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A nearby Sun-like star in the constellation Andromeda regarded as a promising candidate for habitability if it possesses any Earth-like planets within its habitable zone. It ranks in the top five stars most likely to support life in a shortlist drawn up in 2006 by astrobiologist Margaret Turnbull, one of the authors of HabCat (Catalog of Nearby Habitable Systems).
The failure, thus far, to find large substellar objects like brown dwarfs or a Jupiter- or Saturn-class planet in a "torch" orbit (closer han the Mercury to Sun distance) around 107 Piscium -- with even the highly sensitive radial-velocity technique of Geoffrey W. Marcy and R. Paul Butler -- bodes well for the possibility of Earth-type terrestrial planets around this star (Cumming et al, 1999). Indeed, the distance from 107 Piscium where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.62 AU -- between the orbital distances of Mercury and Venus in the Solar System. At that distance from the star, such a planet would have an orbital period of about 202 days -- less than two thirds of an Earth year.
The most Sun-like of the 30 nearest stars to the Sun.
It is not known if the star is accompanied by any planets – its low metallicity makes it questionable whether the nebula from which it condensed had sufficient heavy element content to allow planet-sized objects to form). However, if any planets are present, (...) they are likely to be subjected to a much more intense bombardment than anything the Earth has experienced, making the survival of any life problematic.
No large substellar companion has been found thus far (Murdoch et al, 1993). However, the distance from 82 Eridani A where an Earth-type planet would be "comfortable" with liquid water is centered around 0.80 AU -- midway between the orbital distances of Venus and Earth in the Solar System. At that distance from the star, such a planet would have an orbital period of almost 275 days, or over two thirds of an Earth year. Astronomers are hoping to use NASA's Terrestrial Planet Finder (TPF) and the ESA's Darwin planned groups of observatories to search for a rocky inner planet in the so-called "habitable zone" (HZ) around 82 Eridani. As currently planned, the TPF will include two complementary observatory groups: a visible-light coronagraph to launch around 2014; and a "formation-flying" infrared interferometer to launch before 2020, while Darwin will launch a flotilla of three mid-infrared telescopes and a fourth communications hub beginning in 2015.
54 Piscium is an orange-red main-sequence dwarf star of spectral and luminosity type K0+ V. The star may have 79 percent of Sol's mass (exoplanets.org), 86 percent of its diameter (Johnson and Wright, 1983, page 645), and 46 to 49 percent of its luminosity. With a fairly long rotational period of 48 days compared with Sol that is suggestive of greater age
The orbit of an Earth-like planet with surface water would be centered within 0.68 AU -- around the orbital distance Venus in the Solar System -- and take around 240 days (two-thirds of a year) to complete. However, the inner, eccentric orbit of a giant planetary companion "b" recently discovered around 54 Piscium would probably disturb the orbit of such an Earth-type planet.
Kappa Pavonis is a solar analog, ie, a star whose physical characteristics such as temperature, metallicity or the presence of nearby stellar companions are similar to those of the Sun. The same spectral type to the Sun, G2V, is a yellow dwarf with effective temperature is 5748 K. The value of metallicity is very close to solar, and its mass of 1.15 mass solar. Its estimated age is within the range from 5420 and 6760 million years, which corresponds to an age of 800 - 2000 million years older than the Sun
Alpha Mensae is a yellow-orange main sequence dwarf star of spectral and luminosity type G5-6 V, with about 87 percent of Sol's mass, 84 to 91 percent of its diameter (Perrin and Karoji, 1987, page 236; and Johnson and Wright, 1983, page 659), and around 80 percent of its luminosity. The star may be as as enriched (102 percent) as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron (Cayrel de Strobel et al, 1991, page 285).
(...)Alpha Mensae has become one of the top 100 target stars for NASA's planned Terrestrial Planet Finder (TPF)(...)
ζ1 Reticuli is slightly less massive and luminous than the Sun. Spectral class of the star is G2.5 V.
ζ2 Reticuli has a very similar mass and luminosity to our Sun. The spectral type of the star is G1 V.
(...)Zeta1 Reticuli has become one of the top 100 target stars for NASA's planned Terrestrial Planet Finder (TPF)(...)
Once thought to be old Population II, galactic-halo-type subdwarf stars, Zeta1 and its companion are more likely to be old disk stars (Da Silva and Foy, 1987), that may be as much as eight billion years old.
(from The Zeta Reticuli Incident, NICAP) The fact that only the stars where it would be convenient or simply possible to have a place to stop are shown on that map is in itself significant.
Indeed Marjorie Fish first tried models using nearby stars of other than strictly solar type as defined in the article. She found no resemblances.
The fact that she came up with a pattern that fits as well as it does is a tribute to her perseverance and the accuracy of the models. Stars cannot be moved around "to optimize the desired resemblance"
Originally posted by wylekat
Just out of rank curiosity -an older thread about pulsars possibly being used as navigation devices comes to mind about now. I don't want to complicate it- but I wonder... what would the relative distances of any pulsars to these areas selected on the maps? I think only one would be needed for a 'relative' beacon if that's what they could be used for. Be one way to push proof for that theory...
I can almost hear the skeptics greasing up their eyeballs for the rolling sessions...
Originally posted by RyanLA123
Hmmmm. When listening to Bob Lazar on his numerous interviews he mentions something about how the alien craft he worked on came from the zeta reticuli star system. He says maybe they had star charts or maybe me and john lear got drunk one night and incorporated there story into ours or something along those lines. You begin to realize the world is full of FOOLS and CHEATERS!