Planetary Nebulae
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Medium- to large-sized True and Likely planetary nebulae from the DSH sample
  December 8th 2017 - Pascal Le Dû  Other / Varius   
Introduction
The Hong Kong/AAO/Strasbourg H? planetary nebula database (HASH) [1] incorporates almost 300 true, probable and possible planetary nebulae (PNe) that have been identified since 2003 within the framework of the Deep Sky Hunters (DSH) project, and other amateur-based efforts [2-4]. Our sample covers all types of different PN morphologies, spectral properties, and evolutionary states. Estimated distances range from below 1kpc to extragalactic. This contribution focuses on all currently known medium- to large-sized PNe and candidates (optical diam > 2? ) in our sample.
Results
The table below summarizes all 28 True (T) and Likely (L) PNe from the DSH sample with optical diameters > 2? and lists the fundamental properties of the nebular shells and the CSPNe. Previously unpublished objects are highlighted in blue. Statistically derived distances were taken from [5]. The listed CSPN magnitudes were extracted from PanStarrs photometry. For 15 objects with available UV, optical and IR photometry, we determined E(B-V) and T by fitting the spectral distributions of the CSPNe with distribution functions of blackbody emitters corrected for the effects of interstellar extinction using the formalism in [6] and assuming RV = 3.1. The GALEX UV fluxes were corrected by applying the revised photometric calibration from [7]. Effective wavelengths and zero points were taken from various resources. We note that two CSPNe (Pa 161 and Pa 153) have composite distribution functions with a hotter and a cooler component.
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  1284 inputs in total, with:
    - 166 planetary nebulae
    - 97 likely planetary nebulae
    - 67 possible planetary nebulae
    - 664 new candidates
    - 290 other objects
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 HASH:the Hong Kong/AAO/Strasbourg Hα planetary nebula database
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 CDS:Strasbourg astronomical Data Center
  Spectroscopic confirmations
 478 observations made
 Link to the spectroscopic observations list: here
    Here are all the spectroscopic observations carried out by the French Amateur Group on planetary nebula candidates.
  Unpublished PN candidates
 548 unpublished PN candidates.
 Acces to the complete list: here
    The candidates are said to be "published" when they are the object of an official publication in VizieR and in the CDS of the University of Strasbourg.
Planetary Nebulae
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Contributors: Pascal Le Dû - Thomas Petit - Olivier Garde - Nicolas Petit - Trygve Prestgard - Jean-Baptiste Feldmann - Lionel Mulato - Sakib Rasool - Dana Patchick - Xavier Strottner - Jean-Baptiste Auroux