Messier 89Messier 89, also known as M89 and NGC 4552, was discovered by Charles Messier on March 18,1781. M89 is in the constellation Virgo. It has been investigated by long exposure photography by David Malin. It is an elliptical galaxy, and believed to have a black hole. [1] Messier 89 galaxy is 60 million light years away. There is not much information to be found for M89, so the last two links are picture sources only.

Messier's original description of M89

March 18, 1781:
`Nebula without star, in Virgo, a little of distance from and on the same parallel as the nebula reported above, No. 87. Its light was extremely faint and pale, and and it is not without difficulty that one can distinguish it.'[2]



Universe Today

universe today.jpg
Photo credit from Universe Today. The picture is describing that M89 has a black hole.
OVERVIEW - This site provides facts about M89, including the discovery of the galaxy, and characteristics that make it stand out.

AUTHOR - Tammy Plotner

LAST UPDATED - 12/21/2009

DATE REVIEWED - 5/14/2012

REVIEWED BY: Kayla Hopper.

ACCURACY:The information seems reliable, as the author writes in great detail, not just stating facts. She describes all of her information in paragraph form, and often cites her own sources as she is writing.
READABILITY and CLARITY: The text starts off with basic facts, but than it does get more complex to read. The text received a 10.5, so the audience is typically for 10th graders, making it a little higher to understand. You will need background information on basic topics of astronomy in order to understand what the author is saying.

EASE OF NAVIGATION:There is only one page of information, so no need to look for other pages for more information.



SEDS


SEDS.jpg
Photo credit from SEDS. M89 has a brightness of 9.8 magnitude.
OVERVIEWThis is the site I got my information from for the summary at the top of this wiki. Gives basic information, like that the M89 is part of the constellation Virgo, and

that it has been investigated by long exposure photography by David Malin.

AUTHOR - Hartmut Frommert & Christine Kronberg

LAST UPDATED - 9/2/2007

DATE REVIEWED - 5/14/2012

REVIEWED BY: Kayla Hopper.

ACCURACY:This website has quick facts, but they cite their sources, so I feel it is credible information. Information is short, but good for a quick read on M89.

READABILITY and CLARITY: According to Microsoft Word the website got a 12.5, but I felt the website was pretty easy to understand. Useful information that anyone could understand. Breaks down information well by describing what they are talking about with simple wording.

EASE OF NAVIGATION:The website has basic information on one page, then provides external links at the bottom that you can use for more research. Easy to navigate through.


Astro Pixels

astropixels.jpg
Photo credit to Astro Pixels. Photo taken on April 23, 2011 from a Takahashi Epsilon 180 Hyperbolic Astrograph telescope and a Canon EOS 550D camera.
OVERVIEW - Provides Messier's original description of M89:
March 18, 1781:
'Nebula without star, in Virgo, a little of distance from and on the same parallel as the nebula reported above, No. 87. Its light was extremely faint and pale, and and it is not without difficulty that one can distinguish it.' Also provides information on how far the galaxy is from our planet, which is 60 million light years away.
AUTHOR - Fred Espenak

LAST UPDATED - 6/29/2011

DATE REVIEWED - 5/14/2012

REVIEWED BY: Kayla Hopper.

ACCURACY:The information seems to be reliable, as the information has been backed up by other websites. The information got a 11.7 grade level, but with basic understanding of astronomy language, you should be able to understand what the information is. Website has also been copyrighted since 1970. Information has been updated recently also.

READABILITY and CLARITY: The audience will be able to read and gain knowledge easily with the wording the author uses, and also the way the website is simple and gives information with not too big of vocabulary.

EASE OF NAVIGATION: Only one page of information, giving you the information easily.



Wiki Sky
wikisky.jpeg
Photo credit from Wiki Sky. M89 is the bright white circle towards the bottom half on the picture.
OVERVIEW - Provides a couple observations of M89.

AUTHOR - Unknown

LAST UPDATED - Unknown

DATE REVIEWED - 5/14/2012

REVIEWED BY: Kayla Hopper.

ACCURACY:There is no information about the author, or how the pictures were taken. The only way I have an idea of this website being legit is because of my previous research. Has interesting pictures to take a look at, but no information to read on..

READABILITY and CLARITY: There is only pictures, so nothing to judge how clear it is.

Easy to navigate, it does only have a few pictures :)


Photo of M89 by Sid Leach

sidleach.jpg
Photo credit from Sid Leach. See link above.
OVERVIEW - Provides one picture of M89.

AUTHOR - Sid Leach

LAST UPDATED - Unknown

DATE REVIEWED - 5/14/2012

REVIEWED BY: Kayla Hopper.

ACCURACY:Only one picture of M89, but it is a clear picture.

READABILITY and CLARITY: There is only one picture, and with previous research it looks like M89, so I believe this is a good, clear picture of the galaxy.

Since it is only one picture, no navigation needed.
  1. ^


    http://messier.seds.org/m/m089.html
  2. ^


    http://www.astropixels.com/galaxies/M89-01.html