Hickson68 and NGC5371 (Davide Nardulli)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: HD121197 · NGC 5350 · NGC 5353 · NGC 5354 · NGC 5355 · NGC 5358 · NGC 5371

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Hickson68 and NGC5371

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Hickson68 and NGC5371

Il gruppo di galassie Hickson 68 e la galassia a spirale NGC 5371 nella costellazione dei Canes Venatici sono abbastanza vicini tra loro ma NGC 5371 non appartiene allo stesso gruppo nonostante siano a una distanza simile, circa 100/120 milioni di anni luce da noi, perché ' non rispetta i criteri che Paul Hickson nel 1982 si diede per caratterizzare tali gruppi , i criteri utilizzati si possono sintetizzare in 3 punti pincipali che descrivo brevemente :
1. Il gruppo deve avere almeno 4 galassie, tutte con discreta luminosità.
2. Il gruppo deve essere isolato e non semplicemente parte di un grande ammasso.
3. Il gruppo deve essere compatto, con una distanza tra loro simile alle loro dimensioni.
Viene da se' che la NGC 5371 non rispettando il terzo criterio principale non è stata inclusa nel catalogo Hickson 68. Ho ripreso questo ampio campo nei giorni 10, 11 e 12 Maggio con filtri a banda larga Optolong per 13 ore in una composizione LRGB

light : Luminanza 140x180s bin1 , RGB 120x180s bin2
acquisizione dati : Asi Air Plus
telescopio : Skywatcher Newton 250/1000 F4
camera principale : Asi 2600 MM pro
guida : Oag-L + Asi 290 MM mini
ruota filtri : Efw 7x2
focheggiatore : Eaf 5v
montatura : Skywatcher EQ6R-pro
elaborazione: PixInsight, Dss e Photoshop

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Status	Advanced success
Started	...
PixInsight job	M3K0BWSLAVSVI72OVX9A7MHNEO67FUGP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h54m20s.668
RA (top/left)	13h56m18s.613
RA (top/right)	13h52m25s.776
RA (bottom/right)	13h52m23s.752
RA (bottom/left)	13h56m14s.878

Dec (center)	+40°20′27″.60
Dec (top/left)	+40°35′21″.25
Dec (top/right)	+40°36′07″.15
Dec (bottom/right)	+40°05′24″.22
Dec (bottom/left)	+40°04′35″.38

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