C/2003 O1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2003 O1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-03-17T04:58:20.317440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:31Z |
| Obs used |
550 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-04-21.0000000 |
| e |
1.00138883 |
| q (au) |
6.847362 |
| a (au) |
-4930.310760 |
| i (deg) |
117.981690 |
| Ω (om, deg) |
347.643999 |
| ω (w, deg) |
81.673493 |
| M (ma, deg) |
0.000099 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.710 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.710 |
| n |
2.000 |
| gf |
0.991 |
| gb |
-0.998 |
| 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 |
09:35:03.89 |
-15:43:34.9 |
HIP 46946 |
14.60 |
| 2026-02-03 12:00 |
09:35:00.51 |
-15:43:27.6 |
HIP 46946 |
13.77 |
| 2026-02-04 00:00 |
09:34:57.13 |
-15:43:20.0 |
HIP 46946 |
12.95 |
| 2026-02-04 12:00 |
09:34:53.75 |
-15:43:12.3 |
HIP 46946 |
12.13 |
| 2026-02-05 00:00 |
09:34:50.36 |
-15:43:04.3 |
HIP 46946 |
11.30 |
| 2026-02-05 12:00 |
09:34:46.97 |
-15:42:56.1 |
HIP 46946 |
10.47 |
| 2026-02-06 00:00 |
09:34:43.58 |
-15:42:47.6 |
HIP 46946 |
9.65 |
| 2026-02-06 12:00 |
09:34:40.19 |
-15:42:39.0 |
HIP 46946 |
8.82 |
| 2026-02-07 00:00 |
09:34:36.79 |
-15:42:30.1 |
HIP 46946 |
7.99 |
| 2026-02-07 12:00 |
09:34:33.39 |
-15:42:21.0 |
HIP 46946 |
7.15 |
| 2026-02-08 00:00 |
09:34:29.99 |
-15:42:11.7 |
HIP 46946 |
6.32 |
| 2026-02-08 12:00 |
09:34:26.59 |
-15:42:02.1 |
HIP 46946 |
5.49 |
| 2026-02-09 00:00 |
09:34:23.19 |
-15:41:52.4 |
HIP 46946 |
4.65 |
| 2026-02-09 12:00 |
09:34:19.79 |
-15:41:42.4 |
HIP 46946 |
3.82 |
| 2026-02-10 00:00 |
09:34:16.39 |
-15:41:32.2 |
HIP 46946 |
2.98 |
| 2026-02-10 12:00 |
09:34:12.99 |
-15:41:21.8 |
HIP 46946 |
2.15 |
| 2026-02-11 00:00 |
09:34:09.59 |
-15:41:11.2 |
HIP 46946 |
1.31 |
| 2026-02-11 12:00 |
09:34:06.19 |
-15:41:00.4 |
HIP 46946 |
0.49 |
| 2026-02-12 00:00 |
09:34:02.78 |
-15:40:49.4 |
HIP 46946 |
0.40 |
| 2026-02-12 12:00 |
09:33:59.38 |
-15:40:38.1 |
HIP 46946 |
1.22 |
| 2026-02-13 00:00 |
09:33:55.99 |
-15:40:26.7 |
HIP 46946 |
2.06 |
| 2026-02-13 12:00 |
09:33:52.59 |
-15:40:15.0 |
HIP 46946 |
2.90 |
| 2026-02-14 00:00 |
09:33:49.19 |
-15:40:03.1 |
HIP 46946 |
3.74 |
| 2026-02-14 12:00 |
09:33:45.80 |
-15:39:51.0 |
HIP 46946 |
4.58 |
| 2026-02-15 00:00 |
09:33:42.41 |
-15:39:38.8 |
HIP 46946 |
5.42 |
| 2026-02-15 12:00 |
09:33:39.02 |
-15:39:26.3 |
HIP 46946 |
6.26 |
| 2026-02-16 00:00 |
09:33:35.64 |
-15:39:13.6 |
HIP 46946 |
7.10 |
| 2026-02-16 12:00 |
09:33:32.25 |
-15:39:00.7 |
HIP 46946 |
7.95 |
| 2026-02-17 00:00 |
09:33:28.87 |
-15:38:47.6 |
HIP 46946 |
8.79 |
| 2026-02-17 12:00 |
09:33:25.50 |
-15:38:34.3 |
HIP 46946 |
9.63 |
| 2026-02-18 00:00 |
09:33:22.13 |
-15:38:20.9 |
HIP 46946 |
10.47 |
| 2026-02-18 12:00 |
09:33:18.76 |
-15:38:07.2 |
HIP 46946 |
11.32 |
| 2026-02-19 00:00 |
09:33:15.40 |
-15:37:53.3 |
HIP 46946 |
12.16 |
| 2026-02-19 12:00 |
09:33:12.04 |
-15:37:39.3 |
HIP 46946 |
13.00 |
| 2026-02-20 00:00 |
09:33:08.69 |
-15:37:25.0 |
HIP 46946 |
13.84 |
| 2026-02-20 12:00 |
09:33:05.34 |
-15:37:10.6 |
HIP 46946 |
14.68 |
| 2026-02-21 00:00 |
09:33:02.00 |
-15:36:56.0 |
HIP 46946 |
15.52 |
| 2026-02-21 12:00 |
09:32:58.66 |
-15:36:41.1 |
HIP 46946 |
16.36 |
| 2026-02-22 00:00 |
09:32:55.33 |
-15:36:26.2 |
HIP 46946 |
17.20 |
| 2026-02-22 12:00 |
09:32:52.01 |
-15:36:11.0 |
HIP 46946 |
18.04 |
| 2026-02-23 00:00 |
09:32:48.69 |
-15:35:55.6 |
HIP 46946 |
18.88 |
| 2026-02-23 12:00 |
09:32:45.38 |
-15:35:40.1 |
HIP 46946 |
19.72 |
| 2026-02-24 00:00 |
09:32:42.08 |
-15:35:24.4 |
HIP 46946 |
20.55 |