English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We present the results of imaging photometric and long-slit spectroscopicobservations of comet 2P/Encke performed at the heliocentric distance 0.56 au,geocentric distance 0.65 au, and phase angle 109.2 deg on November 4, 2013 andat 1.05 au, 1.34 au, and 46.8 deg on January 23, 2017. Observations werecarried out at the 6-m BTA telescope of the Special Astrophysical Observatory(Russia) with the multimode focal reducer SCORPIO-2. In 2013, the direct imagesof comet Encke were obtained with the broad-band V filters, whereas in 2017 thenarrow-band cometary BC, RC, and NH2 filters as well as the medium-band SED500and broad-band r-sdss filters were used for observations. About 60 emissionsbelonging to the CN, C2, C3, NH2, CH, and CO+ molecules were identified withinthe range 3750-7100 {\AA}. The ratios of the production rates C2/CN and C3/CNcorrespond to the typical comets, not depleted in the carbon-chain. A complexstructure of the coma was detected in both observational periods. In January2017, the dust was in general concentrated near the nucleus, the dust/gas ratiowas 2.9 in the r-sdss filter, however, this ratio was larger than 1 atdistances 3000-40000 km from the nucleus. We found that about 75% of the fluxof the reflected light in the central pixel was due to the nucleus, whereas thenucleus's flux contributed 48% in the total intensity of the 2000 km area ofthe coma. We found that after correction for the dust coma contamination thenucleus magnitude is 18.8m+/-0.2m.

Comet 2P/Encke in apparitions of 2013 and 2017: I. Imaging photometry and long-slit spectroscopy