| 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 |
0.999 |
| gb |
-0.503 |
| 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) |
| 2026-07-29 00:00 |
09:31:21.91 |
-14:23:19.7 |
HIP 46772 |
23.97 |
| 2026-07-29 12:00 |
09:31:24.46 |
-14:23:28.9 |
HIP 46772 |
23.61 |
| 2026-07-30 00:00 |
09:31:27.02 |
-14:23:38.3 |
HIP 46772 |
23.27 |
| 2026-07-30 12:00 |
09:31:29.58 |
-14:23:47.9 |
HIP 46772 |
22.93 |
| 2026-07-31 00:00 |
09:31:32.15 |
-14:23:57.7 |
HIP 46772 |
22.60 |
| 2026-07-31 12:00 |
09:31:34.72 |
-14:24:07.7 |
HIP 46772 |
22.28 |
| 2026-08-01 00:00 |
09:31:37.30 |
-14:24:17.8 |
HIP 46772 |
21.97 |
| 2026-08-01 12:00 |
09:31:39.88 |
-14:24:28.2 |
HIP 46772 |
21.67 |
| 2026-08-02 00:00 |
09:31:42.46 |
-14:24:38.8 |
HIP 46772 |
21.39 |
| 2026-08-02 12:00 |
09:31:45.05 |
-14:24:49.5 |
HIP 46772 |
21.12 |
| 2026-08-03 00:00 |
09:31:47.65 |
-14:25:00.5 |
HIP 46772 |
20.86 |
| 2026-08-03 12:00 |
09:31:50.25 |
-14:25:11.6 |
HIP 46772 |
20.62 |
| 2026-08-04 00:00 |
09:31:52.85 |
-14:25:22.9 |
HIP 46772 |
20.39 |
| 2026-08-04 12:00 |
09:31:55.45 |
-14:25:34.5 |
HIP 46772 |
20.18 |
| 2026-08-05 00:00 |
09:31:58.06 |
-14:25:46.2 |
HIP 46772 |
19.98 |
| 2026-08-05 12:00 |
09:32:00.68 |
-14:25:58.1 |
HIP 46772 |
19.80 |
| 2026-08-06 00:00 |
09:32:03.29 |
-14:26:10.2 |
HIP 46772 |
19.64 |
| 2026-08-06 12:00 |
09:32:05.91 |
-14:26:22.5 |
HIP 46772 |
19.49 |
| 2026-08-07 00:00 |
09:32:08.53 |
-14:26:34.9 |
HIP 46772 |
19.37 |
| 2026-08-07 12:00 |
09:32:11.15 |
-14:26:47.6 |
HIP 46772 |
19.26 |
| 2026-08-08 00:00 |
09:32:13.78 |
-14:27:00.4 |
HIP 46772 |
19.18 |
| 2026-08-08 12:00 |
09:32:16.41 |
-14:27:13.5 |
HIP 46772 |
19.11 |
| 2026-08-09 00:00 |
09:32:19.04 |
-14:27:26.7 |
HIP 46772 |
19.06 |
| 2026-08-09 12:00 |
09:32:21.67 |
-14:27:40.1 |
HIP 46772 |
19.04 |
| 2026-08-10 00:00 |
09:32:24.30 |
-14:27:53.7 |
HIP 46772 |
19.04 |
| 2026-08-10 12:00 |
09:32:26.93 |
-14:28:07.5 |
HIP 46772 |
19.06 |
| 2026-08-11 00:00 |
09:32:29.57 |
-14:28:21.4 |
HIP 46772 |
19.09 |
| 2026-08-11 12:00 |
09:32:32.20 |
-14:28:35.6 |
HIP 46772 |
19.16 |
| 2026-08-12 00:00 |
09:32:34.84 |
-14:28:49.9 |
HIP 46772 |
19.24 |
| 2026-08-12 12:00 |
09:32:37.48 |
-14:29:04.4 |
HIP 46772 |
19.34 |
| 2026-08-13 00:00 |
09:32:40.11 |
-14:29:19.1 |
HIP 46772 |
19.46 |
| 2026-08-13 12:00 |
09:32:42.75 |
-14:29:34.0 |
HIP 46772 |
19.61 |
| 2026-08-14 00:00 |
09:32:45.39 |
-14:29:49.0 |
HIP 46772 |
19.77 |
| 2026-08-14 12:00 |
09:32:48.03 |
-14:30:04.2 |
HIP 46772 |
19.96 |
| 2026-08-15 00:00 |
09:32:50.66 |
-14:30:19.6 |
HIP 46772 |
20.16 |
| 2026-08-15 12:00 |
09:32:53.30 |
-14:30:35.2 |
HIP 46772 |
20.38 |
| 2026-08-16 00:00 |
09:32:55.93 |
-14:30:51.0 |
HIP 46772 |
20.62 |
| 2026-08-16 12:00 |
09:32:58.57 |
-14:31:06.9 |
HIP 46772 |
20.88 |
| 2026-08-17 00:00 |
09:33:01.20 |
-14:31:23.0 |
HIP 46772 |
21.16 |
| 2026-08-17 12:00 |
09:33:03.83 |
-14:31:39.3 |
HIP 46772 |
21.45 |
| 2026-08-18 00:00 |
09:33:06.46 |
-14:31:55.7 |
HIP 46772 |
21.76 |
| 2026-08-18 12:00 |
09:33:09.08 |
-14:32:12.3 |
HIP 46772 |
22.08 |
| 2026-08-19 00:00 |
09:33:11.71 |
-14:32:29.1 |
HIP 46772 |
22.42 |