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Introduction to Hydra

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Braedon Savage

on 2 October 2014

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Transcript of Introduction to Hydra

Introduction to Hydra the Sea Serpent
Best Time to See the Constellation:

The best time of year for Hydra to be seen is in March and April, though
alpha Hydrae
, its brightest star, transits on February 12 (Dibon-Smith).

Star Charts

Right Ascension:

between +54° and -83°.
(Constellation Guide)
Introduction to Hydra the Sea Serpent
The myth of Hydra goes as follows. In Greek mythology, Hydra was a serpent-like creature that had nine heads, but one was immortal which made the whole beast immortal. The beast was terrorizing villages near its lair so the mighty Hercules was tasked with slaying the beast. In a raging fight with the creature, Hercules cut off one of its heads just to see more grow in its place. Finally, the hero was able to decapitate Hydra of its immortal head (with the assistance of another person names Iolaus), killing the beast (Dibon-Smith).
Space Objects in Hydra
Hydra contains three objects called
Messier objects

Messier 48
(Also know as M48 or NGC 2548) is a galactic cluster within the Hydra Constellation. This object was discovered in 1771 by Charles Messier. Fact: There is no cluster in the location given by Messier as he was off on his declination measurement by five degrees. This cluster of stars is said to be about 300 million years old and can be seen with the naked eye (Plotner).


(Also know as M68, NGC 4590) (Plotner).
Neighbouring Constellations:
Corvus, Cancer, Libra, Antlia, Sextans, Canis Minor, Virgo, Centaurus, Pyxis, Leo, Puppis, Monoceros, and Lupus (Constellation Guide).

Hydra Constellation Model
Messier 83
(Also know as Southern Pinwheel Galaxy, M83 or NGC 5236) is a barred spiral galaxy situated in Hydra. This galaxy was discovered by Nicholas Louis de Lecaille in 1752. M83 was the third of all galaxies to be discoveredafter M31 and M32 and the first to be discovered beyond the Local Group. This galaxy can be seen better in the southern deep sky than in the mid-northern sky for its location. M83 is also said to be on of the brightest galaxies (Frommert).
Space Objects in Hydra
Space Objects in Hydra
NGC 5694
- A compact globular star cluster discovered by William Hershel in 1794. It is slightly east of the mid-way point between
sigma Librae
pi Hydrae
. This cluster is estimated to be 100,000 light years away from the sun. It is considered one of the more remote global clusters of our Galaxy.(Escaping Globular).

NGC 5694 appears to be moving so quickly that it is bound to escape our Galaxy at some point in the future (Escaping Globular).
NGC 5694
Space Objects in Hydra
NGC 3242
- Small, bright planetary nebula with a visual magnitude of 8.6. It is often referred to as The Ghost of Jupiter as it closely resembles that planet. This nebula emits a slight bluish glow. The central star is a blue dwarf estimated to be as hot as 60,000 kelvin (Dibon-Smith).
NGC 3242
Zoom out to see a model of Hydra made out of the Prezi circles.
Interesting Facts
Hydra is the largest of all 88 constellations spanning an area of 1303 square degrees in the night sky (Constellation Guide).
"Alphard is a bright giant, about 25 times the Sun's diameter. Its distance is 89 light years, and it has a luminosity of 95 Suns" (Dibon-Smith).

The constellation was first noted in the 2nd century by the Greek astronomer Ptolemy (Constellation Guide).
Hydra is located the second quadrant of the southern hemisphere.
(Constellation Guide)
The Alpha Hydrids and the Sigma Hydrids are two meteor showers that are associated with Hydra (Constellation Guide).

"Alphard is a bright giant, about 25 times the Sun's diameter. Its distance is 89 light years, and it has a luminosity of 95 Suns" (Dibon-Smith).
Star Charts
Interesting Facts
Astronomy Picture of the Day. (n.d.). APOD: March 31, 1997. Retrieved October 1, 2014, from http://apod.nasa.gov/apod/ap970331.html

Dibon-Smith, R. (n.d.). Hydra. Dibon Smith. Retrieved October 1, 2014, from http://dibonsmith.com/hya_con.htm

Frommert, H. (2009, March 9). Messier 83. Messier Object 83. Retrieved October 1, 2014, from http://messier.seds.org/m/m083.html

Hydra. (n.d.). Constellations: The Sea Serpent. Retrieved October 1, 2014, from http://www.windows2universe.org/the_universe/Constellations/spring/hydra.html

Hydra Constellation. (n.d.). Constellation Guide. Retrieved September 29, 2014, from http://www.constellation-guide.com/constellation-list/hydra-constellation/

NGC 5694. (n.d.). NGC 5694. Retrieved October 1, 2014, from http://spider.seds.org/spider/MWGC/Dss/dsn5694.html

NGC 5694 Escaping Globular. (n.d.). NGC 5694 Escaping Globular. Retrieved October 1, 2014, from http://www.poyntsource.com/Richard/ngc_5694_escaping_globular.htm

Plotner, T. (2009, July 18). Messier 48. Universe Today. Retrieved October 1, 2014, from http://www.universetoday.com/35202/messier-48/

Plotner, T. (2009, August 18). Messier 68. Universe Today. Retrieved October 1, 2014, from http://www.universetoday.com/37724/messier-68/

Hydra, a Constellation for Autumn. (n.d.). Hydra, a Constellation for Autumn. Retrieved October 1, 2014, from http://www.rasnz.org.nz/Stars/Hydra.htm

Bibliography (Including Images)
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