C/2003 G1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2003 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-02-03T15:42:49.510080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:27Z |
| Obs used |
1472 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-08-25.0000000 |
| e |
1.00137916 |
| q (au) |
4.916288 |
| a (au) |
-3564.686955 |
| i (deg) |
66.849308 |
| Ω (om, deg) |
246.088785 |
| ω (w, deg) |
11.422485 |
| M (ma, deg) |
0.000937 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.546 + 5.811\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.546 |
| n |
5.811 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
02:42:39.13 |
+43:49:13.2 |
HIP 12725 |
19.75 |
| 2026-02-03 12:00 |
02:42:39.40 |
+43:48:50.5 |
HIP 12725 |
19.40 |
| 2026-02-04 00:00 |
02:42:39.71 |
+43:48:27.9 |
HIP 12725 |
19.05 |
| 2026-02-04 12:00 |
02:42:40.04 |
+43:48:05.5 |
HIP 12725 |
18.70 |
| 2026-02-05 00:00 |
02:42:40.41 |
+43:47:43.1 |
HIP 12725 |
18.35 |
| 2026-02-05 12:00 |
02:42:40.82 |
+43:47:20.9 |
HIP 12725 |
18.00 |
| 2026-02-06 00:00 |
02:42:41.25 |
+43:46:58.8 |
HIP 12725 |
17.65 |
| 2026-02-06 12:00 |
02:42:41.72 |
+43:46:36.8 |
HIP 12725 |
17.30 |
| 2026-02-07 00:00 |
02:42:42.22 |
+43:46:14.9 |
HIP 12725 |
16.95 |
| 2026-02-07 12:00 |
02:42:42.76 |
+43:45:53.2 |
HIP 12725 |
16.60 |
| 2026-02-08 00:00 |
02:42:43.33 |
+43:45:31.6 |
HIP 12725 |
16.24 |
| 2026-02-08 12:00 |
02:42:43.93 |
+43:45:10.1 |
HIP 12725 |
15.89 |
| 2026-02-09 00:00 |
02:42:44.56 |
+43:44:48.8 |
HIP 12725 |
15.53 |
| 2026-02-09 12:00 |
02:42:45.23 |
+43:44:27.5 |
HIP 12725 |
15.18 |
| 2026-02-10 00:00 |
02:42:45.93 |
+43:44:06.4 |
HIP 12725 |
14.82 |
| 2026-02-10 12:00 |
02:42:46.66 |
+43:43:45.5 |
HIP 12725 |
14.46 |
| 2026-02-11 00:00 |
02:42:47.43 |
+43:43:24.7 |
HIP 12725 |
14.10 |
| 2026-02-11 12:00 |
02:42:48.23 |
+43:43:04.0 |
HIP 12725 |
13.74 |
| 2026-02-12 00:00 |
02:42:49.06 |
+43:42:43.4 |
HIP 12725 |
13.38 |
| 2026-02-12 12:00 |
02:42:49.92 |
+43:42:23.0 |
HIP 12725 |
13.02 |
| 2026-02-13 00:00 |
02:42:50.81 |
+43:42:02.7 |
HIP 12725 |
12.66 |
| 2026-02-13 12:00 |
02:42:51.74 |
+43:41:42.6 |
HIP 12725 |
12.29 |
| 2026-02-14 00:00 |
02:42:52.70 |
+43:41:22.6 |
HIP 12725 |
11.93 |
| 2026-02-14 12:00 |
02:42:53.69 |
+43:41:02.8 |
HIP 12725 |
11.56 |
| 2026-02-15 00:00 |
02:42:54.72 |
+43:40:43.1 |
HIP 12725 |
11.19 |
| 2026-02-15 12:00 |
02:42:55.77 |
+43:40:23.5 |
HIP 12725 |
10.82 |
| 2026-02-16 00:00 |
02:42:56.86 |
+43:40:04.1 |
HIP 12725 |
10.45 |
| 2026-02-16 12:00 |
02:42:57.98 |
+43:39:44.9 |
HIP 12725 |
10.07 |
| 2026-02-17 00:00 |
02:42:59.13 |
+43:39:25.7 |
HIP 12725 |
9.70 |
| 2026-02-17 12:00 |
02:43:00.31 |
+43:39:06.8 |
HIP 12725 |
9.32 |
| 2026-02-18 00:00 |
02:43:01.53 |
+43:38:48.0 |
HIP 12725 |
8.94 |
| 2026-02-18 12:00 |
02:43:02.77 |
+43:38:29.3 |
HIP 12725 |
8.56 |
| 2026-02-19 00:00 |
02:43:04.05 |
+43:38:10.8 |
HIP 12725 |
8.18 |
| 2026-02-19 12:00 |
02:43:05.36 |
+43:37:52.5 |
HIP 12725 |
7.79 |
| 2026-02-20 00:00 |
02:43:06.69 |
+43:37:34.3 |
HIP 12725 |
7.41 |
| 2026-02-20 12:00 |
02:43:08.06 |
+43:37:16.3 |
HIP 12725 |
7.02 |
| 2026-02-21 00:00 |
02:43:09.46 |
+43:36:58.4 |
HIP 12725 |
6.63 |
| 2026-02-21 12:00 |
02:43:10.89 |
+43:36:40.7 |
HIP 12725 |
6.24 |
| 2026-02-22 00:00 |
02:43:12.36 |
+43:36:23.2 |
HIP 12725 |
5.84 |
| 2026-02-22 12:00 |
02:43:13.85 |
+43:36:05.8 |
HIP 12725 |
5.45 |
| 2026-02-23 00:00 |
02:43:15.37 |
+43:35:48.6 |
HIP 12725 |
5.05 |
| 2026-02-23 12:00 |
02:43:16.92 |
+43:35:31.5 |
HIP 12725 |
4.65 |
| 2026-02-24 00:00 |
02:43:18.50 |
+43:35:14.6 |
HIP 12725 |
4.25 |