1991 NP2

1991NP2, 09181, 1977 PB2, 1977PB2, 1991 PD3, 1991PD3, J77P02B, J91N02P, J91P03D

All data for this body: [vot]

MPC data
Name (number) 1991 NP2 (9181)
a 2.31669
e 0.15038
i / sin(i) 6.8548 / 0.11935
q 1.96830
Q 2.66508
ω 350.9613
Node 317.2916
m 206.7218
n 0.2795
Epoch 2460800.5
nobs 3458
nopp 24
Years observed 1977-2025
rms 0.64
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.317
ep 0.116
sin(ip) 0.125
G 0.150
H 13.890
Mass
D 3.87 0.162
pV 0.356 0.1024
Value
Rotational Period 5.600
Period quality 2
Spectral Class S
Spectral Class Score 2.184
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.3173 0.1159 0.1253 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Nov-2024
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
3.87 0.162 0.162 Masiero 2011ApJ...741...68M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.356 0.1024 0.1024 Masiero 2011ApJ...741...68M 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
13.89 MPC-2023-12-04 MPC-2023-12-04 Phot
Periods
[raw, vot]

Value Quality Side real or Synodic Author Reference Method
5.6004 2 Synodic Pal 2020ApJS..247...26P Lightcurve
5.60053 2 Sidereal Durech 2023A&A...675A..24D Model
Spectral Class Data
[raw, vot]

Class 1 Class 2 Probability of Class 1 Probability of Class 2 Taxonomy Wavelength Author Reference Method
S 0.364 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT