P/2009 O3 (Hill)
| Parameter |
Value |
| Designation |
P/2009 O3 (Hill) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-05-18T14:30:19.399680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:31Z |
| Obs used |
328 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-09-08.0000000 |
| e |
0.68688005 |
| q (au) |
2.449980 |
| a (au) |
7.824412 |
| i (deg) |
16.217527 |
| Ω (om, deg) |
183.763869 |
| ω (w, deg) |
154.552199 |
| M (ma, deg) |
5.061460 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.999 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.999 |
| n |
2.000 |
| gf |
0.970 |
| gb |
-0.965 |
| k |
1.000 |
| δ90 |
8.163 |
| 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 |
12:45:53.27 |
-03:43:12.8 |
HIP 62233 |
13.32 |
| 2026-02-03 12:00 |
12:45:49.92 |
-03:42:37.3 |
HIP 62233 |
13.23 |
| 2026-02-04 00:00 |
12:45:46.48 |
-03:42:01.2 |
HIP 62233 |
13.22 |
| 2026-02-04 12:00 |
12:45:42.95 |
-03:41:24.5 |
HIP 62233 |
13.28 |
| 2026-02-05 00:00 |
12:45:39.33 |
-03:40:47.2 |
HIP 62233 |
13.43 |
| 2026-02-05 12:00 |
12:45:35.62 |
-03:40:09.4 |
HIP 62233 |
13.67 |
| 2026-02-06 00:00 |
12:45:31.83 |
-03:39:30.9 |
HIP 62233 |
14.00 |
| 2026-02-06 12:00 |
12:45:27.94 |
-03:38:51.9 |
HIP 62233 |
14.41 |
| 2026-02-07 00:00 |
12:45:23.96 |
-03:38:12.3 |
HIP 62233 |
14.92 |
| 2026-02-07 12:00 |
12:45:19.90 |
-03:37:32.2 |
HIP 62233 |
15.50 |
| 2026-02-08 00:00 |
12:45:15.75 |
-03:36:51.5 |
HIP 62233 |
16.17 |
| 2026-02-08 12:00 |
12:45:11.51 |
-03:36:10.2 |
HIP 62233 |
16.91 |
| 2026-02-09 00:00 |
12:45:07.18 |
-03:35:28.4 |
HIP 62233 |
17.73 |
| 2026-02-09 12:00 |
12:45:02.76 |
-03:34:46.0 |
HIP 62233 |
18.61 |
| 2026-02-10 00:00 |
12:44:58.26 |
-03:34:03.1 |
HIP 62233 |
19.55 |
| 2026-02-10 12:00 |
12:44:53.67 |
-03:33:19.6 |
HIP 62233 |
20.55 |
| 2026-02-11 00:00 |
12:44:49.00 |
-03:32:35.5 |
HIP 62233 |
21.61 |
| 2026-02-11 12:00 |
12:44:44.23 |
-03:31:50.9 |
HIP 62233 |
22.71 |
| 2026-02-12 00:00 |
12:44:39.39 |
-03:31:05.8 |
HIP 62233 |
23.87 |
| 2026-02-12 12:00 |
12:44:34.46 |
-03:30:20.1 |
HIP 62233 |
25.07 |
| 2026-02-13 00:00 |
12:44:29.44 |
-03:29:33.8 |
HIP 62233 |
26.31 |
| 2026-02-13 12:00 |
12:44:24.34 |
-03:28:47.1 |
HIP 62233 |
27.59 |
| 2026-02-14 00:00 |
12:44:19.16 |
-03:27:59.8 |
HIP 62160 |
27.92 |
| 2026-02-14 12:00 |
12:44:13.89 |
-03:27:12.0 |
HIP 62160 |
27.20 |
| 2026-02-15 00:00 |
12:44:08.55 |
-03:26:23.6 |
HIP 62160 |
26.53 |
| 2026-02-15 12:00 |
12:44:03.12 |
-03:25:34.8 |
HIP 62160 |
25.94 |
| 2026-02-16 00:00 |
12:43:57.60 |
-03:24:45.4 |
HIP 62160 |
25.43 |
| 2026-02-16 12:00 |
12:43:52.01 |
-03:23:55.5 |
HIP 62160 |
25.01 |
| 2026-02-17 00:00 |
12:43:46.34 |
-03:23:05.1 |
HIP 62160 |
24.69 |
| 2026-02-17 12:00 |
12:43:40.59 |
-03:22:14.2 |
HIP 62160 |
24.48 |
| 2026-02-18 00:00 |
12:43:34.76 |
-03:21:22.8 |
HIP 62160 |
24.38 |
| 2026-02-18 12:00 |
12:43:28.85 |
-03:20:30.9 |
HIP 62160 |
24.41 |
| 2026-02-19 00:00 |
12:43:22.86 |
-03:19:38.5 |
HIP 62160 |
24.56 |
| 2026-02-19 12:00 |
12:43:16.80 |
-03:18:45.6 |
HIP 62160 |
24.83 |
| 2026-02-20 00:00 |
12:43:10.66 |
-03:17:52.3 |
HIP 62160 |
25.23 |
| 2026-02-20 12:00 |
12:43:04.44 |
-03:16:58.4 |
HIP 62160 |
25.76 |
| 2026-02-21 00:00 |
12:42:58.15 |
-03:16:04.1 |
HIP 62160 |
26.41 |
| 2026-02-21 12:00 |
12:42:51.79 |
-03:15:09.4 |
HIP 62160 |
27.17 |
| 2026-02-22 00:00 |
12:42:45.35 |
-03:14:14.2 |
HIP 62160 |
28.05 |
| 2026-02-22 12:00 |
12:42:38.84 |
-03:13:18.5 |
HIP 62160 |
29.03 |
| 2026-02-23 00:00 |
12:42:32.25 |
-03:12:22.4 |
HIP 61953 |
29.31 |
| 2026-02-23 12:00 |
12:42:25.60 |
-03:11:25.8 |
HIP 61953 |
27.85 |
| 2026-02-24 00:00 |
12:42:18.88 |
-03:10:28.8 |
HIP 61953 |
26.45 |