| 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) |
| 2026-06-01 00:00 |
02:53:50.13 |
+43:36:04.9 |
HIP 13450 |
15.31 |
| 2026-06-01 12:00 |
02:53:53.64 |
+43:36:20.0 |
HIP 13450 |
15.39 |
| 2026-06-02 00:00 |
02:53:57.13 |
+43:36:35.2 |
HIP 13450 |
15.49 |
| 2026-06-02 12:00 |
02:54:00.62 |
+43:36:50.4 |
HIP 13450 |
15.63 |
| 2026-06-03 00:00 |
02:54:04.09 |
+43:37:05.8 |
HIP 13450 |
15.78 |
| 2026-06-03 12:00 |
02:54:07.55 |
+43:37:21.3 |
HIP 13450 |
15.97 |
| 2026-06-04 00:00 |
02:54:11.00 |
+43:37:36.9 |
HIP 13450 |
16.17 |
| 2026-06-04 12:00 |
02:54:14.43 |
+43:37:52.5 |
HIP 13450 |
16.40 |
| 2026-06-05 00:00 |
02:54:17.85 |
+43:38:08.3 |
HIP 13450 |
16.65 |
| 2026-06-05 12:00 |
02:54:21.26 |
+43:38:24.2 |
HIP 13450 |
16.91 |
| 2026-06-06 00:00 |
02:54:24.65 |
+43:38:40.1 |
HIP 13450 |
17.20 |
| 2026-06-06 12:00 |
02:54:28.03 |
+43:38:56.1 |
HIP 13450 |
17.51 |
| 2026-06-07 00:00 |
02:54:31.40 |
+43:39:12.3 |
HIP 13450 |
17.83 |
| 2026-06-07 12:00 |
02:54:34.75 |
+43:39:28.5 |
HIP 13450 |
18.17 |
| 2026-06-08 00:00 |
02:54:38.08 |
+43:39:44.8 |
HIP 13450 |
18.52 |
| 2026-06-08 12:00 |
02:54:41.40 |
+43:40:01.1 |
HIP 13450 |
18.88 |
| 2026-06-09 00:00 |
02:54:44.71 |
+43:40:17.6 |
HIP 13450 |
19.26 |
| 2026-06-09 12:00 |
02:54:48.00 |
+43:40:34.2 |
HIP 13450 |
19.65 |
| 2026-06-10 00:00 |
02:54:51.27 |
+43:40:50.8 |
HIP 13450 |
20.05 |
| 2026-06-10 12:00 |
02:54:54.53 |
+43:41:07.5 |
HIP 13450 |
20.46 |
| 2026-06-11 00:00 |
02:54:57.77 |
+43:41:24.3 |
HIP 13450 |
20.88 |
| 2026-06-11 12:00 |
02:55:01.00 |
+43:41:41.2 |
HIP 13450 |
21.31 |
| 2026-06-12 00:00 |
02:55:04.21 |
+43:41:58.2 |
HIP 13450 |
21.74 |
| 2026-06-12 12:00 |
02:55:07.40 |
+43:42:15.2 |
HIP 13450 |
22.18 |
| 2026-06-13 00:00 |
02:55:10.58 |
+43:42:32.3 |
HIP 13450 |
22.63 |
| 2026-06-13 12:00 |
02:55:13.74 |
+43:42:49.5 |
HIP 13450 |
23.09 |
| 2026-06-14 00:00 |
02:55:16.88 |
+43:43:06.7 |
HIP 13450 |
23.54 |
| 2026-06-14 12:00 |
02:55:20.01 |
+43:43:24.0 |
HIP 13450 |
24.01 |
| 2026-06-15 00:00 |
02:55:23.11 |
+43:43:41.4 |
HIP 13450 |
24.47 |
| 2026-06-15 12:00 |
02:55:26.20 |
+43:43:58.9 |
HIP 13703 |
24.08 |
| 2026-06-16 00:00 |
02:55:29.27 |
+43:44:16.4 |
HIP 13703 |
23.58 |
| 2026-06-16 12:00 |
02:55:32.33 |
+43:44:34.0 |
HIP 13703 |
23.08 |
| 2026-06-17 00:00 |
02:55:35.36 |
+43:44:51.7 |
HIP 13703 |
22.58 |
| 2026-06-17 12:00 |
02:55:38.37 |
+43:45:09.4 |
HIP 13703 |
22.09 |
| 2026-06-18 00:00 |
02:55:41.37 |
+43:45:27.2 |
HIP 13703 |
21.61 |
| 2026-06-18 12:00 |
02:55:44.35 |
+43:45:45.0 |
HIP 13703 |
21.14 |
| 2026-06-19 00:00 |
02:55:47.30 |
+43:46:02.9 |
HIP 13703 |
20.67 |
| 2026-06-19 12:00 |
02:55:50.24 |
+43:46:20.9 |
HIP 13703 |
20.21 |
| 2026-06-20 00:00 |
02:55:53.16 |
+43:46:38.9 |
HIP 13703 |
19.76 |
| 2026-06-20 12:00 |
02:55:56.06 |
+43:46:57.0 |
HIP 13703 |
19.32 |
| 2026-06-21 00:00 |
02:55:58.94 |
+43:47:15.1 |
HIP 13703 |
18.89 |
| 2026-06-21 12:00 |
02:56:01.79 |
+43:47:33.3 |
HIP 13703 |
18.47 |
| 2026-06-22 00:00 |
02:56:04.63 |
+43:47:51.5 |
HIP 13703 |
18.06 |