掠掩
掠掩(也稱為月掠掩星,月掠掩,或簡稱為掠)是一種月掩星現象,其中被掩蔽的恆星間歇性地消失與重現在月球的邊緣[1]。 一個由許多觀察者組成的團隊可以結合掠掩並建塑月球地形在邊緣的精確輪廓。
由於掠地路徑很少經過已建立的觀測場,業餘天文學家使用便攜式觀測設備並前往沿著陰影路徑界線的地點。目標是盡可能準確地報告每個事件的UTC時間,以及接收GPS時間訊號的設備經常被用作時基。
使用兩種方法進行觀察:
- 目視:觀察者有一個可聽見的UTC報時裝置(例如,調諧到WWV(無線電臺)和錄音設備(例如錄音機)並通過望遠鏡觀察目標,當恆星消失時,呼叫"消失",當恆星再次出現時,則呼叫"返回"。稍後分析音訊記錄以提取事件時間。
- 影片:觀察者使用小型攝影機,通常安裝在望遠鏡的對焦器中。影片時間插入器 (VTI) 通常用於將 UTC 時間戳插入到錄製的每一幀上。無論是手提攝影機、數位影片錄影機或筆記型電腦用於錄製視頻流。稍後對視頻記錄進行分析以提取事件時間。
這些觀察結果對以下方面很有用:
相關條目
參考資料
- ^ 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).
進階讀物
- 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.
外部連結
- 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)