HCG 57 Sestetto di Copland (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: NGC 3745 · NGC 3746 · NGC 3748 · NGC 3750 · NGC 3751 · NGC 3753 · NGC 3754

HCG 57 Sestetto di Copland, Alberto Tomatis

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HCG 57 Sestetto di Copland

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HCG 57 Sestetto di Copland

HCG 57, forse meglio noto come Settetto Copland, è sempre stato ritenuto un oggetto fotografico. In effetti le componenti sono tutte molto deboli e richiedono, per una visione agevole, un telescopio di almeno 40 cm. Il gruppo è costituito da 2 terzetti di galassie separati da 3' in direzione NW-SE. Quello più meridionale contiene la più brillante, ossia NGC 3753, allungata da WNW a SSE con dimensioni di 80''x30'' e che presenta un piccolo nucleo di aspetto stellare. NGC 3750 si trova a neppure un primo di distanza verso SW ed è una piccola galassietta compatta che visualmente appare come un nodulo rotondo del diametro di una ventina di secondi. Ancora più difficile ed elusiva è NGC 3754, situata praticamente a ridosso verso NE della componente principale. Del secondo terzetto, invece, la meno difficile è probabilmente NGC 3746; sebbene la fotografia riveli inconfondibilmente la sua natura barrata e la galassia sia circonfusa da un tenue alone elongato da NW a SE, visualmente appare solo come una debolissima chiazza rotonda del diametro inferiore a 1'. Pure molto debole è NGC 3748, situata a poco più di 1.5 verso NE, ma essendo più piccola della precedente e più compatta, si riesce a vedere nonostante abbia una magnitudo integrata maggiore di quasi un punto! Solo di recente sono riuscito a osservare NGC 3745, situata 45'' a nord della 3746, grazie a una nottata osservativa con cielo e trasparenza ottime durante a la quale ho potuto spingere gli ingrandimenti a ben 380x! L'ultima galassietta del Settetto è NGC 3751, la più meridionale. Anche questa è debolissima, e a 188x appare rotonda con diametro di una 30-ina di secondi.

Descrizione del sito "Le galassie di Hickson"

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