Central main belt

The central main belt is dynamically limited in semi-major axis by the 3J:-1A and 5J;-2A mean-motion resonances  (Zappalá et al. 1995).   The linear secular resonance g-g6 separates the low-inclined asteroid region from the highly inclined area, dominated by the Hansa and Pallas families (Carruba 2010b).  As discussed in Carruba (2010b), in the highly inclined region the local web of linear secular resonances and mean-motion resonances divided the region into six separated stable islands, each hosting one or more major families, and that can be considered as a stable archipelago.  Of particular interest in this region is the Tina family, whose members are all in anti-aligned states of the g-g6 linear secular resonance (Carruba and Morbidelli 2011).  We found 3693 objects that have proper elements and frequencies, SDSS-MOC4 a* and i-z colors, WISE geometric albedo data, and satisfy our error analysis criteria, in the central main belt.  The central main belt is a transitional region, where CX-complex and S-complex asteroids are rather mixed.  A greater proportion of S-type asteroids can be found at lower semi-major axis (and vice-versa), but overall, no group dominate the local taxonomy.
Central density
Central aiz
Central pv
Contour plot of the number density of asteroids in the proper element sample. 
Superimposed, we display the orbital location of asteroids of families in the CX-complex (plus signs) and S-complex (circles).
An (a*,i-z) projection of central main belt asteroids in the in our multi-domain sample.
A histogram of number frequency values ni/NTot as a function of geometric albedo pV for central main belt  asteroids in our multi-domain sample.

First halo
member
dmd [m/s]
Number of
members
Spectral
complex
Number of
SDSS-MOC4
interlopers
Number of
albedo
interlopers
(46) Hestia: (7321)
360
26
CX
11
12
(5) Astraea: (4018)
320
4
CX
0
0
(396) Aeolia: (76144)
320
14
CX
0
2
(410) Chloris: (9545)
340
35
CX
1
8
(569) Misa: (2289)
335
33
CX
1
1
(606) Brangane: (56748)
355
3
S
1
3
(1639) Bower: (26703)
260
27
CX
6
7
(2980) Cameron: (4067)
310
3
CX
0
2
(15) Eunomia: (630)
90
52
S
7
7
(4652) Iannini: (143366)
305
93
CX
0
6
(1272) Gefion: (2373)
210
146
S
43
33
(145) Adeona: (1783)
295
149
CX
1
4
(170) Maria/Renate: (4104)
240
135
S
21
10
(363) Padua: (2560)
130
31
CX
0
0
(3) Juno: (22216)
275
61
CX
0
4
(668) Dora: (1734)
265
108
CX
2
2
(808) Merxia/Nemesis: (3439)
250
19
CX
5
8
(847) Agnia: (1020)
190
12
S
4
4
(1128) Astrid: (2169)
435
6
CX
0
0
(1726) Hoffmeister: (1726)
210
62
CX
0
0
(2354) Lavrov: (2354)
200
8
S
1
2
(18466) 1995 SU37: (95534)
105
4
S
0
0
(729) Watsonia: (5492)
425
10
CX
3
5
(686) Gersuind: (14627)
310
7
S
3
2
(10000) Myriotos: (101897)
580
7
CX
2
6
(480) Hansa: (13617)
535
20
S
1
0
(4203) Brucato: (4203)
950
32
CX
0
2
(945) Barcelona: (11028)
730
1
S
0
0
(1222) Tina: (16257)
890
1
CX
0
0
(148) Gallia: (40853)
410
3
S
0
0
(2) Pallas: (24793)
920
8
CX
0
8