本文選題：木星伽利略衛(wèi)星 + 去暈　； 參考：《暨南大學(xué)》2011年碩士論文

【摘要】：通過(guò)對(duì)行星天然衛(wèi)星互掩互食天象進(jìn)行測(cè)光可以得到非常準(zhǔn)確的天體測(cè)量信息,這些信息可以用來(lái)進(jìn)一步改進(jìn)行衛(wèi)星的運(yùn)動(dòng)理論和歷表。這些測(cè)光信息可以通過(guò)對(duì)互掩互食天文圖像進(jìn)行測(cè)光所得到的光度變化曲線進(jìn)行分析得到。俄羅斯學(xué)者Emelyanov對(duì)2002至2003年所觀測(cè)到的互掩互食圖像得到的多條光度變化曲線進(jìn)行了描述和分析。然而在文章中沒(méi)有詳述如何對(duì)圖像進(jìn)行測(cè)光處理才能得到光度變化曲線,在此本文將描述及討論如何從圖像資料中得到光度變化曲線。 通過(guò)對(duì)2003年及2009年在云南天文臺(tái)和威海天文臺(tái)兩架1米望遠(yuǎn)鏡拍攝的木衛(wèi)互掩互食天象的圖像進(jìn)行了測(cè)光處理,得到了許多情況下的光度變化曲線。對(duì)光度變化曲線進(jìn)行高斯函數(shù)擬合最終得到了互掩互食的中間時(shí)刻和下降的星等值。 在實(shí)際圖像處理中,很多圖像中的目標(biāo)星處于光暈之內(nèi),無(wú)法對(duì)其進(jìn)行準(zhǔn)確的測(cè)光。由于光暈具有良好的對(duì)稱(chēng)性,采用木星的中心為對(duì)稱(chēng)點(diǎn)進(jìn)行對(duì)稱(chēng)去暈。在文中采用橢圓擬合法對(duì)木星進(jìn)行定心,實(shí)驗(yàn)證明采用此方法對(duì)木星定心具有較高的精度。去完暈后的背景較為平坦,然后對(duì)目標(biāo)星進(jìn)行孔徑測(cè)光。另外發(fā)現(xiàn),孔徑大小的選取對(duì)于木衛(wèi)測(cè)光最終的結(jié)果有較很大的影響,實(shí)驗(yàn)表明在1.5倍至4.0倍的半高全寬的孔徑下進(jìn)行測(cè)光,所得到的光變曲線具有良好的穩(wěn)定性。在星象互食事件中,通常存在多顆參考星,應(yīng)對(duì)多顆參考星進(jìn)行對(duì)比測(cè)光,以得到更優(yōu)的光變曲線。
[Abstract]:Very accurate astrometric information can be obtained by photometry of the mutual eclipse of planetary natural satellites, which can be used to further change the theory and calendar of satellite motion. These photometric information can be obtained by analyzing the photometric variation curves obtained from the photometry of the masking and eating astronomical images. Emelyanov, a Russian scholar, described and analyzed a number of photometric curves obtained from the masking and eating images from 2002 to 2003. However, there is no detailed description of how to process the image to get the photometric change curve. In this paper, we will describe and discuss how to get the photometric change curve from the image data. Based on the photometric processing of the images of two 1-meter telescopes taken by Yunnan Observatory and Weihai Observatory in 2003 and 2009, the photometric variation curves were obtained in many cases. The Gao Si function fitting of the photometric variation curve results in the intermediate time of mutual masking and the decreasing star equivalent. In the actual image processing, the target stars in many images are in halo, so they can not be accurately measured. Due to the good symmetry of the halo, the center of Jupiter is used to remove the halo symmetrically. In this paper, the elliptical fitting method is used to center Jupiter, and the experimental results show that this method has a high accuracy for Jupiter centering. After the halo, the background is flat, and then the target star aperture photometry. In addition, it is found that the selection of aperture size has a great influence on the final results of wood and satellite photometry. The experimental results show that the photorefractive curves obtained by the method are stable in the range of 1.5 to 4.0 times of the full width of the maximum aperture. In the event of mutual eclipse of stars, there are usually many reference stars, which should be compared and photometric in order to obtain a better curve of light variation.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：P125;TP391.41

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