Celestial Atlas
(IC 1550 - 1599) ←     IC Objects: IC 1600 - 1649 Link for sharing this page on Facebook     → (IC 1650 - 1699)
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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 Feb 21, 2014
WORKING 1601: Check types, add basic pix, captions, tags

IC 1600 (= PGC 3253)
Discovered (Nov 3, 1898) by
DeLisle Stewart (128)
A magnitude 14.8 spiral galaxy (type Sbc?) in Cetus (RA 00 55 04.2, Dec -23 31 28)
Based on a recessional velocity of 11725 km/sec, a straightforward calculation indicates that IC 1600 is about 545 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 520 million light years away at the time the light by which we see it was emitted, a little over 530 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.7 by 0.45 arcmin, it is about 105 thousand light years across. (Note to self: Directly checked per final protocols.)
DSS image of spiral galaxy IC 1600
Above, a 2.4 arcmin wide closeup of IC 1600
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy IC 1600

IC 1601 (= PGC 3287)
Discovered (Nov 3, 1898) by
DeLisle Stewart (129)
A magnitude 13.7 spiral galaxy (type Sab??) in Cetus (RA 00 55 34.7, Dec -24 09 12)
Apparent size 0.9 by 0.4 arcmin?

IC 1602 (= PGC 3306)
Discovered (Dec 16, 1898) by
Herbert Howe (1)
A magnitude 14.3 elliptical galaxy (type E1??) in Cetus (RA 00 55 51.8, Dec -09 59 07)
Apparent size 0.7 by 0.6 arcmin?

IC 1603 (= PGC 3401)
Discovered (1899) by
DeLisle Stewart (130)
A magnitude 13.8 spiral galaxy (type Sc??) in Phoenix (RA 00 56 59.7, Dec -45 24 46)
Apparent size 1.3 by 0.8 arcmin?

IC 1604
Recorded (Nov 19, 1898) by
Lewis Swift (XII-4)
A lost or nonexistent object in Cetus (RA 00 58 00.0, Dec -16 13 00)

IC 1605 (= PGC 3436)
Discovered (1899) by
DeLisle Stewart (131)
A magnitude 12.9 spiral galaxy (type SBbc??) in Phoenix (RA 00 57 37.4, Dec -48 54 10)
Apparent size 1.6 by 1.3 arcmin?

IC 1606
Recorded (Sep 14, 1895) by
Lewis Swift (XI-7)
A lost or nonexistent object in Cetus (RA 00 58 22.3, Dec -12 10 47)

IC 1607 (= PGC 3512)
Discovered (Jun 24, 1895) by
Herbert Howe (3)
A magnitude 13.4 spiral galaxy (type S??) in Cetus (RA 00 58 48.9, Dec +00 35 14)
Apparent size 0.9 by 0.9 arcmin?

IC 1608 (= PGC 3549)
Discovered (Oct 3, 1897) by
Lewis Swift (XI-8)
A magnitude 12.4 lenticular galaxy (type S0/a??) in Sculptor (RA 00 59 24.2, Dec -34 19 47)
Apparent size 2.0 by 0.9 arcmin?

IC 1609 (= PGC 3567)
Discovered (Sep 4, 1897) by
Lewis Swift (XI-9)
A magnitude 12.6 lenticular galaxy (type S0??) in Phoenix (RA 00 59 46.7, Dec -40 20 01)
Apparent size 1.4 by 1.4 arcmin?

IC 1610 (= PGC 3681)
Discovered (Dec 13, 1895) by
Lewis Swift (XI-10)
A magnitude 12.9 lenticular galaxy (type S0/a??) in Cetus (RA 01 01 42.7, Dec -15 34 04)
Apparent size 1.4 by 1.0 arcmin?

IC 1611 (in the Small Magellanic Cloud)
Discovered (Sep 2, 1826) by
James Dunlop (26)
A magnitude 12.0 open cluster in Tucana (RA 00 59 48.7, Dec -72 19 57)
Apparent size 1.0 arcmin?

IC 1612 (in the Small Magellanic Cloud)
Discovered (Sep 5, 1826) by
James Dunlop (26)
A magnitude 12.5 open cluster in Tucana (RA 00 59 59.6, Dec -72 22 15)
Apparent size 0.7 arcmin?

IC 1613 (= PGC 3844)
Discovered (September, 1906) by
Max Wolf
A magnitude 9.2 irregular galaxy (type IB(s)m) in Cetus (RA 01 04 48, Dec +02 07 07)
IC 1613 is a member of the Local Group. Its recessional velocity is -235 km/sec, and therefore 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 its apparent size of 16.2 by 14.5 arcmin, the galaxy is about 11 thousand light years across, and is therefore considered a "dwarf". Most of the stars in IC 1613 are about 7 billion years old, but there are a considerable number of younger 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 irregular galaxy IC 1613
Above, a 12 arcmin region centered on the galaxy
Below, a "deep" 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 irregular galaxy IC 1613
Below, an ultraviolet image of the 15 arcmin region centered on the galaxy. Low-surface brightness galaxies such as IC 1613 are hard to distinguish from the general background of faint stars in our own galaxy in visible light, but if they contain some hot young stars can be easily observed in the ultraviolet, where the "background" is less noticeable. (Image credit: NASA/JPL-Caltech/SSC/GALEX/Planetary Photojournal)
GALEX image of irregular galaxy IC 1613

IC 1614 (= PGC 2025913)
Discovered (Nov 30, 1899) by
Stephane Javelle (831)
A magnitude 16.6 elliptical galaxy (type E0??) in Pisces (RA 01 05 06.9, Dec +33 11 25)
Apparent size 0.3 by 0.3 arcmin?

IC 1615 (= PGC 3812)
Discovered (1899) by
DeLisle Stewart (134)
A magnitude 13.4 spiral galaxy (type Sbc??) in Phoenix (RA 01 04 06.8, Dec -51 07 58)
Apparent size 1.3 by 0.6 arcmin?

IC 1616 (= PGC 3846)
Discovered (May 24, 1897) by
Lewis Swift (XII-5)
A magnitude 12.6 spiral galaxy (type SBbc??) in Sculptor (RA 01 04 56.1, Dec -27 25 44)
Apparent size 1.6 by 1.4 arcmin?

IC 1617 (= PGC 3818)
Discovered (1899) by
DeLisle Stewart (135)
A magnitude 13.7 lenticular galaxy (type S0/a??) in Phoenix (RA 01 04 16.7, Dec -51 01 57)
Apparent size 1.4 by 0.6 arcmin?

IC 1618 (= PGC 3899)
Discovered (Dec 2, 1896) by
Hermann Kobold (1, K12)
A magnitiude 14.7 lenticular galaxy (type S0??) in Pisces (RA 01 05 55.9, Dec +32 24 46)
Apparent size 1.2 by 0.5 arcmin?

IC 1619 (= PGC 3975)
Discovered (Nov 28, 1899) by
Stephane Javelle (832)
A magnitiude 14.6 spiral galaxy (type S??) in Pisces (RA 01 07 22.4, Dec +33 04 01)
Apparent size 0.7 by 0.5 arcmin?

IC 1620 (= PGC 3960)
Discovered (Nov 13, 1903) by
Stephane Javelle (833)
A magnitude 13.4 spiral galaxy (type SBbc??) in Pisces (RA 01 07 14.0, Dec +13 57 18)
Apparent size 1.0 by 0.7 arcmin?

IC 1621 (= PGC 3915)
Discovered (1899) by
DeLisle Stewart (136)
A magnitude 13.2 spiral galaxy (type Sbc??) in Phoenix (RA 01 06 22.6, Dec -46 43 31)
Apparent size 1.3 by 0.4 arcmin?

IC 1622 (= PGC 3997)
Discovered (Nov 19, 1897) by
Lewis Swift (XI-11)
A magnitude 13.7 spiral galaxy (type S??) in Cetus (RA 01 07 36.6, Dec -17 32 19)
Apparent size 0.7 by 0.5 arcmin?

IC 1623 (= PGC 4007 + PGC 4008 (= PGC 4009), and =
Arp 236)
Discovered (Nov 19, 1897) by Lewis Swift (XI-12)
An interacting pair of galaxies in Cetus
PGC 4007 (IC 1623A) = A magnitude 13.9 irregular galaxy (type Irr? pec) at RA 01 07 46.8, Dec -17 30 24
PGC 4008 (IC 1623B) = A magnitude 14.5 irregular galaxy (type Irr? pec) at RA 01 07 48.1, Dec -17 30 24
Apparent size of PGC 4007 is about 0.9 by 0.7 arcmin(?), and of PGC 4008 about 0.7 by 0.6 arcmin(?) Used by the Arp Atlas as an example of a galaxy with the appearance of fission.
HST image of irregular galaxies PGC 4007 and PGC 4008, the interacting pair of galaxies that comprise IC 1623, also known as Arp 236
Above, a 1.2 arcmin wide closeup of IC 1623 (Image Credits: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)

IC 1624 (in the Small Magellanic Cloud)
Discovered (Sep 5, 1826) by
James Dunlop (34)
A magnitude 12.9 open cluster in Tucana (RA 01 05 21.9, Dec -72 02 33)
Apparent size 0.7 arcmin?

IC 1625 (= PGC 4001)
Discovered (1899) by
DeLisle Stewart (138)
A magnitude 12.0 lenticular galaxy (type E/S0??) in Phoenix (RA 01 07 42.6, Dec -46 54 30)
Apparent size 1.6 by 1.2 arcmin?

IC 1626 (in the Small Magellanic Cloud)
Discovered (Nov 27, 1900) by
DeLisle Stewart (139)
An open cluster in Tucana (RA 01 06 13.4, Dec -73 17 53)

IC 1627 (= PGC 4027)
Discovered (1899) by
DeLisle Stewart (140)
A magnitude 12.9 spiral galaxy (type SBb??) in Phoenix (RA 01 08 10.8, Dec -46 05 38)
Apparent size 2.5 by 0.6 arcmin?

IC 1628 (= PGC 4075)
Discovered (Oct 12, 1897) by
Lewis Swift (XII-6)
A magnitude 12.5 lenticular galaxy (type E/S0? pec) in Sculptor (RA 01 08 47.5, Dec -28 34 56)
Apparent size 1.1 by 1.1 arcmin?

IC 1629 (= PGC 4122)
Discovered (Dec 22, 1897) by
Stephane Javelle (834)
A magnitude 14.4 "compact" galaxy (type C??) in Cetus (RA 01 09 18.1, Dec +02 34 05)
Apparent size 0.4 by 0.3 arcmin?

IC 1630 (= PGC 4036)
Discovered (1899) by
DeLisle Stewart (141)
A magnitude 14.3 spiral galaxy (type Sb??) in Phoenix (RA 01 08 16.8, Dec -46 45 15)
Apparent size 1.5 by 0.3 arcmin?

IC 1631 (= PGC 4068)
Discovered (1899) by
DeLisle Stewart (142)
A magnitude 13.3 spiral galaxy (type Sab??) in Phoenix (RA 01 08 44.7, Dec -46 28 31)
Apparent size 0.9 by 0.6 arcmin?

IC 1632 (= PGC 4205)
Discovered (Dec 23, 1897) by
Stephane Javelle (835)
A magnitude 15.5 elliptical galaxy (type E0??) in Pisces (RA 01 10 43.4, Dec +17 41 00)
Apparent size 0.2 by 0.2 arcmin?

IC 1633 (= PGC 4149)
Discovered (Aug 5, 1826) by
James Dunlop (437)
A magnitude 11.5 elliptical galaxy (type E1??) in Phoenix (RA 01 09 55.5, Dec -45 55 53)
Apparent size 2.6 by 2.4 arcmin?

IC 1634 (= PGC 4232)
Discovered (Dec 23, 1897) by
Stephane Javelle (836)
A magnitude 14.7 elliptical galaxy (type E0??) in Pisces (RA 01 11 03.0, Dec +17 39 45)
Apparent size 0.4 by 0.4 arcmin?

IC 1635 (= PGC 4231)
Discovered (Dec 23, 1897) by
Stephane Javelle (837)
A magnitude 14.7 elliptical galaxy (type E0??) in Pisces (RA 01 11 03.6, Dec +17 39 06)
Apparent size 0.3 by 0.3 arcmin?

IC 1636 (= PGC 4280)
Discovered (Oct 17, 1903) by
Stephane Javelle (838)
A magnitude 14.4 lenticular galaxy (type S0??) in Pisces (RA 01 11 37.3, Dec +33 21 18)
Apparent size 0.3 by 0.2 arcmin?

IC 1637 (= PGC 4227)
Discovered (1899) by
DeLisle Stewart (144)
A magnitude 12.8 spiral galaxy (type SBc??) in Sculptor (RA 01 11 01.2, Dec -30 26 19)
Apparent size 1.7 by 1.3 arcmin?

IC 1638 (= PGC 4338)
Discovered (Oct 17, 1903) by
Stephane Javelle (839)
A magnitude 14.1 lenticular galaxy (type S0??) in Pisces (RA 01 12 21.7, Dec +33 21 54)
Apparent size 0.7 by 0.7 arcmin?

IC 1639 (= PGC 4292)
Discovered (Dec 14, 1903) by
Stephane Javelle (840)
A magnitude 13.1 peculiar galaxy (type pec??) in Cetus (RA 01 11 46.5, Dec -00 39 50)
Apparent size 0.9 by 0.8 arcmin?

IC 1640 (= PGC 4299)
Discovered (Dec 14, 1903) by
Stephane Javelle (841)
A magnitude 14.4 "compact" galaxy (type C??) in Cetus (RA 01 11 51.2, Dec -00 37 50)
Apparent size 0.2 by 0.2 arcmin?

IC 1641 (in the Small Magellanic Cloud)
Discovered (Nov 27, 1900) by
DeLisle Stewart (143)
An open cluster in Tucana (RA 01 09 39.1, Dec -71 46 08)

IC 1642 (=
IC 1645 = PGC 95507)
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)
A magnitude 15.5 lenticular galaxy (type E/S0??) in Pisces (RA 01 12 27.3, Dec +15 45 02)
This entry will only contain historical information; for anything else see IC 1645.

IC 1643 (= PGC 4328)
Discovered (Dec 18, 1897) by
Stephane Javelle (843)
A magnitude 14.2 spiral galaxy (type S??) in Cetus (RA 01 12 08.5, Dec -00 24 35)
Apparent size 0.8 by 0.8 arcmin?

IC 1644 (in the Small Magellanic Cloud)
Discovered (1901) by
Williamina Fleming (83)
An emission nebula in Tucana (RA 01 09 12.0, Dec -73 11 44)

IC 1645 (=
IC 1642 = PGC 95507)
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)
A magnitude 15.5 lenticular galaxy (type E/S0??) in Pisces (RA 01 12 27.3, Dec +15 45 02)
Apparent size 0.4 by 0.4 arcmin?

IC 1646 (= PGC 4357)
Discovered (Nov 24, 1897) by
Stephane Javelle (845)
A magnitude 14.5 spiral galaxy (type SBbc??) in Pisces (RA 01 12 43.8, Dec +15 42 25)
Apparent size 0.5 by 0.5 arcmin?

IC 1647 (= PGC 4390)
Discovered (Nov 12, 1903) by
Stephane Javelle (846)
A magnitude 15.0 spiral galaxy (type Sc??) in Andromeda (RA 01 13 14.5, Dec +38 53 07)
Apparent size 0.7 by 0.3 arcmin?

IC 1648 (= PGC 4417)
Discovered (Dec 7, 1899) by
Stephane Javelle (847)
A magnitude 14.4 lenticular galaxy (type S0??) in Pisces (RA 01 13 42.2, Dec +33 13 05)
Apparent size 0.4 by 0.3 arcmin?

IC 1649 (= PGC 4298)
Discovered (1899) by
DeLisle Stewart (145)
A magnitude 13.9 spiral galaxy (type Sbc??) in Phoenix (RA 01 11 50.8, Dec -55 51 24)
Apparent size 1.7 by 0.3 arcmin?
Celestial Atlas
(IC 1550 - 1599) ←     IC Objects: IC 1600 - 1649     → (IC 1650 - 1699)