... In 1930, Trumpler noticed that linear diameters (LD) of open clusters increase with distance (D) from the Sun. ... Since that time, the interstellar absorption has become one of the best studied factor in astrophysics, and we may hope that current OCL distance scales are free from this LD-D correlation. To verify if this is the case we have chosen several modern OCL distance scales and test them with the same clusters and the same angular diameters that Trumpler had used back in 1930. ...

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9th of April 2015 . Update on HI data collection from GBT, Parkes and Arecibo telescopes . for the Cosmic Flows project . by Helene Courtois (University of Lyon) . Cosmic Flows is an international multi-element project with the goal to map motions of galaxies in the Local Universe. ... This paper gathers additional observational radio data, frequently unpublished, retrieved from the archives of Green Bank, Parkes and Arecibo telescopes. ... today * ATNF | Parkes | ...

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• The Fresnel distance
• Distances
• Ionized Hydrogen at Large Galactocentric Distances

... Home Education Classes AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . ... Classes . AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . AAA Spring Astronomy Class: The Physics of Astronomy тАУ February - March 2016 . ... This MonthтАЩs Sky тАУ April 2016 . ... Dec. ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ...

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STScI . ... What is STScI . ... Staff Directory . ... Missions . HST . ... Future Missions and . ... Missions Office . ... Research . Research Staff Directory . ... Talks . ... Local Attractions . ... More than two decades ago the distance scale was uncertain by a factor of two, and the resolution of this conundrum had been a major driver for HST. ... Space permitting, workshop talks are open to faculty and staff from all local (Maryland Washington DC) institutions without registering. ...

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• Extragalactic Cepheid Distances by Calibrated Period - Luminosity-Color

Hipparchus (and possibly Aristarchus before him) also derived the Moon's distance from the duration of a lunar eclipse . Because the Earth casts a much larger shadow than the Moon, such an eclipse usually darkens the entire Moon, for several hours. ... If the Sun is assumed to be very distant, and if the Moon crosses the middle of the shadow (if not, corrections must be made), the width of the shadow is expected to be about 2r , twice the Earth's radius r . ... Last updated 4 February 1999 Moon. ...

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• Distance to the Horizon
• Parallax
• SIMP > physical > currents > ers0009050149

... Stromlo Reconstruction . ... burn-off, eastern slope of Stromlo with lightтАж . ... Title: burn-off, eastern slope of Stromlo with lights of Canberra in distance, Oct 2004 . ...

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• How far away is Virgo?
• Duffield collection
• The High-Z SN Search Description

. Next: Diameters Up: Derived parameters Previous: Absolute magnitudes Contents . d_stars Compute distance D from parallax, absolute magnitude, or both. Christian Hummel 2015-04-28

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• Paranal Observatory seen from the distance
• Snow line distance compared to the Solar System
• ESO - The Scisoft Software Collection

... In this paper we present the results of detailed B, V, R, I, and H study of the isolated nearby blue compact dwarf (BCD) galaxy NGC6789. Judging from the literature the observed galaxy has not been resolved into stars up to now. ... The distance of the galaxy, estimated from the tip of the red giant branch (TRGB) is 2.1 Mpc which places NGC6789 close to the Local Group. ... Key words: nearby galaxies: dwarf galaxies (NGC 6789): distance moduli: star content . ... Distance. ...

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Compilation of distance measurements . HyperLeda home | Documentation | Search by name | Search near a position | ... SQL Search | Search an object in the distance catalogue . This catalog (table a007 in the database) presents the compilation of published distance mesurements using photometric distance indicators. Photometric modulus. Error of modulus measurement. The method used to determine the distance is coded for each measurement as follow: . HyperLeda . ...

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• HyperLEDA documentation: (distance_method_codes) method codes for distance
• HyperLEDA documentation: (auxdistance) auxiliary table for distance catalog
• Determine H0 using a SQL query to LEDA

... The absolute magnitude of the RCBs in the LMC and the small number of Galactic RCBs implies that they are very rare stars. Together with statistics for related stars, the total number of hydrogen-deficient stars in the Galaxy is estimated to be about 1000. Whilst the luminosity of RCBs is similar to that of other low-mass stars as they evolve rapidly from the asymptotic RED GIANT branch to become WHITE DWARFS , their frequency is much lower. ...

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• Index of /archives/ArmaghObservatory/collections/HARDCASTLE COLLECTION/MET
• Index of /archives/collections/HARDCASTLE COLLECTION/MET RECORDS
• Index of /archives/collections M41

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The AstroGuide . ... AstroGuide | ... AstroGuide Listing . Login . See many more Astronomy Listings by: Category or Alphabet . ... Last Update July 27, 2006 . Listed Since July 15, 1998 . ... Web Site . http://janus.astro.umd.edu/astro/distance/ . ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

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• Sovietski Collection, AstroGuide Listing
• The Universe Collection, AstroGuide Listing
• Shifts Are As Would Be Expected. - an Astronomy Net Blackholes2 Forum Message

. Distance Conversion Calculator . by Matt Oltersdorf 2000 04 02 2225 UTC . Type the known value into the appropriate units field, click the . calculate button and the program will show all values for . related unit properties. Kilometers . Meters . mm . Inches . Feet . Yards . Miles . Astronomical Units (A.U.) . Light Year (LY) . Parsec (pc) . Kilometers . Miles .

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... Asteroids in the Distance . ... Credit Copyright: R. Evans K. Stapelfeldt ( JPL ), WFPC2 , HST , NASA Explanation: Rocks from space hit Earth every day. ... Many kilograms of space dust pitter to Earth daily. ... In 2002 June , the small 100-meter asteroid 2002 MN was discovered only after it whizzed by the Earth, passing well within the orbit of the Moon. ... Publications with keywords: asteroid - distance . Publications with words: asteroid - distance . ... Asteroid 2005 YU55 Passes the Earth . ...

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• Астронет > Asteroids in the Distance

The accurange 3000 distomat was borrowed to evaluate it as a replacement for our current distomats. ... accurange 3000 users manual (.pdf) . ... 28apr11: distance measurements for different sample averages . ... On 28apr11 distance measurements were made with the accurange 3000 distomat. ... Page 1: accurange 3000 distance vs time for 4 sample averages. ... Page 5: accurange 3000 temperate during measurements. the temperature measured for each measurent is plotted. there is no obvious dependencies. ...

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• HVC Distances
• The Search for HVCs in Other Galaxies
• trelectronics distomat