the declination circles that equal the circle of geographic latitude at which they are located. www.thenewage.com /resources/vastrology/eqsys.asp?orig=I2   (741 words)

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