Table legend

The table legend of object information

1. Galaxies

a. type

  The morphological classification scheme of galaxies has been used the revised Hubble's original division of galaxies, into ellipticals, spirals, barred spirals, and irregulars, established by a French astronomer of de Vaucouleurs.
  At first all galaxies are classed into 4 major shapes of Ellipticals(E), Lenticular(S0), Spirals(S), and Irregulars(I). The S0 class has been newly defined as an intermediate one between E and S. And this scheme does not considers the barred galaxies as a class, - but adds notation for bars in general (B), for the absence of bars (A), and the mixed state (AB). Furthermore other notations representing characteristic shapes added, - for inner and outer ring structure (r and R), and for a global "S" design (s).
  The spiral galaxies are grouped into 10 stages from "0/a", the most closed arms, to "d" with loosely wound arms, and adding a stage of "m", Magellanic unsettled structures.
  For example a face-on galaxy of M101 in Ursa Major is classified as "SAB(rs)cd", meaning that it has an incipient bar (type SAB), its spiral arms are not quite as straggling as they could be (type cd), and that the galaxy has an overall S-shape and its inner arms close in a ring around the central bulge (rs).
  And the luminosity class of spirals, established by van den Bergh, is indicated by a Roman numerical following the de Voucouleurs's type. The class has been ranged from I-V, class I galaxies have very long organized arms, class Vs have very poorly organized patterns. The M101 has fairly developed arms, classified as "SAB(rs)cd I".

  You can refer theoretical descriptions about morphological classification of galaxies at this site for instance.

Galaxy Classification System by E.Hubble

Ellipticals: E
8 stages from round shape (E0) to lens-shaped (E7)
Spirals: S
3 types from closed arms(Sa), medium(Sb) and opened(Sc)
Barred Spirals: SB
3 types from closed arms(SBa), medium(SBb) and opened(SBc)
Irregulars: I, Ir
Between E & S types: S0, between E & SB: SB
"p" is added in peculiar shaped Galaxies (ex. Sbp, E6p, etc.).

**Revised Morphological Galaxy Classification System by de Vaucouleurs**
Classes	Families	Varieties	Stages	T	Types
Ellipticals		Compact		-6	cE
			Elliptical(0-6)	-5	E0 to E6
			Intermediate	-5	E0-1 (ex.)
		Giant Ellipticals		-4	E+
Lenticulars				S0
	Non-barred				SA0
	Barred				SB0
	Mixed				SAB0
		Inner ring			S(r)0
		S-shaped			S(s)0
		Mixed			S(rs)0
			Early	-3	S0-
			Intermediate	-2	S0°
			Late	-1	S0+
Spirals	Non-barred				SA
	Barred				SB
	Mixed				SAB
		Inner ring			S(r)
		S-shaped			S(s)
		Mixed			S(rs)
			0/a	0	S0/a
			a	1	Sa
			ab	2	Sab
			b	3	Sb
			bc	4	Sbc
			c	5	Sc
			cd	6	Scd
			d	7	Sd
			dm	8	Sdm
			m	9	Sm
Irregulars	Non-barred				IA
	Barred				IB
	Mixed				IAB
		S-shaped			I(s)
			Non-Magellanic	90	I0
			Magellanic	10	Im
		Compact		11	cI
Peculiars				99	Pec
Peculiars		Peculiarity		pec
(All types)			Uncertain		:
			Doubtful		?
			Spindle		sp
			Outer ring		(R)
			Pseudo outer ring		(R')

※Column "T" indicates index of Hubble types.

b. Other IDs

There are several large scaled galaxy catalogs in addition to Messier, NGC or IC catalogs,
some principal numbers of these catalogs are indicated.

Codes	Names of Catalogs	# of Objects	Features
PGC	Principal Galaxy Catalog	983,261	The largest catalog of galaxies in all sphere brighter than 18th magnitude
UGC	Uppsala General Catalog of Galaxies	12,939	Galaxies with >1' in size and/or <14.5th magnitude in northern hemisphere by Palomar Observatory Sky Survey(POSS)
UGCA	UGC Galaxies (addendum)		Supplement of UGC catalog
MCG	Morphological Galaxy Catalog	29,003	Galaxies positioned north of Dec.=-18° identified by POSS
CGCG	Catalog of Galaxies and Clusters of Galaxies	9,134	Galaxies with <1' and <14.5th magnitude not included in UGC
ESO	Uppsala Survey of the ESO(B)Atlas	16,164	Galaxies positioned <-18° in Dec. surveyed by European Southern Observatory (ESO)
IRAS	IRAS Point Source Catalog Version 2.0	245,889	Sources of infrared observed by IRAS satellite
DDO	David Dunlop Observatory Catalog of Dwarf Galaxies	222	Catalog of dwarf galaxies
HCG	Hickson Compact Group	463	100 Compact galaxy groups in all skies and member galaxies
Arp	-	338	Peculiar galaxies by Halton Arp

c. Radial Velocity

This column indicates relative velocity measured from red shift (or blue shift) of each galaxy, The "+" means leaving and "-" means closing to us.
This values usually used to estimate the distance to each galaxy farther than about 10 millions light years.

2. Galaxy Clusters

A catalog of "Abell" covers 5250 galaxy clusters in all sphere with # of member galaxies over 50 and red shift z<0.2.
The type of galaxy cluster consists of 3 parts of Distance Class, Richness Class and Blautz-Morgan Class.
For example the type of "3 2 I-II" means the distance class of 3, richness class of 2, and a bit larger brightness difference of 2 principal members.

Distance Class...Magnitude of 10th brightest member galaxy (Mag10)

Class	Magnitude
1	13.3 - 14.0
2	14.1 - 14.8
3	14.9 - 15.6
4	15.7 - 16.4
5	16.5 - 17.2
6	17.3 - 18.0
7	>18.0

Richness Class...# of galaxies with brightness of 3rd brightest member(Mag3) to Mag3 + 2

Class	# of Galaxies
0	30 - 49
1	50 - 79
2	80 - 129
3	130 - 199
4	200 - 299
5	>300

Blautz-Morgan Class...Mag. difference between 2 brightest galaxies

Class	Mag. difference
I	Large difference
II	Moderate difference
III	Little or no difference

3. Planetary Nebula

The designation of planetary nebula without IDs of NGC or IC is used the scheme of PK (Perek & Kohoutek). The PK catalog contains 1036 planetary nebulae and is represented as format of PK nnn(+ or -)nn.n. The first two terms represent integers of galactic longitude and latitude respectivery, and the last integer is consecutive # in the respective area of 1deg. x 1deg.
The type of planetary nebula is used the scheme of Vorontsov-Velyaminov as follows.

I...Stellar image

II...Smooth disk a...brighter toward center

b...uniform brightness

c...traces of ring structure

III...Irregular disk a...very irregular brightness distribution

b...traces of ring structure

IV...Ring structure

V...Irregular form similar to diffuse nebula

VI...Anomalous form

4. Open Clusters

2 classification codes indicated as possible of Shapley's 5 classes from "very loose" (c type) to "rich & concentrated" (g type) and Trumpler's classification scheme as folows.
Trumpler's code consists of three parts of Concentration, Brightness range and richness.

Concentration

I...Detached. Strong concentration toward center
II...Detached. Weak concentration toward center
III...Detached. No concentration toward center
IV...Not well detached from surrounding star field

Brightness Range

1...Small range in brightness
2...Moderate range in brightness
3...Large range in brightness

Richness

p...Poor (less than 50 stars)
m...Moderately rich (50 - 100 stars)
r...Rich (over 100 stars)

5. Globular Clusters

Shapley-Sawyer's concentration class indicated. Values range from I to XII. The smaller the number, the more concentrated the cluster.

6. Diffuse, Reflection, and Dark Nebulae

The Lynd's classification classes are indicated.

Class of Bright Nebula...Consists of 2 parts, meaning brightness and kind of emission.

Brightness

on a scale of 1 (brightest) to 6 (faintest)

Kind of emission

E...emission (diffused) nebula
R...reflection nebula
E+R...combination

Class of Dark Nebula...Consists of 2 parts, meaning opacity and shape.

Opacity

on a scale of 1 (least opaque) to 6 (most opaque)

Shape

Ir...irregular
E...elliptical
C...circular
Co...cometary
K...kidney
S...S-shaped

Some principal catalog numbers of nebulae are indicated in addition to Messier, NGC and IC numbers.

Catalog code	Principal name	Features
Sh2	Sharpless	Synthesis catalog of inner-galactic diffused nebulae
LBN	Lynd's Catalogue of Bright Nebulae	Synthesis catalog of diffused and reflection nebulae
RCW	Rodgers, Campbell, Whiteoak	Catalog of H-alpha regions in southern Milky Way plane vicinity
vdB	van den Bergh	Synthesis catalog of inner-galactic reflection nebulae
B	Barnard	182 dark nebulae
LDN	Lynd's Catalogue of Dark Nebulae	Synthesis catalog of inner-galactic dark nebulae

I...Stellar image
II...Smooth disk	a...brighter toward center
	b...uniform brightness
	c...traces of ring structure
III...Irregular disk	a...very irregular brightness distribution
	b...traces of ring structure
IV...Ring structure
V...Irregular form similar to diffuse nebula
VI...Anomalous form