NGC 1778

Données d’observation (Époque J2000.0)
NGC 1778
L'amas ouvert NGC 1778
Constellation	Cocher^[1]
Ascension droite (α)	05^h 08^m 05,7^s^[2]
Déclinaison (δ)	37° 01′ 22″ ^[2]
Magnitude apparente (V)	7,7^[3]
Dimensions apparentes (V)	8,0′^[3]
Localisation dans la constellation : Cocher
Astrométrie
Distance	environ 1 469 pc (∼4 790 al) ^[4]
Caractéristiques physiques
Type d'objet	Amas ouvert
Classe	III2p
Galaxie hôte	Voie lactée
Âge	150 M a ^[4]
Découverte
Découvreur(s)	William Herschel^[1]
Date	17 janvier 1787^[1]
Désignation(s)	OCL 429^[3]
Liste des amas ouverts
modifier

NGC 1778 est un amas ouvert situé dans la constellation du Cocher. Il a été découvert par l'astronome germano-britannique William Herschel en 1787.

NGC 1778 est situé à environ 1 469 pc (∼4 790 al) du système solaire et les dernières estimations donnent un âge de 150 millions d'années. La taille apparente de l'amas est de 8,0 minutes d'arc, ce qui, compte tenu de la distance, donne une taille réelle maximale d'environ 11,1 années-lumière.

Selon la classification des amas ouverts de Robert Trumpler, cet amas renferme moins de 50 étoiles (lettre p) dont la concentration est moyennement faible (III) et dont les magnitudes se répartissent sur un intervalle moyen (le chiffre 2).

Notes et références

↑ ^{a b et c} (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 1778 » (consulté le 28 août 2022).
↑ ^{a et b} (en) « Results for object NGC 1778 », NASA/IPAC Extragalactic Database (consulté le 28 août 2022).
↑ ^{a b et c} « Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 1700 à 1799 », sur astrovalleyfield.com (consulté le 6 janvier 2024)
↑ ^{a et b} (en) « WEBDA page for open cluster NGC 1778, A site Devoted to Stellar Clusters in the Galaxy and the Magellanic Clouds » (consulté le 11 février 2017)

Voir aussi

Liens externes

(en) NGC 1778 sur la base de données NASA/IPAC Extragalactic Database
(en) NGC 1778 sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
(en) NGC 1778 sur spider.seds.org
(en) NGC 1778 sur la base de données LEDA
(en) NGC 1778 sur WikiSky
(en) NGC 1778 sur le site du professeur C. Seligman

• NGC 1770 • NGC 1771 • NGC 1772 • NGC 1773 • NGC 1774 • NGC 1775 • NGC 1776 • NGC 1777 • NGC 1778 • NGC 1779 • NGC 1780 • NGC 1781 • NGC 1782 • NGC 1783 • NGC 1784 • NGC 1785 • NGC 1786

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NGC 1700-1799	1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
NGC 1800-1899	1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
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