| Parameter |
Value |
| Designation |
C/2001 OG108 (LONEOS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-03-15T04:56:44.543040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:10Z |
| Obs used |
882 |
| NEO |
Yes |
| M1 |
13.300 |
| K1 |
11.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-12-05.0000000 |
| e |
0.92526008 |
| q (au) |
0.994048 |
| a (au) |
13.300093 |
| i (deg) |
80.245059 |
| Ω (om, deg) |
10.555290 |
| ω (w, deg) |
116.419511 |
| M (ma, deg) |
357.963820 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.668 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.668 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.831 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2001-08-27 |
2002-03-15 |
+6.7643 |
-0.411 |
| 2002-03-15 |
2002-04-29 |
+26.2855 |
-0.105 |
| 2002-04-29 |
2002-06-05 |
-11.8899 |
+2.380 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:22:46.07 |
-56:16:23.7 |
HIP 11123 |
16.59 |
| 2026-07-29 12:00 |
02:22:46.12 |
-56:17:25.4 |
HIP 11123 |
15.58 |
| 2026-07-30 00:00 |
02:22:46.10 |
-56:18:27.2 |
HIP 11123 |
14.57 |
| 2026-07-30 12:00 |
02:22:46.01 |
-56:19:29.0 |
HIP 11123 |
13.57 |
| 2026-07-31 00:00 |
02:22:45.86 |
-56:20:31.0 |
HIP 11123 |
12.58 |
| 2026-07-31 12:00 |
02:22:45.64 |
-56:21:33.0 |
HIP 11123 |
11.59 |
| 2026-08-01 00:00 |
02:22:45.35 |
-56:22:35.2 |
HIP 11123 |
10.61 |
| 2026-08-01 12:00 |
02:22:45.00 |
-56:23:37.3 |
HIP 11123 |
9.65 |
| 2026-08-02 00:00 |
02:22:44.58 |
-56:24:39.6 |
HIP 11123 |
8.70 |
| 2026-08-02 12:00 |
02:22:44.09 |
-56:25:41.9 |
HIP 11123 |
7.78 |
| 2026-08-03 00:00 |
02:22:43.54 |
-56:26:44.3 |
HIP 11123 |
6.90 |
| 2026-08-03 12:00 |
02:22:42.91 |
-56:27:46.8 |
HIP 11123 |
6.08 |
| 2026-08-04 00:00 |
02:22:42.22 |
-56:28:49.3 |
HIP 11123 |
5.35 |
| 2026-08-04 12:00 |
02:22:41.46 |
-56:29:51.8 |
HIP 11123 |
4.73 |
| 2026-08-05 00:00 |
02:22:40.64 |
-56:30:54.4 |
HIP 11123 |
4.30 |
| 2026-08-05 12:00 |
02:22:39.74 |
-56:31:57.1 |
HIP 11123 |
4.11 |
| 2026-08-06 00:00 |
02:22:38.78 |
-56:32:59.7 |
HIP 11123 |
4.19 |
| 2026-08-06 12:00 |
02:22:37.75 |
-56:34:02.4 |
HIP 11123 |
4.52 |
| 2026-08-07 00:00 |
02:22:36.65 |
-56:35:05.1 |
HIP 11123 |
5.07 |
| 2026-08-07 12:00 |
02:22:35.48 |
-56:36:07.9 |
HIP 11123 |
5.77 |
| 2026-08-08 00:00 |
02:22:34.24 |
-56:37:10.6 |
HIP 11123 |
6.58 |
| 2026-08-08 12:00 |
02:22:32.94 |
-56:38:13.4 |
HIP 11123 |
7.45 |
| 2026-08-09 00:00 |
02:22:31.56 |
-56:39:16.1 |
HIP 11123 |
8.37 |
| 2026-08-09 12:00 |
02:22:30.12 |
-56:40:18.9 |
HIP 11123 |
9.33 |
| 2026-08-10 00:00 |
02:22:28.61 |
-56:41:21.6 |
HIP 11123 |
10.31 |
| 2026-08-10 12:00 |
02:22:27.03 |
-56:42:24.4 |
HIP 11145 |
10.08 |
| 2026-08-11 00:00 |
02:22:25.38 |
-56:43:27.1 |
HIP 11145 |
9.64 |
| 2026-08-11 12:00 |
02:22:23.66 |
-56:44:29.8 |
HIP 11145 |
9.31 |
| 2026-08-12 00:00 |
02:22:21.87 |
-56:45:32.4 |
HIP 11145 |
9.10 |
| 2026-08-12 12:00 |
02:22:20.01 |
-56:46:35.1 |
HIP 11145 |
9.02 |
| 2026-08-13 00:00 |
02:22:18.08 |
-56:47:37.6 |
HIP 11145 |
9.08 |
| 2026-08-13 12:00 |
02:22:16.09 |
-56:48:40.2 |
HIP 11145 |
9.28 |
| 2026-08-14 00:00 |
02:22:14.02 |
-56:49:42.7 |
HIP 11145 |
9.60 |
| 2026-08-14 12:00 |
02:22:11.88 |
-56:50:45.1 |
HIP 11145 |
10.04 |
| 2026-08-15 00:00 |
02:22:09.68 |
-56:51:47.5 |
HIP 11145 |
10.58 |
| 2026-08-15 12:00 |
02:22:07.41 |
-56:52:49.8 |
HIP 11145 |
11.21 |
| 2026-08-16 00:00 |
02:22:05.06 |
-56:53:52.0 |
HIP 11145 |
11.91 |
| 2026-08-16 12:00 |
02:22:02.65 |
-56:54:54.1 |
HIP 11145 |
12.67 |
| 2026-08-17 00:00 |
02:22:00.17 |
-56:55:56.2 |
HIP 11145 |
13.48 |
| 2026-08-17 12:00 |
02:21:57.62 |
-56:56:58.1 |
HIP 11145 |
14.34 |
| 2026-08-18 00:00 |
02:21:55.01 |
-56:58:00.0 |
HIP 11145 |
15.23 |
| 2026-08-18 12:00 |
02:21:52.32 |
-56:59:01.8 |
HIP 11145 |
16.15 |
| 2026-08-19 00:00 |
02:21:49.57 |
-57:00:03.4 |
HIP 11145 |
17.10 |