(415029) 2011 UL21 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "(415029) 2011 UL21" in Chinese language version.

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hohmanntransfer.com

Observations of small Solar-System bodies. hohmanntransfer. 2011-10-27 [2013-09-04]. （原始内容存档于2014-11-29）（英语）.

MPEC 2011-U39 : 2011 UL21. IAU Minor Planet Center. 2011-10-28 [2011-11-01]. （原始内容存档于2018-01-19）（英语）.
2011 UL21 Orbit. Minor Planet Center. [2012-05-17]. （原始内容存档于2023-03-30）（英语）. 2012 04 18 (arc=22 years)

JPL Small-Body Database Browser: (2011 UL21). Jet Propulsion Laboratory. [2016-04-08]. （原始内容存档于2023-09-01）（英语）. 2012-04-18 last obs (arc=22 years)
JPL Small-Body Database Search Engine: PHAs and H < 17 (mag). JPL Solar System Dynamics. [2011-11-20]. （原始内容存档于2021-09-27）（英语）.

Earth Impact Risk Summary: 2011 UL21. NASA/JPL Near-Earth Object Program Office. [2011-11-01]. （原始内容存档于2011-11-02）（英语）.
1.5e-06 = 1 in 667,000 chance. NASA/JPL Near-Earth Object Program Office. [2011-11-01]. （原始内容存档于2004-10-25）（英语）.

Date/Time Removed. NASA/JPL Near-Earth Object Program Office. [2011-11-06]. （原始内容存档于2023-03-30）（英语）.

MPEC 2011-U39 : 2011 UL21. IAU Minor Planet Center. 2011-10-28 [2011-11-01]. （原始内容存档于2018-01-19）（英语）.
JPL Small-Body Database Browser: (2011 UL21). Jet Propulsion Laboratory. [2016-04-08]. （原始内容存档于2023-09-01）（英语）. 2012-04-18 last obs (arc=22 years)
Earth Impact Risk Summary: 2011 UL21. NASA/JPL Near-Earth Object Program Office. [2011-11-01]. （原始内容存档于2011-11-02）（英语）.
Observations of small Solar-System bodies. hohmanntransfer. 2011-10-27 [2013-09-04]. （原始内容存档于2014-11-29）（英语）.
1.5e-06 = 1 in 667,000 chance. NASA/JPL Near-Earth Object Program Office. [2011-11-01]. （原始内容存档于2004-10-25）（英语）.
Date/Time Removed. NASA/JPL Near-Earth Object Program Office. [2011-11-06]. （原始内容存档于2023-03-30）（英语）.
2011 UL21 Orbit. Minor Planet Center. [2012-05-17]. （原始内容存档于2023-03-30）（英语）. 2012 04 18 (arc=22 years)
JPL Small-Body Database Search Engine: PHAs and H < 17 (mag). JPL Solar System Dynamics. [2011-11-20]. （原始内容存档于2021-09-27）（英语）.