about Grigoris Maravelias
Tag: <span>paper</span>

Tag: paper

First results on the Pluto system by New Horizons

The first scientific results regarding the Pluto system as observed from New Horizons have been published in Science [1]. It is impressive to see direct images and maps of such distant worlds. More remarkable is the complex geology and geomorphology which characterize both Pluto and Charon. Pluto is by far …

Pro-Am collaborations in Planetary Astronomy – review paper

Mousis O., et al., 2013, arXiv:1305.3647 Instrumental Methods for Professional and Amateur Collaborations in Planetary Astronomy This is a great collective work on various professional-amateur collaborations (written by both professionals and amateurs) regarding aspects of Planetary Astronomy, such as: terrestial planets (Mercury, Venus, Mars), gaseous planets (Jupiter, Saturn, Uranus, Poseidon), …

Kepler’s first results

Kepler is a space based telescope to study a small area between Cygnus and Lyra for exoplanet transits of all possible targets but mainly to find Earth sized candidates in the habitable zone. A fist publication reveals these numbers: “On 1 February 2011 the Kepler Mission released data for 156,453 …

Geminids and their mysterious parent body 3200 Phaethon

The Geminids are one of the best meteor showers of the year with numerous (ZHR~120)¬†and bright (r~2) meteors! The parent body is an asteroid named 3200 Phaethon, which is believed to be a candidate for an extinct cometary nucleus, a mystery by itself. Moreover, during the last perihelion passage of …

How big a star can be?

It seems that this question has no final answer yet. Although the recent models were claiming that no star bigger than 100-150 solar masses can exist, there is evidence that a star close to 300 solar masses exists in the Large Magellanic Cloud. One star, R136a1 (from the young cluster …