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: 15DQ248 # Created Tue Apr 1 01:10:19 2025 # Orbit generated from Bernstein formalism # Fitting 30 observations of 31 # Arc: 1.95y # First observation: 2015/02/17 # Last observation: 2017/01/28 Preliminary a, adot, b, bdot, g, gdot: -0.000081 0.032638 0.000001 0.017405 0.027534 0.000000 # Chi-squared of fit: 27.22 DOF: 54 RMS: 0.17 # Min/Max residuals: -0.41 0.37 # Exact a, adot, b, bdot, g, gdot: 1.846619E-05 3.206983E-02 1.001912E-05 1.728987E-02 2.873150E-02 -4.023993E-03 # Covariance matrix: 1.7677E-13 2.8453E-12 -1.8952E-14 1.5100E-12 1.7703E-12 4.4499E-11 2.8453E-12 1.1817E-10 -7.3962E-13 6.0634E-11 6.3514E-11 1.7840E-09 -1.8952E-14 -7.3962E-13 9.7437E-14 -4.2981E-13 -4.1128E-13 -1.1221E-11 1.5100E-12 6.0634E-11 -4.2981E-13 3.1225E-11 3.3003E-11 9.1726E-10 1.7703E-12 6.3514E-11 -4.1128E-13 3.3003E-11 3.7650E-11 9.7220E-10 4.4499E-11 1.7840E-09 -1.1221E-11 9.1726E-10 9.7220E-10 2.6992E-08 # lat0 lon0 xBary yBary zBary JD0 -16.428115 143.425305 -0.075741 -0.277620 -0.942241 2457070.617378 # Heliocentric elements and errors Epoch: 2457070.5000 = 2015/02/17 Mean Anomaly: 354.43217 +/- 0.218 Argument of Peri: 347.21354 +/- 0.742 Long of Asc Node: 170.58778 +/- 0.002 Inclination: 32.21561 +/- 0.002 Eccentricity: 0.48759925 +/- 0.0021 Semi-Major Axis: 68.61409029 +/- 0.1996 Time of Perihelion: 2460281.2132 +/- 124.8 Perihelion: 35.15791112 +/- 0.1763 Aphelion: 102.07026946 +/- 0.3298 Period (y) 568.3661 +/- 2.48 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.64760180 +/- 0.0057 Ecliptic Y 20.41722814 +/- 0.0043 Ecliptic Z -9.84299445 +/- 0.0021 Ecliptic XDOT -0.00190344 +/- 0.0000 Ecliptic YDOT -0.00240126 +/- 0.0000 Ecliptic ZDOT 0.00168884 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.75105076 +/- 0.0051 Geocenter to KBO 34.80500728 +/- 0.0074 # Hcoef: 8.34
The following table shows the complete astrometric record for 15DQ248. 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 (15DQ248) followed by the observatory code and reference code for the source of the astrometry.
2015 02 17.11660 09 21 39.88 -01 50 28.0 24.2g 15DQ248 W84 C~2iOU 2015 02 17.20175 09 21 39.46 -01 50 24.7 23.7g 15DQ248 W84 C~2iOU 2015 02 17.27039 09 21 39.10 -01 50 22.3 24.2g 15DQ248 W84 C~2iOU 2015 02 18.04539 09 21 35.15 -01 49 52.4 24.3g 15DQ248 W84 C~2iOU 2015 02 18.11316 09 21 34.82 -01 49 49.7 24.0g 15DQ248 W84 C~2iOU 2015 02 18.18080 09 21 34.44 -01 49 47.0 24.0g 15DQ248 W84 C~2iOU 2015 02 18.24913 09 21 34.13 -01 49 44.4 24.0g 15DQ248 W84 C~2iOU 2015 02 18.31961 09 21 33.75 -01 49 41.7 24.2g 15DQ248 W84 C~2iOU 2015 02 19.31659 09 21 28.67 -01 49 02.7 15DQ248 W84 C~2iOU 2015 02 22.03469 09 21 15.01 -01 47 15.1 15DQ248 W84 C~2iOU 2015 02 22.10229 09 21 14.68 -01 47 12.1 15DQ248 W84 C~2iOU 2015 02 22.16972 09 21 14.36 -01 47 09.8 15DQ248 W84 C~2iOU 2015 02 24.08705 09 21 04.90 -01 45 51.9 15DQ248 W84 C~2iOU 2015 02 24.14784 09 21 04.57 -01 45 49.2 15DQ248 W84 C~2iOU 2015 02 27.030644 09 20 50.55 -01 43 50.0 15DQ248 W84 C~5iaL 2015 02 27.078925 09 20 50.32 -01 43 48.1 15DQ248 W84 C~5iaL 2015 02 27.146499 09 20 49.95 -01 43 44.8 15DQ248 W84 C~5iaL 2016 12 25.47498 09 42 14.42 -01 28 08.4 24.2r 15DQ248 T09 C~7uhE 2016 12 25.47707 09 42 14.40 -01 28 08.1 24.1r 15DQ248 T09 C~7uhE 2016 12 25.48752 09 42 14.37 -01 28 08.3 23.9r 15DQ248 T09 C~7uhE 2017 01 21.37468 09 40 29.43 -01 21 46.4 23.9z 15DQ248 T09 C~7uhE 2017 01 21.40688 09 40 29.28 -01 21 45.7 23.4z 15DQ248 T09 C~7uhE 2017 01 21.56385 09 40 28.52 -01 21 42.0 23.4z 15DQ248 T09 C~7uhE 2017 01 21.62179 09 40 28.24 -01 21 40.7 23.5z 15DQ248 T09 C~7uhE 2017 01 21.62985 09 40 28.20 -01 21 40.5 23.7z 15DQ248 T09 C~7uhE 2017 01 21.63790 09 40 28.15 -01 21 40.0 23.9z 15DQ248 T09 C~7uhE 2017 01 28.38299 09 39 55.38 -01 18 44.1 24.3g 15DQ248 T09 C~7uhE 2017 01 28.39348 09 39 55.33 -01 18 44.3 24.6g 15DQ248 T09 C~7uhE 2017 01 28.41043 09 39 55.25 -01 18 43.3 24.6g 15DQ248 T09 C~7uhE 2017 01 28.41954 09 39 55.19 -01 18 43.4 24.5g 15DQ248 T09 C~7uhE 2017 01 28.45084 09 39 55.04 -01 18 42.4 24.4g 15DQ248 T09 C~7uhE
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 -0.17 0.00 -0.10
2 0.0002 -7.02 0.14 1.11 0.05
3 0.0004 -12.90 0.17 1.66 -0.18
4 0.0025 -78.57 -0.08 11.07 -0.14
5 0.0027 -84.12 0.18 12.04 0.04
6 0.0029 -90.38 -0.27 12.78 -0.02
7 0.0031 -95.62 0.37 13.76 0.15
8 0.0033 -101.88 0.14 14.50 0.04
9 0.0060 -186.51 -0.20 27.11 0.13
10 0.0135 -414.96 -0.37 63.60 -0.15
11 0.0137 -420.61 -0.29 64.86 0.17
12 0.0138 -425.89 0.16 65.51 -0.11
13 0.0191 -585.18 ( 0.57) 93.98 ( 0.11)
14 0.0193 -590.73 0.14 94.95 0.19
15 0.0271 -828.02 0.18 140.70 -0.04
16 0.0273 -831.89 0.30 141.39 -0.13
17 0.0275 -838.20 -0.41 142.75 0.13
18 1.8545 17167.30 0.17 7181.82 -0.20
19 1.8545 17166.91 -0.12 7182.01 0.01
20 1.8545 17166.55 -0.02 7181.67 -0.22
21 1.9282 15541.77 -0.00 7041.73 0.17
22 1.9282 15539.40 0.08 7041.68 0.13
23 1.9287 15527.34 0.04 7041.56 0.08
24 1.9288 15522.92 0.05 7041.45 -0.01
25 1.9289 15522.29 0.03 7041.45 -0.01
26 1.9289 15521.41 -0.23 7041.68 0.23
27 1.9473 14996.43 -0.10 7051.85 0.14
28 1.9474 14995.78 0.11 7051.42 -0.31
29 1.9474 14994.31 0.03 7051.99 0.21
30 1.9474 14993.49 -0.06 7051.60 -0.19
31 1.9475 14991.02 0.03 7051.83 -0.04
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.
15DQ248 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 67.990 68.257 67.763 ecceobj 0.482 0.485 0.479 incobj 32.290 32.295 32.286 qmin 33.474 32.762 32.980 qmax 103.494 105.266 104.380 amean 67.742 68.079 67.624 amin 66.878 67.174 66.691 amax 69.027 69.389 68.956 emean 0.483 0.497 0.492 emin 0.467 0.476 0.468 emax 0.505 0.519 0.514 imean 31.417 30.795 30.800 imin 30.476 29.706 29.933 imax 32.181 31.844 31.949 excite_mean 0.711 0.714 0.710 fracstop 1.000 1.000 1.000 cjmean 2.685 2.683 2.687 libcent 0 -180.0 -180.0 -180.0 libamp 0 -180.0 -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 130.3 113.2 164.8 kozaiamp 180.0 180.0 180.0