C/2000 OF8 (Spacewatch)
| Parameter |
Value |
| Designation |
C/2000 OF8 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-08-04T19:13:02.890560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:05Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-09-24.0000000 |
| e |
1.00180402 |
| q (au) |
2.172785 |
| a (au) |
-1204.412900 |
| i (deg) |
152.432608 |
| Ω (om, deg) |
117.090492 |
| ω (w, deg) |
256.080338 |
| M (ma, deg) |
-0.007423 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.880 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.880 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:12:58.18 |
+42:55:27.2 |
HIP 19628 |
6.94 |
| 2026-02-03 12:00 |
04:12:56.73 |
+42:55:11.4 |
HIP 19628 |
6.65 |
| 2026-02-04 00:00 |
04:12:55.32 |
+42:54:55.6 |
HIP 19628 |
6.37 |
| 2026-02-04 12:00 |
04:12:53.93 |
+42:54:39.8 |
HIP 19628 |
6.10 |
| 2026-02-05 00:00 |
04:12:52.57 |
+42:54:24.1 |
HIP 19628 |
5.85 |
| 2026-02-05 12:00 |
04:12:51.24 |
+42:54:08.3 |
HIP 19628 |
5.61 |
| 2026-02-06 00:00 |
04:12:49.95 |
+42:53:52.6 |
HIP 19628 |
5.40 |
| 2026-02-06 12:00 |
04:12:48.68 |
+42:53:36.9 |
HIP 19628 |
5.21 |
| 2026-02-07 00:00 |
04:12:47.44 |
+42:53:21.2 |
HIP 19628 |
5.03 |
| 2026-02-07 12:00 |
04:12:46.23 |
+42:53:05.5 |
HIP 19628 |
4.89 |
| 2026-02-08 00:00 |
04:12:45.05 |
+42:52:49.9 |
HIP 19628 |
4.76 |
| 2026-02-08 12:00 |
04:12:43.90 |
+42:52:34.3 |
HIP 19628 |
4.66 |
| 2026-02-09 00:00 |
04:12:42.78 |
+42:52:18.7 |
HIP 19628 |
4.59 |
| 2026-02-09 12:00 |
04:12:41.70 |
+42:52:03.1 |
HIP 19628 |
4.55 |
| 2026-02-10 00:00 |
04:12:40.64 |
+42:51:47.6 |
HIP 19628 |
4.54 |
| 2026-02-10 12:00 |
04:12:39.61 |
+42:51:32.1 |
HIP 19628 |
4.55 |
| 2026-02-11 00:00 |
04:12:38.61 |
+42:51:16.6 |
HIP 19628 |
4.59 |
| 2026-02-11 12:00 |
04:12:37.65 |
+42:51:01.2 |
HIP 19628 |
4.65 |
| 2026-02-12 00:00 |
04:12:36.71 |
+42:50:45.8 |
HIP 19628 |
4.73 |
| 2026-02-12 12:00 |
04:12:35.80 |
+42:50:30.4 |
HIP 19628 |
4.84 |
| 2026-02-13 00:00 |
04:12:34.93 |
+42:50:15.1 |
HIP 19628 |
4.96 |
| 2026-02-13 12:00 |
04:12:34.08 |
+42:49:59.8 |
HIP 19628 |
5.11 |
| 2026-02-14 00:00 |
04:12:33.27 |
+42:49:44.5 |
HIP 19628 |
5.26 |
| 2026-02-14 12:00 |
04:12:32.48 |
+42:49:29.3 |
HIP 19628 |
5.43 |
| 2026-02-15 00:00 |
04:12:31.73 |
+42:49:14.1 |
HIP 19628 |
5.62 |
| 2026-02-15 12:00 |
04:12:31.01 |
+42:48:59.0 |
HIP 19628 |
5.81 |
| 2026-02-16 00:00 |
04:12:30.32 |
+42:48:43.9 |
HIP 19628 |
6.01 |
| 2026-02-16 12:00 |
04:12:29.66 |
+42:48:28.8 |
HIP 19628 |
6.21 |
| 2026-02-17 00:00 |
04:12:29.03 |
+42:48:13.8 |
HIP 19628 |
6.43 |
| 2026-02-17 12:00 |
04:12:28.43 |
+42:47:58.8 |
HIP 19628 |
6.64 |
| 2026-02-18 00:00 |
04:12:27.86 |
+42:47:43.9 |
HIP 19628 |
6.87 |
| 2026-02-18 12:00 |
04:12:27.32 |
+42:47:29.1 |
HIP 19628 |
7.09 |
| 2026-02-19 00:00 |
04:12:26.81 |
+42:47:14.3 |
HIP 19628 |
7.32 |
| 2026-02-19 12:00 |
04:12:26.34 |
+42:46:59.5 |
HIP 19628 |
7.55 |
| 2026-02-20 00:00 |
04:12:25.89 |
+42:46:44.8 |
HIP 19628 |
7.78 |
| 2026-02-20 12:00 |
04:12:25.48 |
+42:46:30.2 |
HIP 19628 |
8.02 |
| 2026-02-21 00:00 |
04:12:25.09 |
+42:46:15.6 |
HIP 19628 |
8.25 |
| 2026-02-21 12:00 |
04:12:24.74 |
+42:46:01.0 |
HIP 19628 |
8.48 |
| 2026-02-22 00:00 |
04:12:24.42 |
+42:45:46.6 |
HIP 19628 |
8.72 |
| 2026-02-22 12:00 |
04:12:24.13 |
+42:45:32.2 |
HIP 19628 |
8.96 |
| 2026-02-23 00:00 |
04:12:23.86 |
+42:45:17.8 |
HIP 19628 |
9.19 |
| 2026-02-23 12:00 |
04:12:23.63 |
+42:45:03.5 |
HIP 19628 |
9.43 |
| 2026-02-24 00:00 |
04:12:23.43 |
+42:44:49.3 |
HIP 19628 |
9.66 |