C/2000 O1 (Koehn)
| Parameter |
Value |
| Designation |
C/2000 O1 (Koehn) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-01-27T17:38:15.144000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:05Z |
| Obs used |
64 |
| NEO |
- |
| M1 |
5.100 |
| K1 |
11.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-05-14.0000000 |
| e |
1.00000217 |
| q (au) |
5.921780 |
| a (au) |
-2729545.221721 |
| i (deg) |
148.104189 |
| Ω (om, deg) |
88.882672 |
| ω (w, deg) |
55.164253 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.023 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.023 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:12:09.77 |
-29:22:42.3 |
HIP 84131 |
6.42 |
| 2026-02-03 12:00 |
17:12:11.32 |
-29:22:49.2 |
HIP 84131 |
6.48 |
| 2026-02-04 00:00 |
17:12:12.85 |
-29:22:56.2 |
HIP 84131 |
6.55 |
| 2026-02-04 12:00 |
17:12:14.36 |
-29:23:03.1 |
HIP 84131 |
6.64 |
| 2026-02-05 00:00 |
17:12:15.85 |
-29:23:10.0 |
HIP 84131 |
6.74 |
| 2026-02-05 12:00 |
17:12:17.32 |
-29:23:17.0 |
HIP 84131 |
6.86 |
| 2026-02-06 00:00 |
17:12:18.77 |
-29:23:23.9 |
HIP 84131 |
6.98 |
| 2026-02-06 12:00 |
17:12:20.19 |
-29:23:30.9 |
HIP 84131 |
7.12 |
| 2026-02-07 00:00 |
17:12:21.59 |
-29:23:37.8 |
HIP 84131 |
7.26 |
| 2026-02-07 12:00 |
17:12:22.97 |
-29:23:44.7 |
HIP 84131 |
7.42 |
| 2026-02-08 00:00 |
17:12:24.33 |
-29:23:51.6 |
HIP 84131 |
7.58 |
| 2026-02-08 12:00 |
17:12:25.66 |
-29:23:58.6 |
HIP 84131 |
7.74 |
| 2026-02-09 00:00 |
17:12:26.98 |
-29:24:05.5 |
HIP 84131 |
7.91 |
| 2026-02-09 12:00 |
17:12:28.26 |
-29:24:12.4 |
HIP 84131 |
8.09 |
| 2026-02-10 00:00 |
17:12:29.53 |
-29:24:19.3 |
HIP 84131 |
8.26 |
| 2026-02-10 12:00 |
17:12:30.77 |
-29:24:26.2 |
HIP 84131 |
8.44 |
| 2026-02-11 00:00 |
17:12:31.99 |
-29:24:33.1 |
HIP 84131 |
8.62 |
| 2026-02-11 12:00 |
17:12:33.19 |
-29:24:40.0 |
HIP 84131 |
8.81 |
| 2026-02-12 00:00 |
17:12:34.36 |
-29:24:46.8 |
HIP 84131 |
8.99 |
| 2026-02-12 12:00 |
17:12:35.51 |
-29:24:53.7 |
HIP 84131 |
9.17 |
| 2026-02-13 00:00 |
17:12:36.63 |
-29:25:00.6 |
HIP 84131 |
9.36 |
| 2026-02-13 12:00 |
17:12:37.73 |
-29:25:07.4 |
HIP 84131 |
9.54 |
| 2026-02-14 00:00 |
17:12:38.81 |
-29:25:14.3 |
HIP 84131 |
9.72 |
| 2026-02-14 12:00 |
17:12:39.86 |
-29:25:21.1 |
HIP 84131 |
9.90 |
| 2026-02-15 00:00 |
17:12:40.89 |
-29:25:28.0 |
HIP 84131 |
10.08 |
| 2026-02-15 12:00 |
17:12:41.90 |
-29:25:34.8 |
HIP 84131 |
10.26 |
| 2026-02-16 00:00 |
17:12:42.88 |
-29:25:41.6 |
HIP 84131 |
10.43 |
| 2026-02-16 12:00 |
17:12:43.83 |
-29:25:48.4 |
HIP 84131 |
10.60 |
| 2026-02-17 00:00 |
17:12:44.76 |
-29:25:55.2 |
HIP 84131 |
10.77 |
| 2026-02-17 12:00 |
17:12:45.67 |
-29:26:02.0 |
HIP 84131 |
10.94 |
| 2026-02-18 00:00 |
17:12:46.55 |
-29:26:08.8 |
HIP 84131 |
11.10 |
| 2026-02-18 12:00 |
17:12:47.40 |
-29:26:15.5 |
HIP 84222 |
11.10 |
| 2026-02-19 00:00 |
17:12:48.23 |
-29:26:22.3 |
HIP 84222 |
10.96 |
| 2026-02-19 12:00 |
17:12:49.04 |
-29:26:29.0 |
HIP 84222 |
10.82 |
| 2026-02-20 00:00 |
17:12:49.82 |
-29:26:35.7 |
HIP 84222 |
10.68 |
| 2026-02-20 12:00 |
17:12:50.58 |
-29:26:42.4 |
HIP 84222 |
10.55 |
| 2026-02-21 00:00 |
17:12:51.31 |
-29:26:49.1 |
HIP 84222 |
10.43 |
| 2026-02-21 12:00 |
17:12:52.01 |
-29:26:55.8 |
HIP 84222 |
10.30 |
| 2026-02-22 00:00 |
17:12:52.69 |
-29:27:02.5 |
HIP 84222 |
10.18 |
| 2026-02-22 12:00 |
17:12:53.34 |
-29:27:09.2 |
HIP 84222 |
10.06 |
| 2026-02-23 00:00 |
17:12:53.97 |
-29:27:15.8 |
HIP 84222 |
9.94 |
| 2026-02-23 12:00 |
17:12:54.57 |
-29:27:22.4 |
HIP 84222 |
9.82 |
| 2026-02-24 00:00 |
17:12:55.15 |
-29:27:29.0 |
HIP 84222 |
9.71 |