With encouragement and expectations, Scientific Space enters the new year. Although the International Year of Astronomy has passed, astronomy itself will never fade. 2010 will continue to be a year filled with spectacular celestial events. Scientific Space will continue to provide accurate and rich astronomical information to assist your observations. We wish everyone a happy and successful new year!
January: The Sun moves from Sagittarius to Capricornus
Jan 1: Partial Lunar Eclipse, magnitude 0.082
Jan 3: Mars in conjunction with the Moon
Jan 4: Peak of the Quadrantid meteor shower
Jan 5: Mercury at inferior conjunction
Jan 6: Saturn in conjunction with the Moon
Jan 12: Venus at superior conjunction
Jan 15: Annular Solar Eclipse / Saturn stationary
Jan 16: Mercury stationary / Venus in conjunction with the Moon
Jan 25, 19:00: Lunar occultation of the Pleiades
Jan 27: Mercury at greatest western elongation
Jan 30, 04:00: Mars at opposition
Moon Phases:
Full Moon: Jan 1, 03:13
Last Quarter: Jan 7, 18:39
New Moon: Jan 15, 15:11
First Quarter: Jan 23, 18:53
Full Moon: Jan 30, 14:18
January 1: Partial Lunar Eclipse
The partial lunar eclipse occurring on January 1, 2010, offers relatively good observation conditions in China.
At 01:17 Beijing Time on January 1, the Moon enters the Earth’s penumbra, marking the start of the penumbral eclipse. At 02:52, the Moon first touches the Earth’s umbra (first contact), marking the official start of the partial eclipse. One hour later (03:52), the Moon completely leaves the umbra (fourth contact), and the Moon returns to the penumbral phase until the event ends at 05:28. The most notable feature of this eclipse is its small magnitude. At approximately 03:22, when the eclipse reaches its maximum, the magnitude is only 0.0763. If observed with the naked eye, only a small darkened area on the edge of the Moon will be visible, while most of the lunar disk remains very bright.
January 4: Peak of the Quadrantid Meteor Shower
Even if you search a star map, you won’t find the constellation "Quadrans Muralis," but the Quadrantids remain one of the traditional major meteor showers. Its active period lasts from December 28 of the previous year to January 12. This means for nearly half a month, as long as the radiant is above the horizon at night, meteors from this shower can be seen. Quadrans Muralis was an old constellation that was later absorbed; the radiant is now located between the constellations Draco, Boötes, and Ursa Major, with a declination near 50^\circ.
For mid-to-high latitude regions in the Northern Hemisphere, this position is circumpolar and never sets, making the shower suitable only for Northern Hemisphere observers. According to the International Meteor Organization (IMO), the peak is expected around 03:00 Beijing Time on January 4. This timing is favorable for eastern China, as the radiant altitude will have risen to 40^\circ, while it may be lower in western regions. Overall, the forecast is very suitable for observation in China. However, the 2010 Quadrantids will face serious interference from moonlight, as the waxing gibbous moon will rise around 21:00 on the 3rd, affecting observations all night. The theoretical Zenithal Hourly Rate (ZHR) can exceed 100; observers can expect to see dozens of slightly reddish Quadrantid meteors per hour.
January 6, 16:00: Saturn in Conjunction with the Moon
January 15: Annular Solar Eclipse
The annular solar eclipse visible in China in 2010 is one of the most important astronomical events of the year. The entire event on January 15 will last about 5 hours, with an average path width of 300 kilometers. It begins in central Africa, passes through the Indian Ocean, southern India, and Myanmar, before entering China. Larger surrounding regions will experience partial solar eclipses of varying magnitudes. The longest duration of the annular phase occurs in the Indian Ocean, where the interval between the two internal contacts is 11 minutes and 8 seconds. This is significantly longer than the theoretical maximum for a total solar eclipse and is considered long even for an annular eclipse.
In China, the path of annularity passes through provinces including Yunnan, Sichuan, Guizhou, Chongqing, Hubei, Henan, Anhui, Shandong, and Jiangsu. Southwestern regions can see the entire process, while eastern regions will see the eclipse during sunset. Based on the solar altitude during the event, Yunnan Province offers the best observation conditions, though many other locations are suitable for photographing the eclipsed sun setting against the horizon.
Based on experience from the 2009 total solar eclipse, monitoring weather changes is crucial. Historical data shows Yunnan has the highest probability of clear skies. It is important to remember that unlike a total eclipse, the Moon never completely covers the Sun’s photosphere during an annular eclipse. Therefore, sufficient solar filters (such as Baader film) must be used for both visual and photographic observation at all times. If the annular eclipse occurs before sunset when atmospheric extinction is strong, some may be tempted to remove the filter for photography, but you must still never look directly at the Sun through a telescope.
January 25, 19:00: Lunar Occultation of the Pleiades
January 27: Mercury at Greatest Western Elongation
Due to its proximity to the Sun, Mercury is one of the most difficult planets to observe. Brief windows for observation occur near its greatest eastern or western elongations. The quality of these windows depends not only on the angular distance from the Sun but also on the relative declination. For Northern Hemisphere observers, conditions are better when Mercury’s declination is higher than the Sun’s. In 2010, Mercury has six elongations, but four of them (including the one on January 27) offer poor conditions for the Northern Hemisphere due to low declination. In early January, Mercury appears as an evening star. After inferior conjunction on January 5, it becomes a morning star in the southeastern sky. On January 27, it reaches greatest western elongation. Although the angular distance is 25^\circ, its low declination means its altitude at sunrise is only 13^\circ. Fortunately, its brightness reaches -0.2 magnitude, so you can try to find it in the dawn twilight.
January 30: Mars at Opposition
Mars opposition occurs when Mars, Earth, and the Sun are aligned, with Earth in the middle. Mars has the fastest orbital speed among the outer planets, with a period of about 687 days. The interval between oppositions is approximately 779 days; the last one was on December 25, 2007. Because the orbits of Earth and Mars are elliptical, the distance between them at opposition varies significantly. The closest approach usually occurs a week or two away from the actual opposition date. A "Perihelic Opposition" (Great Opposition) occurs when Mars is near its perihelion during opposition. The 2010 opposition sees a distance of about 99 million kilometers, much further than the 56 million kilometers during the Great Opposition of August 2003. Consequently, the apparent size and brightness differ: in 2003, the diameter was 25”, while this time it is only 14” with a magnitude of -1.3. Despite not being a Great Opposition, Mars will be visible all night in late January and will reach a high altitude at midnight, providing excellent observation conditions.
(Content compiled by Scientific Space. Some resources are from “Amateur Astronomer” magazine and the Skylook.Org website. We express our gratitude.)
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