Ночной дозор
Oct. 21st, 2012 12:48 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
lauerz1. Вышел месяц из тумана, вынул ножик из кармана.
2. На самом деле это была головка сыра
3. Швейцарского, с дырками.
4. Юпитер
5. Опять Юпитер
6. И снова Юпитер. Все снимки сделаны на мою мыльницу на штативе.
Jupiter appears bright white and is a very obvious sight in the night sky. Like Venus, it can be seen in twilight, and it always shines brighter than the brightest star in the night sky - Sirius (magnitude -1.46). Viewed from the Earth, Jupiter is seen to move through about one zodiac constellation (ca. 30 degrees) each year.
Steadily-held, good quality binoculars or a small telescope will show Jupiter as a small white disk; its four brightest natural satellites (moons) - Ganymede (magnitude +4.6 at opposition), Io (+5.0), Europa (+5.3) and Callisto (+5.6) - can also be seen close by, changing their positions from one night to the next. The four moons are brighter than the typical naked eye limiting magnitude (ca. +6.0) and they would be visible to the unaided eye were it not for the fact that their close proximity to Jupiter causes them to be washed out by the glare of Jupiter itself. Sometimes only two or three moons will be seen on a given night - in which case, the remainder are either in front of, or behind, the giant planet.
Small telescopes will show Jupiter as a pale white or cream-colour. They will also reveal the planet's two most prominent cloud belts: the North and South Equatorial Belts, and with patience, Jupiter's most famous feature - its Great Red Spot.
Although it is by far the largest of the Solar System planets, Jupiter is not the brightest planet when seen from the Earth - this particular honour goes to Venus. Jupiter is fainter than Venus because of its much greater distance from the Earth.
Like Venus, Jupiter can also cast faint shadows at night when it is shining at its brightest and is observed under very dark skies.
