| Parameter |
Value |
| Designation |
C/2002 O4 (Hoenig) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-10-01T23:33:55.399680Z |
| Orbit solution date (soln_date, UTC) |
2021-11-20T19:12:51Z |
| Obs used |
1195 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-08-13.0000000 |
| e |
1.00085552 |
| q (au) |
0.776209 |
| a (au) |
-907.293712 |
| i (deg) |
73.126827 |
| Ω (om, deg) |
321.040639 |
| ω (w, deg) |
105.936774 |
| M (ma, deg) |
-0.001803 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.577 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.577 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2002-07-22 |
2002-08-14 |
+37.8142 |
-4.484 |
| 2002-08-14 |
2002-10-01 |
-12.0631 |
+0.022 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
08:43:12.52 |
-75:58:41.7 |
HIP 43008 |
10.95 |
| 2026-05-12 12:00 |
08:43:14.65 |
-75:58:04.8 |
HIP 43008 |
10.57 |
| 2026-05-13 00:00 |
08:43:16.86 |
-75:57:28.0 |
HIP 43008 |
10.22 |
| 2026-05-13 12:00 |
08:43:19.16 |
-75:56:51.2 |
HIP 43008 |
9.88 |
| 2026-05-14 00:00 |
08:43:21.54 |
-75:56:14.5 |
HIP 43008 |
9.57 |
| 2026-05-14 12:00 |
08:43:24.00 |
-75:55:37.9 |
HIP 43008 |
9.29 |
| 2026-05-15 00:00 |
08:43:26.54 |
-75:55:01.4 |
HIP 43008 |
9.04 |
| 2026-05-15 12:00 |
08:43:29.16 |
-75:54:24.9 |
HIP 43008 |
8.82 |
| 2026-05-16 00:00 |
08:43:31.86 |
-75:53:48.6 |
HIP 43008 |
8.63 |
| 2026-05-16 12:00 |
08:43:34.64 |
-75:53:12.3 |
HIP 43008 |
8.48 |
| 2026-05-17 00:00 |
08:43:37.50 |
-75:52:36.1 |
HIP 43008 |
8.37 |
| 2026-05-17 12:00 |
08:43:40.44 |
-75:52:00.0 |
HIP 43008 |
8.31 |
| 2026-05-18 00:00 |
08:43:43.46 |
-75:51:24.0 |
HIP 43008 |
8.28 |
| 2026-05-18 12:00 |
08:43:46.56 |
-75:50:48.1 |
HIP 43008 |
8.30 |
| 2026-05-19 00:00 |
08:43:49.73 |
-75:50:12.3 |
HIP 43008 |
8.35 |
| 2026-05-19 12:00 |
08:43:52.99 |
-75:49:36.6 |
HIP 43008 |
8.45 |
| 2026-05-20 00:00 |
08:43:56.32 |
-75:49:01.0 |
HIP 43008 |
8.59 |
| 2026-05-20 12:00 |
08:43:59.72 |
-75:48:25.6 |
HIP 43008 |
8.77 |
| 2026-05-21 00:00 |
08:44:03.20 |
-75:47:50.2 |
HIP 43008 |
8.98 |
| 2026-05-21 12:00 |
08:44:06.76 |
-75:47:14.9 |
HIP 43008 |
9.22 |
| 2026-05-22 00:00 |
08:44:10.39 |
-75:46:39.8 |
HIP 43008 |
9.50 |
| 2026-05-22 12:00 |
08:44:14.10 |
-75:46:04.8 |
HIP 43008 |
9.80 |
| 2026-05-23 00:00 |
08:44:17.88 |
-75:45:29.9 |
HIP 43008 |
10.13 |
| 2026-05-23 12:00 |
08:44:21.74 |
-75:44:55.1 |
HIP 43008 |
10.48 |
| 2026-05-24 00:00 |
08:44:25.66 |
-75:44:20.5 |
HIP 43008 |
10.85 |
| 2026-05-24 12:00 |
08:44:29.66 |
-75:43:45.9 |
HIP 43008 |
11.24 |
| 2026-05-25 00:00 |
08:44:33.74 |
-75:43:11.6 |
HIP 43008 |
11.65 |
| 2026-05-25 12:00 |
08:44:37.88 |
-75:42:37.3 |
HIP 43008 |
12.07 |
| 2026-05-26 00:00 |
08:44:42.09 |
-75:42:03.2 |
HIP 43008 |
12.51 |
| 2026-05-26 12:00 |
08:44:46.38 |
-75:41:29.2 |
HIP 43008 |
12.95 |
| 2026-05-27 00:00 |
08:44:50.74 |
-75:40:55.3 |
HIP 43008 |
13.41 |
| 2026-05-27 12:00 |
08:44:55.16 |
-75:40:21.6 |
HIP 43008 |
13.88 |
| 2026-05-28 00:00 |
08:44:59.66 |
-75:39:48.1 |
HIP 43008 |
14.35 |
| 2026-05-28 12:00 |
08:45:04.22 |
-75:39:14.6 |
HIP 43008 |
14.83 |
| 2026-05-29 00:00 |
08:45:08.85 |
-75:38:41.4 |
HIP 43008 |
15.32 |
| 2026-05-29 12:00 |
08:45:13.55 |
-75:38:08.2 |
HIP 43008 |
15.82 |
| 2026-05-30 00:00 |
08:45:18.32 |
-75:37:35.3 |
HIP 43008 |
16.32 |
| 2026-05-30 12:00 |
08:45:23.15 |
-75:37:02.4 |
HIP 43008 |
16.83 |
| 2026-05-31 00:00 |
08:45:28.06 |
-75:36:29.8 |
HIP 43008 |
17.34 |
| 2026-05-31 12:00 |
08:45:33.02 |
-75:35:57.2 |
HIP 43008 |
17.86 |
| 2026-06-01 00:00 |
08:45:38.06 |
-75:35:24.9 |
HIP 43386 |
17.73 |
| 2026-06-01 12:00 |
08:45:43.15 |
-75:34:52.7 |
HIP 43386 |
17.57 |
| 2026-06-02 00:00 |
08:45:48.32 |
-75:34:20.7 |
HIP 43386 |
17.41 |