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Felis

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Felis
Constellations (7)
Cancer, Crater, Hydra, Leo Major, Leo Minor, Lynx, Sextans
Nomenclature
Abbreviation Fel
Genitive Felis
Pronunciation Name: /'fē•lis/
Genitive: /'fē•lis/
Symbolism the cat
Geometry
Midpoint right ascension Template:RA2
Midpoint declination Template:DEC2
Northernmost border Template:DEC2
Southernmost border Template:DEC2
Westernmost border Template:RA2
Easternmost border Template:RA2
Quadrant NQ2
Segments 66
Bordering caelregios Araneus (W)
Avis (N)
Malus (S (W))
Noctua (E)
Simianus (S (E))
Area 4128.935 sq. deg. (6th)
Proportion of the sky 100.088‰
Average constellation area 589.848 sq. deg. (4th)
Stars
Named stars 21
Main stars 5
Naked eye stars
(m < 6.50)
360
BF stars 433
PH stars 61
Known exoplanets 76
Bright stars
(m < 3.00)
7
Brightest star Regulus (1.35m)
Nearby stars
(D < 10.00 pc, 32.62 ly)
7
Nearest star Wolf 359 (2.39 pc, 7.78 ly)
Messier objects 10
Visibility
Full visibility range 54°N–28°S
Partial visibility range 90°N–54°N,
28°S–90°S
Midnight culmination date February 28
Zodiac
Astrological sign 6/22–8/21
Solar sign 7/21–9/15

Felis is a caelregio located in the second quadrant of the northern hemisphere at its midpoint, but it extends into the southern hemisphere and into the third quadrant. Felis is divided into seven constellations (listed in the infobox), including the largest constellation Hydra.

This caelregio contains several notable bright stars, a couple of notable planetary systems, and many examples of galaxies and dwarf galaxies.

Name and symbolism Edit

Felis is directly named after the former constellation where it was located between Antlia and Hydra.

Felis is named after the Latin word for cat, because Felis contains couple of constellations named after cat species, including Leo Major the great lion, Leo Minor the little lion, and Lynx the lynx. On the celestial map, Felis shapes like a cat sitting on its butt with narrow eastern half of Hydra shaping like a tail.

Notable stars Edit

Bright stars Edit

A B-type main sequence Regulus is the Felis' brightest star at a magnitude of 1.35, located in Leo Major. Regulus is one of the four brightest stars within 5° of the ecliptic, the others are Spica in Noctua, Antares in Simianus, and Aldebaran in Araneus.

The other notable bright stars in Felis are Alphard (a 1.98m K-type bright giant located in Hydra), and Denebola (a 2.14m A-type main sequence located in Leo Major).

Nearby stars Edit

A flaring red dwarf Wolf 359 (also designated CN Leonis because it is a UV Ceti variable star) is the Felis' nearest star at a distance of 7.78 light-years (2.39 parsecs). It is also the fourth nearest star system overall after the Alpha Centauri system in Simianus and Barnard's Star in Tarandus. However with a magnitude of 13.54, Wolf 359 can only be visible with a large telescope. It is one of the least massive stars known massing just 9% of the Sun's mass.

Planetary systems Edit

As of February 8, 2014, there are 76 exoplanets identified in 61 planetary systems in Felis. One notable example is 55 Cancri (P1 Fel), which has five planets (four of them are gaseous) and speculatively contains two undetected planets.

Another notable example is Gliese 436 (P8 Fel) in Leo Major, which has three planets, including a transiting midplanet Nemea (P120) as well as two unconfirmed sub-Earths and three hypothetical planets within 0.3 AU from the star. Nemea has an exotic form of water called "hot ice." Nemea's distance from the feeble parent star is 136 the Earth-Sun distance and has mass 22 times that of Earth and radius 414 times that of Earth, yielding a mean density nearly 50% greater than water and over one quarter the Earth's.

In Hydra, Gliese 433 (P28 Fel) contains a hot super-Earth and a low-mass sub-Jupiter in a 10-year orbit.

There are two planet-hosting stars identified in the Beehive Cluster: Pr0201 and Pr0211, both containing hot-Jupiters.

Three stars in M67 observed to have a planet.

Notable deep sky objects Edit

Felis contains several interesting deep sky objects. The Beehive Cluster (sometimes known as Praesepe) (M44, NGC 2632), which is an open cluster located in Cancer, M83 (sometimes called the Southern Pinwheel Galaxy, the Southern Whirlpool Galaxy or the Thousand Ruby Galaxy) (NGC 5236), which is a barred spiral galaxy located in Hydra, and a pair of dwarf galaxies in Leo Major: Leo I (PGC 29488) and Leo II (PGC 34176).

In Leo Major, it contains the Silverado Galaxy (NGC 3370), which is a spiral galaxy similar in size and mass to the Milky Way. Also in that same constellation, there is the peculiar spiral galaxy M65. M65 is one of three galaxies that form the Leo Triplet, the other two are M66 and NGC 3628. Another spiral galaxy in Leo Major is NGC 3521 with long spiral arms dotted with star-forming regions and a bright, compact nucleus.

There are two barred spiral galaxies in Leo Major: NGC 2903 and M95 (NGC 3351). M95 is a member of the Leo I galaxy group that also includes M96 (NGC 3368), M105 (NGC 3379), and several fainter NGC galaxies. M105 is an elliptical galaxy.

In Hydra, there is the Ghost of Jupiter (NGC 3242, C59), which is a planetary nebula that resembles the appearance of an human eye. Because of this appearance, this nebula can also be called the Eye Nebula. Also in this constellation, we find the open cluster M48. Located in Lynx, there is the globular cluster NGC 2419 (also known as the Intergalactic Tramp) (C25).

Gallery Edit

Beehive Cluster

The Beehive Cluster (also known as Praesepe) (M44, NGC 2632)

Ghost of Jupiter

The Ghost of Jupiter (also known as the Eye Nebula) (NGC 3242, C59)

M83

The spiral galaxy M83 (also known as the Southern Pinwheel Galaxy, the Southern Whirlpool Galaxy or the Thousand Ruby Galaxy) (NGC 5236)

Silverado Galaxy

The Silverado Galaxy (NGC 3370)

NGC 2419

The globular cluster NGC 2419 (also known as the Intergalactic Tramp) (C25)

M105

The elliptical galaxy M105 (NGC 3379)

NGC 3521

The spiral galaxy NGC 3521

Notable meteor showers Edit

The Leonids (also called Felids) tend to peak in mid-November every year radiating from Leo Major. This meteor shower is associated with the comet Tempel-Tuttle. It can sometimes be seen as a meteor storm approximately every 33 years when more than 1000 meteors per hour would be visible. The last meteor storm occurred in 2001.

Visibility Edit

In the northern hemisphere, Felis can most prominently be visible during winter. All of Felis can be visible from around the world except for the north polar region, south temperate zone, and south polar zone.

The most recognizable constellation in Felis is Leo Major which contains five bright stars, but other constellations except Hydra are faint and containing no bright stars (m<3.00).

Zodiac Edit

The Sun appears to cross Felis from July 21 till September 15: it crosses the constellations Cancer (July 21 till August 9) and then Leo Major (August 10 till September 15). This zodiacal caelregio is located between Araneus to the west and Noctua to the east.

Felis was formerly in the sign of zodiac from June 22 till August 21.


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