Celestial Atlas
(IC 1550 - 1599) <—     IC Objects: IC 1600 - 1649     —> (IC 1650 - 1699)
Click here for Introductory Material
QuickLinks:
1600, 1601, 1602, 1603, 1604, 1605, 1606, 1607, 1608, 1609, 1610, 1611, 1612, 1613, 1614, 1615, 1616,
1617, 1618, 1619, 1620, 1621, 1622, 1623, 1624, 1625, 1626, 1627, 1628, 1629, 1630, 1631, 1632, 1633,
1634, 1635, 1636, 1637, 1638, 1639, 1640, 1641, 1642, 1643, 1644, 1645, 1646, 1647, 1648, 1649

Page last updated May 31, 2011
WORKING: Add positions/physical data (per Steinicke)

IC 1600 (= PGC 3253)
Discovered (Nov 3, 1898) by
DeLisle Stewart (128)
A 15th-magnitude spiral galaxy (type Sb) in Cetus (RA 00 55 04.2, Dec -23 31 28)

Based on recessional velocity of 11725 km/sec, about 520 million light years away. Given that and apparent size of 1.1 by 0.6 arcmin, about 165 thousand light years in diameter.

Wikisky image of IC 1600
Above, a 2.4 arcmin wide closeup of IC 1600
Below, a 12 arcmin wide region centered on the galaxy
Wikisky image of region near IC 1600

IC 1601
Discovered (Nov 3, 1898) by
DeLisle Stewart (129)


IC 1602
Discovered (Dec 16, 1898) by
Herbert Howe (1)


IC 1603
Discovered (1899) by
DeLisle Stewart (130)


IC 1604
Discovered (Nov 19, 1898) by
Lewis Swift (XII-4)


IC 1605
Discovered (1899) by
DeLisle Stewart (131)


IC 1606
Discovered (Sep 14, 1895) by
Lewis Swift (XI-7)


IC 1607
Discovered (Jun 24, 1895) by
Herbert Howe (3)


IC 1608
Discovered (Oct 3, 1897) by
Lewis Swift (XI-8)


IC 1609
Discovered (Sep 4, 1897) by
Lewis Swift (XI-9)


IC 1610
Discovered (Dec 13, 1895) by
Lewis Swift (XI-10)


IC 1611
Discovered (Sep 2, 1826) by
James Dunlop (26)


IC 1612
Discovered (Sep 5, 1826) by
James Dunlop (26)


IC 1613 (= PGC 3844)
Discovered (September, 1906) by
Max Wolf
A 9th-magnitude dwarf irregular galaxy (type IB(s)m) in Cetus (RA 01 04 48, Dec +02 07 07)

A member of the Local Group. The recessional velocity is -235 km/sec, and completely useless for estimating the distance -- a not unusual situation for nearby galaxies, for which peculiar (non-Hubble expansion) velocities are often larger than the Hubble expansion velocity. Redshift-independent distance estimates range from 2.1 to 2.6 million light years, yielding a statistically averaged distance of 2.3 to 2.45 million light years. Given that and apparent size of 16.2 by 14.5 arcmin, it is about 11 thousand light years in diameter, hence its designation as a dwarf galaxy. Most of the stars in IC 1613 are about 7 billion years old (although there are a considerable number of younger, population I stars, as shown in the GALEX image at bottom). Among them are at least five Population II Cepheid variables, which have helped calibrate the period-luminosity relation for Cepheids. Other than the Magellanic Clouds, IC 1613 is the only Local Group irregular galaxy in which (the much fainter) RR Lyrae variables have also been detected.

SDSS image of IC 1613
Above, a 12 arcmin region centered on the galaxy
Below, a "deep" CFHT image of a slightly smaller field of view
(Image credit and ©: Jean-Charles Cuillandre (CFHT) & Giovanni Anselmi (Coelum), CFHT (used by permission))
CFHT image of IC 1613

Below, an ultraviolet image of the 15 arcmin region centered on the galaxy. Low-surface brightness galaxies such as IC 1613 are difficult to image in visible light (the CFHT image required considerable observing time), but (providing they contain at least some hot young stars) are more easily observed in the ultraviolet, where the general background is less noticeable. (Image credit: NASA, JPL-Caltech, SSC, GALEX, Planetary Photojournal)

GALEX image of IC 1613

IC 1614
Discovered (Nov 30, 1899) by
Stephane Javelle (831)


IC 1615
Discovered (1899) by
DeLisle Stewart (134)


IC 1616
Discovered (May 24, 1897) by
Lewis Swift (XII-5)


IC 1617
Discovered (1899) by
DeLisle Stewart (135)


IC 1618
Discovered (Dec 2, 1896) by
Hermann Kobold (1, K12)


IC 1619
Discovered (Nov 28, 1899) by
Stephane Javelle (832)


IC 1620
Discovered (Nov 13, 1903) by
Stephane Javelle (833)


IC 1621
Discovered (1899) by
DeLisle Stewart (136)


IC 1622
Discovered (Nov 19, 1897) by
Lewis Swift (XI-11)


IC 1623
Discovered (Nov 19, 1897) by
Lewis Swift (XI-12)


IC 1624
Discovered (Sep 5, 1826) by
James Dunlop (34)


IC 1625
Discovered (1899) by
DeLisle Stewart (138)


IC 1626
Discovered (Nov 27, 1900) by
DeLisle Stewart (139)


IC 1627
Discovered (1899) by
DeLisle Stewart (140)


IC 1628
Discovered (Oct 12, 1897) by
Lewis Swift (XII-6)


IC 1629
Discovered (Dec 22, 1897) by
Stephane Javelle (834)


IC 1630
Discovered (1899) by
DeLisle Stewart (141)


IC 1631
Discovered (1899) by
DeLisle Stewart (142)


IC 1632
Discovered (Dec 23, 1897) by
Stephane Javelle (835)


IC 1633
Discovered (Aug 5, 1826) by
James Dunlop (437)


IC 1634
Discovered (Dec 23, 1897) by
Stephane Javelle (836)


IC 1635
Discovered (Dec 23, 1897) by
Stephane Javelle (837)


IC 1636
Discovered (Oct 17, 1903) by
Stephane Javelle (838)


IC 1637
Discovered (1899) by
DeLisle Stewart (144)


IC 1638
Discovered (Oct 17, 1903) by
Stephane Javelle (839)


IC 1639
Discovered (Dec 14, 1903) by
Stephane Javelle (840)


IC 1640
Discovered (Dec 14, 1903) by
Stephane Javelle (841)


IC 1641
Discovered (Nov 27, 1900) by
DeLisle Stewart (143)


IC 1642 (=
IC 1645)
Discovered (Jan 29, 1897) by Stephane Javelle (842) (and later listed as IC 1642)
Discovered (Nov 24, 1897) by Stephane Javelle (and later listed as IC 1645)


IC 1643
Discovered (Dec 18, 1897) by
Stephane Javelle (843)


IC 1644
Discovered (1901) by
Williamina Fleming (83)


IC 1645 (=
IC 1642)
Discovered (Jan 29, 1897) by Stephane Javelle (and later listed as IC 1642)
Discovered (Nov 24, 1897) by Stephane Javelle (844) (and later listed as IC 1645)


IC 1646
Discovered (Nov 24, 1897) by
Stephane Javelle (845)


IC 1647
Discovered (Nov 12, 1903) by
Stephane Javelle (846)


IC 1648
Discovered (Dec 7, 1899) by
Stephane Javelle (847)


IC 1649
Discovered (1899) by
DeLisle Stewart (145)

Celestial Atlas
(IC 1550 - 1599) <—     IC Objects: IC 1600 - 1649     —> (IC 1650 - 1699)
Click here for Introductory Material