Irokawa

08891, 1977 SB, 1977SB, 1983 UT, 1983UT, 1994 RC1, 1994RC1, J77S00B, J83U00T, J94R01C

All data for this body: [vot]

MPC data
Name (number) Irokawa (8891)
a 3.14732
e 0.22570
i / sin(i) 9.3951 / 0.16324
q 2.43696
Q 3.85768
ω 190.4754
Node 192.4039
m 161.4823
n 0.1765
Epoch 2460800.5
nobs 3483
nopp 29
Years observed 1977-2025
rms 0.72
Best values
[raw, vot]

Value Standard error
Parent
 
ap 3.159
ep 0.193
sin(ip) 0.156
G 0.150
H 12.790
Mass
D 16.30 0.218
pV 0.058 0.0022
Value
Rotational Period
Period quality None
Spectral Class D
Spectral Class Score 7.580
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
3.1587 0.1932 0.1562 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
15.65 0.680 0.680 Usui 2011PASJ...63.1117U NEATM
16.22 0.261 0.261 Masiero 2011ApJ...741...68M NEATM
16.42 3.280 3.280 Ali-Lagoa 2018A&A...612A..85A NEATM
16.59 2.420 2.420 Ryan&Woodward 2010AJ....140..933R IRAS-STM
16.74 0.662 0.662 Ryan&Woodward 2010AJ....140..933R IRAS-NEATM
16.87 1.690 1.690 Ali-Lagoa 2018A&A...612A..85A NEATM
17.07 0.900 0.900 Tedesco 2002AJ....123.1056T STM
17.85 4.500 4.500 Masiero 2020PSJ.....1....5M NEATM
18.69 5.301 5.301 Masiero 2017AJ....154..168M NEATM
20.58 6.552 6.552 Masiero 2017AJ....154..168M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.048 0.0348 0.0348 Masiero 2017AJ....154..168M NEATM
0.051 0.0344 0.0344 Masiero 2017AJ....154..168M NEATM
0.055 0.0060 0.0060 Tedesco 2002AJ....123.1056T STM
0.058 0.0047 0.0047 Ryan&Woodward 2010AJ....140..933R IRAS-NEATM
0.059 0.0030 0.0030 Ryan&Woodward 2010AJ....140..933R IRAS-STM
0.061 0.0120 0.0120 Ali-Lagoa 2018A&A...612A..85A NEATM
0.061 0.0109 0.0109 Masiero 2011ApJ...741...68M NEATM
0.065 0.0260 0.0260 Ali-Lagoa 2018A&A...612A..85A NEATM
0.066 0.0430 0.0430 Masiero 2020PSJ.....1....5M NEATM
G data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.15 MPC-2023-12-94 MPC-2023-12-94 Phot
H data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
12.79 MPC-2023-12-04 MPC-2023-12-04 Phot
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
D 0.14 Bus VIS Carvano 2010A&A...510A..43C PHOT
D DeMeo-Carry VIS DeMeo 2013Icar..226..723D PHOT
D D 0.8833 0.8833 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT