The shape of the LoTr 5 planetary nebula

Noah Brosch*, Yehuda Huffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We observed the large and faint planetary nebula around IN Com in Hα and N II light with a coronagraphic charge-coupled device on the Wise Observatory reflector, blocking the light from the central star. Our goal was to provide a second image of the object with which to confirm the features seen in the only published photograph from the paper by Longmore & Tritton reporting the discovery of this object. The nebula is extremely faint, but a combination of images totalling about one and a half hours of exposure shows it fairly well. A novel image processing algorithm has been applied to the noisy image in order to reveal faint extended details of the images. The algorithm is based on a non-linear self-adaptive filter applied to the wavelet transform of the image. The nebula is not round or elliptical, but shows a two-lobed or possibly three-lobed morphology, as well as a peculiar hole-like feature east of the central star. There is definite east-west and slightly less definite north-south asymmetry.

Original languageEnglish
Pages (from-to)241-245
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - 11 May 1999


  • Binaries: close
  • Circumstellar matter
  • Planetary nebulae: individual: LoTr 5
  • Stars: imaging
  • Stars: individual: IN Com


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