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Comet Lulin
Comet Lulin (official designation C/2007 N3 (Lulin), Traditional Chinese:鹿林彗星) is a non-periodic comet. It was discovered by Ye Quanzhi and Lin Chi-Sheng from Lulin Observatory. It peaked in brightness and arrived at perigee for observers on Earth on February 24, 2009,〔 at magnitude +5,〔〔 〕 and at 0.411 AU from Earth.〔(【引用サイトリンク】title=JPL Close-Approach Data: C/2007 N3 (Lulin) )〕 The comet was near conjunction with Saturn on February 23, and passed near Regulus in the constellation of Leo on February 26 and 27, 2009.〔〔 It was expected to pass near Comet Cardinal on May 12, 2009. The comet became visible to the naked eye from dark-sky sites around February 7.〔(【引用サイトリンク】title=Naked-Eye Comet )〕 It passed near the double star Zubenelgenubi on February 6, near Spica on February 15 and 16, near Gamma Virginis on February 19 and near the star cluster M44 on March 5 and 6. It also passed near the planetary nebula NGC 2392 on March 14, and near the double star Wasat around March 17.〔(【引用サイトリンク】title=Path of Comet C/2007 N3 (Lulin), Mar. 1 - 20, 2009 )〕 According to NASA, Comet Lulin's green color comes from a combination of gases that make up its local atmosphere, primarily diatomic carbon, which appears as a green glow when illuminated by sunlight in the vacuum of space. When SWIFT observed comet Lulin on 28 January 2009, the comet was shedding nearly 800 gallons (approximately 3028 liters) of water each second. Comet Lulin was methanol-rich.
== Discovery ==
The comet was first photographed by astronomer Lin Chi-Sheng (林啟生) with a telescope at the Lulin Observatory in Nantou, Taiwan on July 11, 2007. However, it was the 19-year-old Ye Quanzhi (葉泉志) from Sun Yat-sen University in China who identified the new object from three of the photographs taken by Lin.
Initially, the object was thought to be a magnitude 18.9 asteroid, but images taken a week after the discovery with a larger telescope revealed the presence of a faint coma.〔〔
The discovery occurred as part of the Lulin Sky Survey project to identify small objects in the Solar System, particularly Near-Earth Objects. The comet was named "Comet Lulin" after the observatory, and its official designation is Comet C/2007 N3.〔(【引用サイトリンク】title=Newfound Comet Lulin to Grace Night Skies )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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