| 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) |
| 2026-06-01 00:00 |
02:16:11.04 |
-54:46:01.8 |
HIP 10461 |
22.05 |
| 2026-06-01 12:00 |
02:16:17.06 |
-54:46:26.6 |
HIP 10779 |
21.78 |
| 2026-06-02 00:00 |
02:16:23.04 |
-54:46:51.9 |
HIP 10779 |
20.84 |
| 2026-06-02 12:00 |
02:16:28.99 |
-54:47:17.6 |
HIP 10779 |
19.91 |
| 2026-06-03 00:00 |
02:16:34.91 |
-54:47:43.8 |
HIP 10779 |
18.98 |
| 2026-06-03 12:00 |
02:16:40.80 |
-54:48:10.5 |
HIP 10779 |
18.06 |
| 2026-06-04 00:00 |
02:16:46.65 |
-54:48:37.6 |
HIP 10779 |
17.15 |
| 2026-06-04 12:00 |
02:16:52.47 |
-54:49:05.2 |
HIP 10779 |
16.25 |
| 2026-06-05 00:00 |
02:16:58.26 |
-54:49:33.2 |
HIP 10779 |
15.35 |
| 2026-06-05 12:00 |
02:17:04.01 |
-54:50:01.8 |
HIP 10779 |
14.47 |
| 2026-06-06 00:00 |
02:17:09.73 |
-54:50:30.7 |
HIP 10779 |
13.61 |
| 2026-06-06 12:00 |
02:17:15.42 |
-54:51:00.2 |
HIP 10779 |
12.76 |
| 2026-06-07 00:00 |
02:17:21.06 |
-54:51:30.1 |
HIP 10779 |
11.93 |
| 2026-06-07 12:00 |
02:17:26.68 |
-54:52:00.4 |
HIP 10779 |
11.13 |
| 2026-06-08 00:00 |
02:17:32.25 |
-54:52:31.2 |
HIP 10779 |
10.36 |
| 2026-06-08 12:00 |
02:17:37.79 |
-54:53:02.5 |
HIP 10779 |
9.63 |
| 2026-06-09 00:00 |
02:17:43.30 |
-54:53:34.2 |
HIP 10779 |
8.95 |
| 2026-06-09 12:00 |
02:17:48.76 |
-54:54:06.4 |
HIP 10779 |
8.33 |
| 2026-06-10 00:00 |
02:17:54.19 |
-54:54:39.0 |
HIP 10779 |
7.78 |
| 2026-06-10 12:00 |
02:17:59.58 |
-54:55:12.0 |
HIP 10779 |
7.33 |
| 2026-06-11 00:00 |
02:18:04.93 |
-54:55:45.5 |
HIP 10779 |
6.99 |
| 2026-06-11 12:00 |
02:18:10.25 |
-54:56:19.4 |
HIP 10779 |
6.78 |
| 2026-06-12 00:00 |
02:18:15.52 |
-54:56:53.8 |
HIP 10779 |
6.70 |
| 2026-06-12 12:00 |
02:18:20.75 |
-54:57:28.6 |
HIP 10779 |
6.77 |
| 2026-06-13 00:00 |
02:18:25.95 |
-54:58:03.9 |
HIP 10779 |
6.97 |
| 2026-06-13 12:00 |
02:18:31.10 |
-54:58:39.6 |
HIP 10779 |
7.31 |
| 2026-06-14 00:00 |
02:18:36.21 |
-54:59:15.7 |
HIP 10779 |
7.75 |
| 2026-06-14 12:00 |
02:18:41.28 |
-54:59:52.2 |
HIP 10779 |
8.29 |
| 2026-06-15 00:00 |
02:18:46.31 |
-55:00:29.2 |
HIP 10852 |
7.76 |
| 2026-06-15 12:00 |
02:18:51.29 |
-55:01:06.6 |
HIP 10852 |
7.02 |
| 2026-06-16 00:00 |
02:18:56.24 |
-55:01:44.4 |
HIP 10852 |
6.35 |
| 2026-06-16 12:00 |
02:19:01.14 |
-55:02:22.6 |
HIP 10852 |
5.77 |
| 2026-06-17 00:00 |
02:19:05.99 |
-55:03:01.2 |
HIP 10852 |
5.30 |
| 2026-06-17 12:00 |
02:19:10.81 |
-55:03:40.3 |
HIP 10852 |
4.98 |
| 2026-06-18 00:00 |
02:19:15.57 |
-55:04:19.7 |
HIP 10852 |
4.84 |
| 2026-06-18 12:00 |
02:19:20.30 |
-55:04:59.6 |
HIP 10852 |
4.89 |
| 2026-06-19 00:00 |
02:19:24.97 |
-55:05:39.9 |
HIP 10852 |
5.12 |
| 2026-06-19 12:00 |
02:19:29.61 |
-55:06:20.6 |
HIP 10852 |
5.53 |
| 2026-06-20 00:00 |
02:19:34.19 |
-55:07:01.6 |
HIP 10852 |
6.06 |
| 2026-06-20 12:00 |
02:19:38.74 |
-55:07:43.1 |
HIP 10852 |
6.69 |
| 2026-06-21 00:00 |
02:19:43.23 |
-55:08:24.9 |
HIP 10852 |
7.40 |
| 2026-06-21 12:00 |
02:19:47.68 |
-55:09:07.2 |
HIP 10852 |
8.16 |
| 2026-06-22 00:00 |
02:19:52.08 |
-55:09:49.8 |
HIP 10852 |
8.96 |