of the outer planets are gas
... This planet is about 4 times the size of Earth (which makes it one of the smaller gas giants) and 19 times farther from the sun, relative to Earth. The surface of this planet is made up of clouds of blue-green ice crystals of methane and rock. This gas giant has a retrograde rotation. It is one of t ...
... This planet is about 4 times the size of Earth (which makes it one of the smaller gas giants) and 19 times farther from the sun, relative to Earth. The surface of this planet is made up of clouds of blue-green ice crystals of methane and rock. This gas giant has a retrograde rotation. It is one of t ...
PH607 – Galaxies
... billion (109) years, which is nearly as old as the Universe itself. This estimate is based on Very Large Telescope measurements of the beryllium content of two stars in globular cluster NGC 6397. This allowed astronomers to deduce the elapsed time between the rise of the first generation of stars in ...
... billion (109) years, which is nearly as old as the Universe itself. This estimate is based on Very Large Telescope measurements of the beryllium content of two stars in globular cluster NGC 6397. This allowed astronomers to deduce the elapsed time between the rise of the first generation of stars in ...
The Ultraluminous X-ray Source in Holmberg IX and its Environment
... IX, a dwarf galaxy near M81. The ULX has an average X-ray luminosity of some 1040 erg/s. It is located in a huge (400pc × 300pc) ionized nebula being much larger than normal supernova remnants. From the observed emission lines (widths and ratios) we find that the structure is due to collisional excit ...
... IX, a dwarf galaxy near M81. The ULX has an average X-ray luminosity of some 1040 erg/s. It is located in a huge (400pc × 300pc) ionized nebula being much larger than normal supernova remnants. From the observed emission lines (widths and ratios) we find that the structure is due to collisional excit ...
A report of the SEEDS Direct Imaging Survey
... □ SEEDS has explored the wide-orbit giant planets of the Solar system scale. As a systematic survey, SEEDS has been most successful in direct imaging of planets. □ From SEEDS, 3 direct imaging discovery of planets and boundary-mass-objects (GJ 504 b, κ And b, GJ 758 b) and 3 brown dwarfs detection i ...
... □ SEEDS has explored the wide-orbit giant planets of the Solar system scale. As a systematic survey, SEEDS has been most successful in direct imaging of planets. □ From SEEDS, 3 direct imaging discovery of planets and boundary-mass-objects (GJ 504 b, κ And b, GJ 758 b) and 3 brown dwarfs detection i ...
spectral lines as distant measurement tools
... dwarfs than giants — but it is likely that many more white dwarfs exist than we observe. The multiple locations per column imply that another parameter than only the spectral type is needed to define a star, which Annie Cannon and colleagues called the “luminosity classification” I–II–III–IV–V. Star ...
... dwarfs than giants — but it is likely that many more white dwarfs exist than we observe. The multiple locations per column imply that another parameter than only the spectral type is needed to define a star, which Annie Cannon and colleagues called the “luminosity classification” I–II–III–IV–V. Star ...
Ch 11a (Measuring Stars 10-28-10)
... Distance: If you know the parallax “p” (in arcseconds) you can calculate the distance “d” (in parsecs) d=1/p (1parsec= 3.26 lightyears) Apparent brightness: how bright a star looks in the sky The inverse-square Law: light from stars gets fainter as the inverse square of the distance (apparent bri ...
... Distance: If you know the parallax “p” (in arcseconds) you can calculate the distance “d” (in parsecs) d=1/p (1parsec= 3.26 lightyears) Apparent brightness: how bright a star looks in the sky The inverse-square Law: light from stars gets fainter as the inverse square of the distance (apparent bri ...
How Stars Work: Ay 122 - Fall 2004 - Lecture 7
... In the central regions of stars, OK to assume that all the elements are fully ionized. Denote abundances of different elements per unit mass by: • X hydrogen - mass mH, one electron • Y helium - mass 4mH, two electrons • Z the rest, `metals’, average mass AmH, approximately ...
... In the central regions of stars, OK to assume that all the elements are fully ionized. Denote abundances of different elements per unit mass by: • X hydrogen - mass mH, one electron • Y helium - mass 4mH, two electrons • Z the rest, `metals’, average mass AmH, approximately ...
Outline of Lecture on Copernican Revolution: 5b: So, what was
... Outline of Lecture on Copernican Revolution: 5c: How did Copernicus address these flaws of Ptolemy’s model? He replaced the non-uniform motion of the guiding center of Ptolemy’s epicycle about its circular orbit with uniform motion about a circle and uniform motion about a small epicycle. He elimina ...
... Outline of Lecture on Copernican Revolution: 5c: How did Copernicus address these flaws of Ptolemy’s model? He replaced the non-uniform motion of the guiding center of Ptolemy’s epicycle about its circular orbit with uniform motion about a circle and uniform motion about a small epicycle. He elimina ...
Jupiter`s Radio Signals
... 5PM 1700HRS 187ºAZ 47ºEL 6PM 1800HRS 207ºAZ 44ºEL 7PM 1900HRS 225ºAZ 37ºEL 8PM 2000HRS 239ºAZ 28ºEL 9PM 2100HRS 251ºAZ 17ºEL 10PM 2200HRS 261ºAZ 6.5ºEL 10:30PM 22300HRS 266ºAZ 0ºEL Viewing works only on clear cloudless nights. 9PM(2010)=227ºAZ and 9PM(2011)= 251ºAZ Jupiter moved only 24ºAZimuth (17º ...
... 5PM 1700HRS 187ºAZ 47ºEL 6PM 1800HRS 207ºAZ 44ºEL 7PM 1900HRS 225ºAZ 37ºEL 8PM 2000HRS 239ºAZ 28ºEL 9PM 2100HRS 251ºAZ 17ºEL 10PM 2200HRS 261ºAZ 6.5ºEL 10:30PM 22300HRS 266ºAZ 0ºEL Viewing works only on clear cloudless nights. 9PM(2010)=227ºAZ and 9PM(2011)= 251ºAZ Jupiter moved only 24ºAZimuth (17º ...
First firm spectral classification of an early-B PMS star
... (up to ∼ 10−3 M¯ yr−1 , Hosokawa et al. 2010) to ensure that the star does not leave the main sequence before the accretion process has finished. Evidence of accretion must come from the detection of circumstellar disks and bipolar jets, as observed around forming low-mass stars (e.g., Appenzeller & ...
... (up to ∼ 10−3 M¯ yr−1 , Hosokawa et al. 2010) to ensure that the star does not leave the main sequence before the accretion process has finished. Evidence of accretion must come from the detection of circumstellar disks and bipolar jets, as observed around forming low-mass stars (e.g., Appenzeller & ...
Lecture 10 Spectra of Stars and Binaries
... • Visible Hydrogen absorpZon lines come from the second excited state. • B Stars (15‐30,000 K): Most of H is ionized, so only very weak H lines. • A Stars (10,000 K): Ideal excitaZon condiZons, strongest H lines. ...
... • Visible Hydrogen absorpZon lines come from the second excited state. • B Stars (15‐30,000 K): Most of H is ionized, so only very weak H lines. • A Stars (10,000 K): Ideal excitaZon condiZons, strongest H lines. ...
Black-Body SNR Formulation of Astronomical Camera
... nm in Figure 3-b at 10000K. From the figure, it is clear that different bandwidths achieve their peak at different intervals with a trend that favors smaller starting wavelengths as the bandwidth increases. This is an important fact to be aware of when designing detectors to visualize stars with spe ...
... nm in Figure 3-b at 10000K. From the figure, it is clear that different bandwidths achieve their peak at different intervals with a trend that favors smaller starting wavelengths as the bandwidth increases. This is an important fact to be aware of when designing detectors to visualize stars with spe ...
astro mental - Unleash Your Dreams
... You then take a business card, piece of paper, billet and write down one of the two possibilities. Do not let your spectators see what you write. Look deep into your spectator’s eyes and call out the star sign that is not written down. If the spectator says “Yes!” simply, put the card away. If the s ...
... You then take a business card, piece of paper, billet and write down one of the two possibilities. Do not let your spectators see what you write. Look deep into your spectator’s eyes and call out the star sign that is not written down. If the spectator says “Yes!” simply, put the card away. If the s ...
The Spring Night Sky – March, April and May All data sourced from
... South – Leo and Virgo are well placed for viewing – Saturn is easily found within the body of Virgo – near the bright star Spica – alpha Virginis. Cancer is to the top RHS of Leo. West – Ursa Major is high up with Gemini still visible – but Orion is now setting Meteor Showers There is the April Lyri ...
... South – Leo and Virgo are well placed for viewing – Saturn is easily found within the body of Virgo – near the bright star Spica – alpha Virginis. Cancer is to the top RHS of Leo. West – Ursa Major is high up with Gemini still visible – but Orion is now setting Meteor Showers There is the April Lyri ...
JaiminiCharaDasasand.. - Saptarishis Astrology
... Andhra Pradesh area of India, but its governing principles are also discussed in detail in the encyclopedic compendium of astrological techniques, the Brihat Parasara Hora Sastra. The BPHS has enough material in it to keep most of us studying Jyotisha busy for several life times. The Jaimini factors ...
... Andhra Pradesh area of India, but its governing principles are also discussed in detail in the encyclopedic compendium of astrological techniques, the Brihat Parasara Hora Sastra. The BPHS has enough material in it to keep most of us studying Jyotisha busy for several life times. The Jaimini factors ...
fred`s 2017 astronomy challenge
... How to find: Never finding itself very high in the sky, and only properly visible at sunrise or sunset, Mercury is the closest planet to our Sun. However, don’t be fooled that ...
... How to find: Never finding itself very high in the sky, and only properly visible at sunrise or sunset, Mercury is the closest planet to our Sun. However, don’t be fooled that ...
Theory of Massive Star Formation
... cores the right mass and size to be the progenitors of massive stars: M ~ 100 M, R < 0.1 pc, Σ ~ 1 g cm‐2 Core in IRDC 18223‐3 in mid‐IR (Spitzer, color) and mm (Plateau de Bure Interferometer, contours), (Beuther+ 2005) ...
... cores the right mass and size to be the progenitors of massive stars: M ~ 100 M, R < 0.1 pc, Σ ~ 1 g cm‐2 Core in IRDC 18223‐3 in mid‐IR (Spitzer, color) and mm (Plateau de Bure Interferometer, contours), (Beuther+ 2005) ...
Chapter 20
... 12.1b The Birth Cries of Stars The jets of gas were formed as the pre-main-sequence star contracted under the force of its own gravity. Because a thick disk of cool gas and dust surrounds the premainsequence star, the gas squirts outward along the pre-main-sequence star’s axis of rotation at speeds ...
... 12.1b The Birth Cries of Stars The jets of gas were formed as the pre-main-sequence star contracted under the force of its own gravity. Because a thick disk of cool gas and dust surrounds the premainsequence star, the gas squirts outward along the pre-main-sequence star’s axis of rotation at speeds ...
Comets
... Comets Kuiper Belt • Like the asteroids in the inner solar system, most Kuiper belt comets move in nearly circular orbits that lie roughly in the same plane as the planets. ...
... Comets Kuiper Belt • Like the asteroids in the inner solar system, most Kuiper belt comets move in nearly circular orbits that lie roughly in the same plane as the planets. ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.