NGC 7139 "Double Still Nebula" (Diego Barucco)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7139

NGC 7139 "Double Still Nebula", Diego Barucco

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NGC 7139 "Double Still Nebula"

Link: http://pnebulae.altervista.org/catalogo/ngc/7139/immagini/04_img-bar3.html

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NGC 7139 "Double Still Nebula"

Link: http://pnebulae.altervista.org/catalogo/ngc/7139/immagini/04_img-bar3.html

NGC 7139 è una debole planetaria nel costellazione del Cefeo; sebbene le dimensioni siano già oltre il primo d'arco visualmente è un oggetto troppo esile e dal contrasto troppo basso per poter tentare di distiguere dettagli. Essa appare come una nebulosità tondeggiante con bordi sfumati e poco definiti; con telescopi di 20 cm è necessario l'uso del filtro OIII. Telescopi di più largo diametro possono aiutare a mostrare delle variazioni di luminosità al suo interno con distribuzione simmetrica. A livello fotografico è possibile invece svelare la difficile natura di questo oggetto. Da una prima occhiata si osserva come questa assomigli in modo sorprendente a NGC 6853 (M27) per la coratteristica forma a manubrio: una banda luminosa la percorre centralmente costituita da due condensazioni brillanti opposte, mentre lungo l'asse perpendicolare abbiamo la presenza di due deboli lobi. Si tratta quindi probabilmente di una planetaria bipolare toroidale del tipo M27 e le indagini spazio cinematiche eseguite nei primi anni novanta danno ragione a questa classificazione. La barra centrale è infatti il toroide visto quasi di taglio con i lobi perpendicolari. Inoltre questa nebulosa nelle riprese a colori evindezia una chiara stratificazione della ionizazzione nebulare: all'esterno troviamo in prevalenza emissione di Halpha, mentre all'interno nel toroide OIII.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Astrometry.net job	4058944
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NGC 7139 "Double Still Nebula"

NGC 7139 "Double Still Nebula"

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NGC 7139 "Double Still Nebula"

NGC 7139 "Double Still Nebula"

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