2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D (Rocco Parisi)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: NGC 5139 · Omega Centauri

2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D, Rocco Parisi

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2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

Link: http://flic.kr/p/byhzXD

Powered byPixInsight

2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

Link: http://flic.kr/p/byhzXD

Riprendere il famoso ammasso globulare Omega Centauri (NGC5139) è stata una bella sfida personale.

Questo è il più brillante ammasso globulare osservabile ad occhio nudo e il suo diametro apparente in cielo è pari a quello della luna piena.

La sfida viene dal fatto che esso si trova in cielo con declinazione -47°29', posizione

che dista dal polo SUD celeste circa 42°, quindi è osservabile teoricamente da luoghi a sud della latitudine +42°N (Roma).

Gli astrofili sanno quanto difficile sia riprendere un oggetto così basso a pochi gradi sopra l'orizzonte (Biancavilla 37°38'N), e sopra il quale rimane teoricamente solo 3 ore.

A ciò aggiungiamo il fatto che dal mio sito non riuscivo a scorgerlo ad occhio nudo ne tanto meno con il binocolo a causa dell'inquinamento luminoso (IL) che è massimo vicino l'orizzonte.

Il puntamento automatico della HEQ5 ha funzionato bene, ma non ho potuto utilizzare l'autoguida perchè l'IL copriva le stelle.

Eppure la luce delle stelle è riuscita a raggiungere il sensore della 550D insieme a una grande quantità di IL, che ricordo solo nelle foto analogiche con tempi di posa di 40-60min.

L'immagine è stata croppata al 90% circa.

Ottica: Rifrattore APO Scopos TL805 80mm/f7 + WO 0.8X + filtro Astronomik CLS

Modello fotocamera Canon EOS 550D (Rebel T2i) mod. Baader BCF

Seeing 2 (scala Antoniadi inversa)

42x60s 1600iso / 21 dark /21 flat / 21 bias

Integration 0h 42min

date 18/02/2012

temperatura 4°C (media)

Location Biancavilla -Catania-(Italy) -Classe 7(scala Bortle).

Elaborazione DSS + PSCS3

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	Distinct awarded users	Total awarded images
Image of the day
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
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Northern lights
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Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	3675288
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

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2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

2012 ngc5139 Aut_e4 with Scopos APO TL805 + 0.8X + AstronomikCLS + 550D

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