exoplanet observing for amateurs
... Billions upon billions of planets must exist! This is the message from the tally of 248 extra-solar planetary systems (as of mid-2007). Among them are 22 exoplanets that transit in front of their star (15 that are brighter than 13th magnitude), and the number is growing so fast that by the time this ...
... Billions upon billions of planets must exist! This is the message from the tally of 248 extra-solar planetary systems (as of mid-2007). Among them are 22 exoplanets that transit in front of their star (15 that are brighter than 13th magnitude), and the number is growing so fast that by the time this ...
Astronomers` Observing Guides
... Double and Multiple Stars Defined We begin this volume on viewing double and multiple stars by defining just what they are: two or more suns placed in close proximity to each other in the sky as seen with the unaided eye, binoculars or telescopes. With the exception of stars that just happen to lie al ...
... Double and Multiple Stars Defined We begin this volume on viewing double and multiple stars by defining just what they are: two or more suns placed in close proximity to each other in the sky as seen with the unaided eye, binoculars or telescopes. With the exception of stars that just happen to lie al ...
Properties of White Dwarfs, Teacher Guide
... that to our Sun at 5,770 Kelvin, and you understand why these objects when first discovered were called “white”. They are very hot. But what about “dwarf”? Based on Bessel’s calculations for Sirius’s companion, astronomers were able to find Sirius B and measure its apparent brightness (magnitude), w ...
... that to our Sun at 5,770 Kelvin, and you understand why these objects when first discovered were called “white”. They are very hot. But what about “dwarf”? Based on Bessel’s calculations for Sirius’s companion, astronomers were able to find Sirius B and measure its apparent brightness (magnitude), w ...
Hunting for Substructure in the Milky Way
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
On the nature of sn stars. I. A detailed abundance study
... Ae/Be star, but with a rotational velocity of only 20 km/s. Further studies are needed to confirm the real nature of this interesting object, which is a candidate to be a shell star with a low rotational velocity. There are several fundamental questions about the group of sn stars. Previous works su ...
... Ae/Be star, but with a rotational velocity of only 20 km/s. Further studies are needed to confirm the real nature of this interesting object, which is a candidate to be a shell star with a low rotational velocity. There are several fundamental questions about the group of sn stars. Previous works su ...
to - NexStar Resource Site
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances. k-means clustering analysis was used to group the stars in ω Cen into four homogeneous groups based upon these ...
... oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances. k-means clustering analysis was used to group the stars in ω Cen into four homogeneous groups based upon these ...
The Norma cluster (ACO3627) – II. The near-infrared Ks
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
Stellarium User Guide
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
- National Optical Astronomy Observatory
... magnetic field lines unless there was an indirect mechanism for their flow, namely, other materials that are directed by the magnetic field. The data seems to indicate that the mechanism for the nickel’s movement is not the flow of iron directed by the magnetic fields. The nickel displays greater va ...
... magnetic field lines unless there was an indirect mechanism for their flow, namely, other materials that are directed by the magnetic field. The data seems to indicate that the mechanism for the nickel’s movement is not the flow of iron directed by the magnetic fields. The nickel displays greater va ...
Binarity in carbon-enhanced metal-poor stars
... these variations are comparable to the observational uncertainties in the case of BD +44-493. Radial velocity data for eight more stars have in the meantime been added (Hansen, Andersen & Nordtröm 2012, also see Andersen et al. in preparation). They find that two out of their sample of eight CEMP-n ...
... these variations are comparable to the observational uncertainties in the case of BD +44-493. Radial velocity data for eight more stars have in the meantime been added (Hansen, Andersen & Nordtröm 2012, also see Andersen et al. in preparation). They find that two out of their sample of eight CEMP-n ...
Altas Farnese
... near the north pole (cf. Section A.2.2). (7) The ecliptic crosses the equator 5° west of the colure lines. This arrangement is wrong by definition, as precession moves the sky along the ecliptic, suggesting that the sculptor made the change because of his lack of astronomical knowledge. (8) The stri ...
... near the north pole (cf. Section A.2.2). (7) The ecliptic crosses the equator 5° west of the colure lines. This arrangement is wrong by definition, as precession moves the sky along the ecliptic, suggesting that the sculptor made the change because of his lack of astronomical knowledge. (8) The stri ...
Classification of Variable Stars
... exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignments are made in the order in which the variable stars were discovered in a constellation. If one o ...
... exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignments are made in the order in which the variable stars were discovered in a constellation. If one o ...
Chap 16: Galaxies
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
... Starburst galaxies contain many young stars and recent supernovae, and are often very rich in gas and dust; bright in infrared: ultraluminous infrared galaxies ...
(a) Mean solar time
... These are of Greek, Latin or (especially) Arabic origin, and are still commonly used for ~50 brightest stars (northern, equatorial stars). e.g. Canopus, Sirius, Procyon, Aldeberan. ...
... These are of Greek, Latin or (especially) Arabic origin, and are still commonly used for ~50 brightest stars (northern, equatorial stars). e.g. Canopus, Sirius, Procyon, Aldeberan. ...
3-1
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
... B. 0.6 + 0.008 + 0.0007 Standard form: 0.6087 Word form: six thousand eighty-seven tenthousandths Course 1 ...
ancient cultures 114 - Stellenbosch University
... astronomical texts, known as astrolabes, had already appeared – texts which made use of astronomical observations to serve calendar functions. During the Neo-Assyrian period (9th-7th centuries BCE), individual scholars were tasked to observing the heavens in order to make predictions of the future f ...
... astronomical texts, known as astrolabes, had already appeared – texts which made use of astronomical observations to serve calendar functions. During the Neo-Assyrian period (9th-7th centuries BCE), individual scholars were tasked to observing the heavens in order to make predictions of the future f ...
Article PDF - IOPscience
... these few clusters may not necessarily be representative of the entire GC ensemble of M31, still they allowed us to check for the first time whether the properties of the RRL stars in the M31 GCs are compatible with the Oosterhoff dichotomy, and whether they show the same correlations with HB morpho ...
... these few clusters may not necessarily be representative of the entire GC ensemble of M31, still they allowed us to check for the first time whether the properties of the RRL stars in the M31 GCs are compatible with the Oosterhoff dichotomy, and whether they show the same correlations with HB morpho ...
WILLIAM HERSCHEL AND THE `GARNET` STARS: μ CEPHEI AND
... this famous red star is not well documented. Prior to and after Herschel, the identification of this star was the subject of confusion in various catalogues and atlases. The case is complex and involves other stars in southern Cepheus, including double stars, found by Herschel in the course of his s ...
... this famous red star is not well documented. Prior to and after Herschel, the identification of this star was the subject of confusion in various catalogues and atlases. The case is complex and involves other stars in southern Cepheus, including double stars, found by Herschel in the course of his s ...
Asteroid Rotation Periods
... of a magnitude have been used. Even higher precision can be used, but this is not justified for measurements made by the eye alone, since the accuracy is about ½mag, and this is why the magnitude scale at first had only integer values. However today with the use of electronic sensors it is possible ...
... of a magnitude have been used. Even higher precision can be used, but this is not justified for measurements made by the eye alone, since the accuracy is about ½mag, and this is why the magnitude scale at first had only integer values. However today with the use of electronic sensors it is possible ...
April 2015 Astronomy Calendar by Dave Mitsky
... Mercury, Venus, and Mars are located in the west and Jupiter in the south in the evening. At midnight, Jupiter is in the west, and Saturn is in the southeast. Saturn can be found in the southwest and Uranus and Neptune in the east in the morning sky. At midmonth, Venus sets at 11:00 p.m., Mars sets ...
... Mercury, Venus, and Mars are located in the west and Jupiter in the south in the evening. At midnight, Jupiter is in the west, and Saturn is in the southeast. Saturn can be found in the southwest and Uranus and Neptune in the east in the morning sky. At midmonth, Venus sets at 11:00 p.m., Mars sets ...
Nebulae.The Lagoon and Dumbbell Nebulae
... a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap aroun ...
... a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these stars usually turn into red giants. They lose their mass by ejection of the outer gas layers. These layers expand in space, forming a temporary wrap aroun ...
Brightest Stars : Discovering the Universe Through the Sky`s Most
... The concept and term that astronomers use most often to measure brightness is magnitude. The term was first applied to the brightness of stars by the ancient Greek astronomer Hipparchus (c. 120 BC). Hipparchus recognized six classes of star brightness. The brightest stars were said to be “first magn ...
... The concept and term that astronomers use most often to measure brightness is magnitude. The term was first applied to the brightness of stars by the ancient Greek astronomer Hipparchus (c. 120 BC). Hipparchus recognized six classes of star brightness. The brightest stars were said to be “first magn ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... found and predicted among BHB stars if modest mass loss is assumed. Among populations of solar metallicity or higher, only HB stars redder than the RR Lyrae instability strip should be produced within a Hubble time. However, the most metal-rich globular clusters in the Galaxy, such as NGC 6388 and N ...
... found and predicted among BHB stars if modest mass loss is assumed. Among populations of solar metallicity or higher, only HB stars redder than the RR Lyrae instability strip should be produced within a Hubble time. However, the most metal-rich globular clusters in the Galaxy, such as NGC 6388 and N ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.