掠掩
外观
掠掩(也称为月掠掩星,月掠掩,或简称为掠)是一种月掩星现象,其中被掩蔽的恒星间歇性地消失与重现在月球的边缘[1]。 一个由许多观察者组成的团队可以结合掠掩并建塑月球地形在边缘的精确轮廓。
由于掠地路径很少经过已建立的观测场,业馀天文学家使用便携式观测设备并前往沿著阴影路径界线的地点。目标是尽可能准确地报告每个事件的UTC时间,以及接收GPS时间讯号的设备经常被用作时基。
使用两种方法进行观察:
- 目视:观察者有一个可听见的UTC报时装置(例如,调谐到WWV(无线电台)和录音设备(例如录音机)并通过望远镜观察目标,当恒星消失时,呼叫"消失",当恒星再次出现时,则呼叫"返回"。稍后分析音讯记录以提取事件时间。
- 影片:观察者使用小型摄影机,通常安装在望远镜的对焦器中。影片时间插入器 (VTI) 通常用于将 UTC 时间戳插入到录制的每一帧上。无论是手提摄影机、数位影片录影机或笔记型电脑用于录制视频流。稍后对视频记录进行分析以提取事件时间。
这些观察结果对以下方面很有用:
相关条目
[编辑]参考资料
[编辑]- ^ Buchheim, R. The Sky is Your Laboratory: Advanced Astronomy Projects for Amateurs. Springer Praxis Books. Springer New York. 2007: 40 [2021-10-08]. ISBN 978-0-387-73995-3.
- ^ Source – Occult (Software).
- ^ Soma, Mitsuru. Examination of the Hipparcos Proper Motion System from Lunar Occultation Analysis. IAU Colloq. 180: Towards Models and Constants for Sub-Microarcsecond Astrometry. 2000: 115. Bibcode:2000tmcs.conf..115S.
- ^ Sôma, Mitsuru; Kato, Yuji. Limb profiles of the Moon from grazing occultation observations collected at RGO (PDF) (报告). National Astronomical Observatory of Japan 6: 75–105. 2002-01-01 [2022-10-15]. Bibcode:2002PNAOJ...6...75S. (原始内容存档 (PDF)于2022-03-02).
- ^ Stephenson, F. R.; Morrison, L. V.; Hohenkerk, C. Y. Measurement of the Earth's rotation: 720 BC to AD 2015. Proc. R. Soc. A. 2016-12-01, 472 (2196): 20160404. Bibcode:2016RSPSA.47260404S. ISSN 1364-5021. PMC 5247521 . PMID 28119545. doi:10.1098/rspa.2016.0404 (英语).
进阶读物
[编辑]- Grazing Lunar Occultations, Royal Astronomical Society of New Zealand, [1]
- Eric, Limburg. Lunar Occultation Workbench 3.1: stellar occultations tailor-made to your needs. Occultation Newsletter, International Occultation Timing Association (IOTA). 2002-01-10, 8 (4): 4. Bibcode:2002OccN....8d...4L. ISSN 0737-6766 (英语).</ref> and
- Wilds, Richard P. Lunar Occultations, Grazing. Encyclopedia of Lunar Science. Cham: Springer International Publishing. 2018: 1–10. ISBN 978-3-319-05546-6. doi:10.1007/978-3-319-05546-6_220-3.
外部链接
[编辑]- Wood, Chuck. One Good Occultation Deserves Another. Lunar Photo of the Day. March 7, 2005 [2022-10-15]. (原始内容存档于2022-10-15)., showing grazing occultation of Jupiter as seen from Melbourne, Australia
- Astronomy Picture of Day for March 16, 2007, showing grazing occultation of Saturn [2] (页面存档备份,存于互联网档案馆)
- International Occultation Timing Association (页面存档备份,存于互联网档案馆) Predicted paths for future grazing occultations
- Zodiacal Catalogue (XZ80Q) of stars that can be occulted by the moon [3] (页面存档备份,存于互联网档案馆)
- Herald, David. VizieR Lunar Occultation Archive. vizier.u-strasbg.fr. VizieR. [2018-06-16]. (原始内容存档于2022-07-06).
- Predictions and analysis of Lunar Occultations and Grazing Lunar Occultations. Occult (Software), Lunar Occultation Workbench (LOW) and GRAZEPREP (页面存档备份,存于互联网档案馆)