SN 1572

SN 1572

Remnant of SN 1572 as seen in X-ray light from the Chandra X-ray Observatory
Event type	Astronomical radio source, astrophysical X-ray source
Type Ia[1]
Date	November 1572
Constellation	Cassiopeia
Right ascension	0h 25.3m
Declination	+64° 09′
Epoch	?
Galactic coordinates	G.120.1+1.4
Distance	between 8,000 ly (2.5 kpc) and 9,800 ly (3 kpc)
Remnant	Nebula
Host	Milky Way
Progenitor	Unknown
Progenitor type	Unknown
Colour (B-V)	~1
Peak apparent magnitude	−4
Other designations	SN 1572, HR 92, SN 1572A, SNR G120.1+01.4, SNR G120.2+01.4, 1ES 0022+63.8, 1RXS J002509.2+640946, B Cas, BD+63 39a, 8C 0022+638, 4C 63.01, 3C 10, 3C 10.0, 2C 34, RRF 1174, 1XRS 00224+638, 2U 0022+63, 3A 0022+638, 3CR 10, 3U 0022+63, 4U 0022+63, AJG 112, ASB 1, BG 0022+63, CTB 4, KR 101, VRO 63.00.01, [DGW65] 3, PBC J0024.9+6407, F3R 3628, WB 0022+6351, CGPSE 107, GB6 B0022+6352
Preceded by	SN 1181
Followed by	SN 1604
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SN 1572 (Tycho's Supernova, Tycho's Nova), or B Cassiopeiae (B Cas), was a supernova of Type Ia in the constellation Cassiopeia, one of eight supernovae visible to the naked eye in historical records. It appeared in early November 1572 and was independently discovered by many individuals.

Its supernova remnant has been observed optically but was first detected at radio wavelengths. It is often known as 3C 10, a radio-source designation, although increasingly as Tycho's supernova remnant.