Orbit Fit and Astrometric record for 14YZ91

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 14YZ91    
# Created Sat Dec  4 02:13:13 2021
# Orbit generated from Bernstein formalism
# Fitting     24 observations of     24
# Arc:   3.96y
# First observation: 2014/12/16
#  Last observation: 2018/12/02
Preliminary a, adot, b, bdot, g, gdot:
   0.000227   0.029248   0.000066  -0.005265   0.028085   0.000000
# Chi-squared of fit:     7.21 DOF:     42 RMS:  0.10
# Min/Max residuals:    -0.18    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.691840E-05  2.955684E-02 -3.241640E-06 -5.332217E-03  2.678642E-02  4.352477E-03
# Covariance matrix:
  5.2940E-13 -4.4977E-13 -7.6876E-14  7.2048E-14 -2.3792E-13 -2.8156E-12
 -4.4977E-13  5.1276E-13  8.3115E-14 -9.3013E-14  2.0449E-13  3.5005E-12
 -7.6876E-14  8.3115E-14  2.5022E-13 -9.8087E-14  9.4291E-14  6.8232E-13
  7.2048E-14 -9.3013E-14 -9.8087E-14  5.8897E-14 -3.8389E-14 -6.8737E-13
 -2.3792E-13  2.0449E-13  9.4291E-14 -3.8389E-14  4.6619E-13  1.9446E-12
 -2.8156E-12  3.5005E-12  6.8232E-13 -6.8737E-13  1.9446E-12  2.6436E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -28.756912    5.401824   -0.962819   -0.096612   -0.176454  2457007.542018
# Heliocentric elements and errors
Epoch:              2457000.5000  =  2014/12/09
Mean Anomaly:           27.65616 +/-     0.015
Argument of Peri:      205.42093 +/-     0.031
Long of Asc Node:      116.42299 +/-     0.001
Inclination:            30.02182 +/-     0.000
Eccentricity:         0.27066944 +/-    0.0002
Semi-Major Axis:     47.86364889 +/-    0.0070
Time of Perihelion: 2447708.7714 +/-       4.6
Perihelion:          34.90842194 +/-    0.0091
Aphelion:            60.81887585 +/-    0.0117
Period (y)              331.1440 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.68949980 +/-    0.0008
Ecliptic Y            4.06006615 +/-    0.0001
Ecliptic Z          -17.96055311 +/-    0.0005
Ecliptic XDOT        -0.00016124 +/-    0.0000
Ecliptic YDOT         0.00301449 +/-    0.0000
Ecliptic ZDOT        -0.00069172 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.51891526 +/-    0.0008
Geocenter to KBO     37.33234785 +/-    0.0010
# Hcoef:  7.99

The following table shows the complete astrometric record for 14YZ91. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (14YZ91) followed by the observatory code and reference code for the source of the astrometry.

2014 12  16.04124  01 08 03.654  -24 06 53.50  23.4i 14YZ91    W84  C~55TQ      
2015 01  13.06627  01 08 04.592  -23 44 46.98  24.1g 14YZ91    W84  C~55TQ      
2015 11  07.25971  01 17 29.042  -23 50 23.48  23.8i 14YZ91    W84  C~55TQ      
2015 11  07.26106  01 17 29.033  -23 50 23.51  23.8r 14YZ91    W84  C~55TQ      
2015 11  14.16438  01 16 57.251  -23 50 14.49  24.2g 14YZ91    W84  C~55TQ      
2015 11  14.20162  01 16 57.076  -23 50 14.24  23.2i 14YZ91    W84  C~55TQ      
2015 11  16.10915  01 16 48.807  -23 50 02.89  23.2r 14YZ91    W84  C~55TQ      
2015 11  18.18727  01 16 40.015  -23 49 46.17  23.3i 14YZ91    W84  C~55TQ      
2015 12  01.04874  01 15 52.796  -23 46 24.72  23.9r 14YZ91    W84  C~55TQ      
2016 10  05.23354  01 27 26.422  -23 10 15.47  23.4i 14YZ91    W84  C~55TQ      
2016 10  05.23492  01 27 26.413  -23 10 15.77  24.0g 14YZ91    W84  C~55TQ      
2016 11  05.25898  01 24 44.765  -23 20 34.21  23.5i 14YZ91    W84  C~55TQ      
2016 11  05.26035  01 24 44.757  -23 20 34.22  23.6r 14YZ91    W84  C~55TQ      
2016 12  02.05486  01 22 54.117  -23 16 33.66  23.2i 14YZ91    W84  C~55TQ      
2016 12  02.05624  01 22 54.128  -23 16 33.85  23.5r 14YZ91    W84  C~55TQ      
2017 09  26.26159  01 35 14.070  -22 33 17.16  23.9r 14YZ91    W84  C~55TQ      
2017 11  23.20649  01 30 26.751  -22 49 00.66  24.6i 14YZ91    W84  C~55TQ      
2017 12  07.05538  01 29 38.768  -22 44 36.23  24.3r 14YZ91    W84  C~55TQ      
2017 12  11.11363  01 29 27.760  -22 42 43.70  24.8g 14YZ91    W84  C~55TQ      
2018 09  09.40404  01 43 19.646  -21 48 13.68  23.8i 14YZ91    W84  C~55TQ      
2018 09  10.24758  01 43 16.537  -21 48 54.88  23.9r 14YZ91    W84  C~55TQ      
2018 09  10.24896  01 43 16.551  -21 48 54.70  24.5g 14YZ91    W84  C~55TQ      
2018 12  02.08595  01 36 47.308  -22 15 40.88  23.7r 14YZ91    W84  C~55TQ      
2018 12  02.08733  01 36 47.308  -22 15 40.62  24.2g 14YZ91    W84  C~55TQ      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

     1   0.0000      0.00     0.11       0.00     0.02
     2   0.0767    587.16    -0.11    1189.59    -0.07
     3   0.8931   7393.66     0.06   -2533.26    -0.10
     4   0.8931   7393.54     0.02   -2533.23    -0.11
     5   0.9120   7007.29    -0.03   -2329.38     0.05
     6   0.9121   7005.25    -0.09   -2328.08     0.15
     7   0.9174   6908.77     0.12   -2267.06     0.06
     8   0.9231   6808.26    -0.07   -2198.04     0.17
     9   0.9583   6317.99    -0.06   -1727.83    -0.09
    10   1.8048  15833.30     0.09   -4149.75     0.06
    11   1.8048  15833.04    -0.05   -4149.96    -0.16
    12   1.8897  13559.47     0.03   -3665.95    -0.05
    13   1.8897  13559.37     0.02   -3665.91    -0.05
    14   1.9631  12309.82    -0.01   -2750.49     0.20
    15   1.9631  12309.86     0.08   -2750.73    -0.10
    16   2.7795  22643.23    -0.02   -5242.15    -0.07
    17   2.9382  18650.65    -0.12   -4185.94     0.15
    18   2.9761  18183.70     0.03   -3638.96     0.03
    19   2.9872  18100.84    -0.03   -3467.54     0.00
    20   3.7327  29978.55    -0.18   -6141.17    -0.07
    21   3.7350  29919.45    -0.11   -6156.09    -0.02
    22   3.7350  29919.72     0.25   -6156.03     0.06
    23   3.9618  24304.71    -0.04   -4930.26    -0.10
    24   3.9618  24304.83     0.13   -4930.03     0.07

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

14YZ91    quality flag:2

Type:           2:1E  SCATNEAR  SCATNEAR

axisobj        48.392    48.415    48.369
ecceobj         0.278     0.278     0.278
incobj         30.010    30.010    30.010
qmin           34.541    34.287    34.365
qmax           61.969    62.357    62.204
amean          47.795    47.794    47.802
amin           47.111    47.100    47.120
amax           48.606    48.651    48.632
emean           0.258     0.260     0.256
emin            0.232     0.232     0.210
emax            0.279     0.283     0.282
imean          28.772    28.486    28.907
imin           28.316    27.875    28.280
imax           29.254    29.106    29.714
excite_mean     0.546     0.543     0.547
fracstop        1.000     1.000     1.000
cjmean          2.764     2.769     2.762

libcent 0       181.1    -180.0    -180.0
libamp  0       171.6    -180.0    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       211.1     188.3     182.5
kozaiamp        180.0     179.9     180.0