List of exoplanets detected by radial velocity
List of confirmed extrasolar planets

Planet
Mass (MJ)
Period (d)
Semi-major axis (AU)
Eccentricity
Inclination (°)
Year of discovery
Gliese 876 d
0.021
1.938
0.021
0.2067
50.201
2005
GJ 3634 b
0.022
2.646
0.029
0.0801
58.683
2011
Gliese 581 e
0.008
3.149
0.028
0.0261
50.537
2009
Tau Boötis b
8.389
3.312
0.048
0.0236
150.521
1996
COROT-7c
0.026
3.698
0.046
0.0018
78.206
2009
Upsilon Andromedae b
1.266
4.617
0.059
0.0226
147.169
1996
Gliese 581 b
0.059
5.369
0.041
0.0159
57.259
2005
Gliese 581 c
0.021
12.929
0.073
0.1674
53.550
2007
HD 38529 Ab
0.782
14.310
0.129
0.2477
123.331
2000
55 Cancri b
1.030
14.651
0.118
0.0096
126.780
1996
Gliese 876 c
0.714
30.088
0.131
0.2559
48.071
2001
55 Cancri c
0.214
44.364
0.247
0.0048
53.241
2002
Gliese 876 b
2.276
61.117
0.211
0.0324
83.929
1998
Gliese 581 d
0.026
66.800
0.218
0.3809
58.257
2007
Gliese 876 e
0.046
124.262
0.338
0.0546
120.548
2010
HD 60532 b
3.150
201.825
0.761
0.2776
162.580
2008
Upsilon Andromedae c
6.673
237.746
0.753
0.2396
16.746
1999
55 Cancri f
0.190
259.805
0.804
0.2963
54.619
2005
Epsilon Reticuli b
4.500
415.241
1.156
0.0583
17.403
2000
Iota Draconis b
9.395
511.098
1.272
0.7124
69.920
2002
HD 147513 b
1.268
540.361
1.265
0.2577
111.525
2002
Pollux b
2.409
589.636
1.693
0.0204
90.684
2006
HD 60532 c
7.457
607.065
1.586
0.0383
162.060
2008
Mu Arae b
1.709
643.252
1.495
0.1284
78.867
2000
HD 128311 c
3.215
918.751
1.720
0.1709
49.731
2005
HD 10647 b
1.493
1040.389
2.055
0.1632
38.640
2003
Upsilon Andromedae d
6.094
1302.605
2.527
0.3181
42.633
1999
HAT-P-17c
1.416
1797.885
2.748
0.0968
77.217
2010
Epsilon Eridani b
1.552
2502.236
3.383
0.7021
30.110
2000
55 Cancri d
4.783
5169.447
5.901
0.0141
53.031
2002

Question: What are the most extreme exoplanet periods?
Answer: The longest period of an exoplanet is 55 Cancri d, which takes 5169 days and the shortest period is Gliese 876 d, which takes just 1.938 days.