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Q: Need star information ( Answered 4 out of 5 stars,   1 Comment )
Subject: Need star information
Category: Science > Astronomy
Asked by: thewolf1-ga
List Price: $5.00
Posted: 29 Nov 2005 19:24 PST
Expires: 29 Dec 2005 19:24 PST
Question ID: 599258
SAO Star Catalog: 206332 Lupus
Position: Right Ascension 15h 08m 41.46s, Declination -33 56' 57.8"
Type: F8
Magnitude: 8.9
Distance: Unknown

What this mean... Position is OK, I browsed the web for the type, but
it's too complex for me. The magnitude is the brightness I think, but
again I don't really understand.

My question: what can you tell me about this star (from the info above
& more if you can)?
Subject: Re: Need star information
Answered By: answerfinder-ga on 30 Nov 2005 08:48 PST
Rated:4 out of 5 stars
Dear thewolf1-ga, has the SAO Star Catalog. Enter your star number and
your star?s details will come up. There are then links to explanations
on several of the terms used. I have copied them below - read each one
for a full explanation.

The star is located in the constellation Lupus a.k.a. The Wolf
(judging by your ga name you known this already!). It is a
constellation of the southern celestial sphere.

As you know already, the RA is 15h 08m 41.461s and the Decl is -33
56' 57.85" . This explains where the star is in the night sky. An
explanation of these terms appears on this page.

Lupus Constellation

These are other Google references to the constellation Lupus should
you wish to have more information.

Magnitude is the apparent brightness of an object. Strange as it may
seem, the first magnitude is the brightest, while magnitude two is
fainter than one, and so on. Your star is 8.9. You cannot see it with
the naked eye, 6 is often the maximum, but you may be able to observe
it with a good set of binoculars.

Type is also referred to as Spectral class. This is a classification
system for stars. Type F has a surface temperature of between 6,000
and 7,500 K and has a White (yellowish) colour. It is warmer than our
Sun and this type on average is larger and brighter than our Sun. Each
type is then subdivided. Once again, there is quite a detailed
explanation on the page.

?Class F stars are still quite powerful and they are average-sized,
such as Fomalhaut in Pisces Australis. Their spectra is characterized
by the weaker hydrogen lines and ionized metals, their colour is white
with a slight tinge of yellow.?

If you want to learn more about how to classify a star, try this
exercise on Sloan Digital Sky Survey web site.

?F star
A white or yellowish-white star of spectral type F whose spectrum
shows strong absorption lines of ionized calcium which are more
prominent than the hydrogen lines. Moderately strong lines due to iron
and other heavier elements are also in evidence. Main sequence F
stars, of which Procyon is an example, have a surface temperature of
5,800 to 6,900C, a mass of 1.2 to 1.6 solar masses, and a luminosity
of 2 to 6 times that of the Sun. Relatively nearby, late-type members
of this category are generally included in the list of target stars
for extrasolar planet searches and targeted SETI programs. F-type
supergiants, of which Canopus and Polaris (the Pole Star) are
examples, have a mass up to 12 solar masses and a luminosity up to
32,000 times that of the Sun.?

I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
thewolf1-ga rated this answer:4 out of 5 stars
Thanks for the great answer!

Subject: Re: Need star information
From: ansel001-ga on 01 Dec 2005 00:48 PST
The brighter the object, the lower its magnitude.  This does not end
with magnitude 1, but can be zero or negative.  The star Vega has
magnitude zero.  In fact, the magnitude system was originally
calibrated to Vega as magnitude zero, although the modern system has
refined this a little.  Some other magnitudes:

Sirius, the brightest nighttime star:  -1.5
Venus at maximum brightness:  -4.4
Full moon:  -12.6
Sun:  -26.7

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