| Parameter |
Value |
| Designation |
C/2003 G2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-04-29T22:13:50.937600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:28Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-15.0000000 |
| e |
0.99641357 |
| q (au) |
1.553361 |
| a (au) |
433.122485 |
| i (deg) |
96.166608 |
| Ω (om, deg) |
24.567711 |
| ω (w, deg) |
190.673723 |
| M (ma, deg) |
359.998368 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.220 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.220 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.598 |
| k |
0.967 |
| δ90 |
8.043 |
| 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) |
| 2026-09-20 00:00 |
01:53:11.54 |
+00:19:29.6 |
HIP 8815 |
3.36 |
| 2026-09-20 12:00 |
01:53:09.33 |
+00:19:14.9 |
HIP 8815 |
3.87 |
| 2026-09-21 00:00 |
01:53:07.10 |
+00:19:00.1 |
HIP 8815 |
4.40 |
| 2026-09-21 12:00 |
01:53:04.87 |
+00:18:45.4 |
HIP 8815 |
4.95 |
| 2026-09-22 00:00 |
01:53:02.62 |
+00:18:30.7 |
HIP 8815 |
5.52 |
| 2026-09-22 12:00 |
01:53:00.36 |
+00:18:16.0 |
HIP 8815 |
6.10 |
| 2026-09-23 00:00 |
01:52:58.09 |
+00:18:01.2 |
HIP 8815 |
6.69 |
| 2026-09-23 12:00 |
01:52:55.81 |
+00:17:46.5 |
HIP 8815 |
7.28 |
| 2026-09-24 00:00 |
01:52:53.52 |
+00:17:31.8 |
HIP 8815 |
7.88 |
| 2026-09-24 12:00 |
01:52:51.21 |
+00:17:17.0 |
HIP 8815 |
8.49 |
| 2026-09-25 00:00 |
01:52:48.90 |
+00:17:02.3 |
HIP 8815 |
9.10 |
| 2026-09-25 12:00 |
01:52:46.57 |
+00:16:47.5 |
HIP 8815 |
9.71 |
| 2026-09-26 00:00 |
01:52:44.23 |
+00:16:32.8 |
HIP 8815 |
10.33 |
| 2026-09-26 12:00 |
01:52:41.89 |
+00:16:18.1 |
HIP 8815 |
10.96 |
| 2026-09-27 00:00 |
01:52:39.53 |
+00:16:03.3 |
HIP 8815 |
11.58 |
| 2026-09-27 12:00 |
01:52:37.17 |
+00:15:48.6 |
HIP 8815 |
12.21 |
| 2026-09-28 00:00 |
01:52:34.79 |
+00:15:33.9 |
HIP 8815 |
12.85 |
| 2026-09-28 12:00 |
01:52:32.40 |
+00:15:19.2 |
HIP 8815 |
13.48 |
| 2026-09-29 00:00 |
01:52:30.01 |
+00:15:04.5 |
HIP 8815 |
14.12 |
| 2026-09-29 12:00 |
01:52:27.60 |
+00:14:49.8 |
HIP 8815 |
14.76 |
| 2026-09-30 00:00 |
01:52:25.19 |
+00:14:35.1 |
HIP 8815 |
15.41 |
| 2026-09-30 12:00 |
01:52:22.77 |
+00:14:20.5 |
HIP 8815 |
16.05 |
| 2026-10-01 00:00 |
01:52:20.34 |
+00:14:05.8 |
HIP 8815 |
16.70 |
| 2026-10-01 12:00 |
01:52:17.90 |
+00:13:51.2 |
HIP 8815 |
17.35 |
| 2026-10-02 00:00 |
01:52:15.45 |
+00:13:36.6 |
HIP 8815 |
18.01 |
| 2026-10-02 12:00 |
01:52:12.99 |
+00:13:22.0 |
HIP 8815 |
18.66 |
| 2026-10-03 00:00 |
01:52:10.52 |
+00:13:07.4 |
HIP 8815 |
19.32 |
| 2026-10-03 12:00 |
01:52:08.05 |
+00:12:52.8 |
HIP 8815 |
19.98 |
| 2026-10-04 00:00 |
01:52:05.57 |
+00:12:38.3 |
HIP 8815 |
20.64 |
| 2026-10-04 12:00 |
01:52:03.08 |
+00:12:23.8 |
HIP 8815 |
21.30 |
| 2026-10-05 00:00 |
01:52:00.58 |
+00:12:09.3 |
HIP 8815 |
21.97 |
| 2026-10-05 12:00 |
01:51:58.08 |
+00:11:54.8 |
HIP 8815 |
22.63 |
| 2026-10-06 00:00 |
01:51:55.57 |
+00:11:40.4 |
HIP 8815 |
23.30 |
| 2026-10-06 12:00 |
01:51:53.05 |
+00:11:26.0 |
HIP 8815 |
23.97 |
| 2026-10-07 00:00 |
01:51:50.53 |
+00:11:11.6 |
HIP 8815 |
24.64 |
| 2026-10-07 12:00 |
01:51:48.00 |
+00:10:57.2 |
HIP 8815 |
25.31 |
| 2026-10-08 00:00 |
01:51:45.46 |
+00:10:42.9 |
HIP 8815 |
25.99 |
| 2026-10-08 12:00 |
01:51:42.92 |
+00:10:28.6 |
HIP 8815 |
26.66 |
| 2026-10-09 00:00 |
01:51:40.37 |
+00:10:14.4 |
HIP 8815 |
27.34 |
| 2026-10-09 12:00 |
01:51:37.82 |
+00:10:00.2 |
HIP 8815 |
28.01 |
| 2026-10-10 00:00 |
01:51:35.26 |
+00:09:46.0 |
HIP 8815 |
28.69 |
| 2026-10-10 12:00 |
01:51:32.69 |
+00:09:31.9 |
HIP 8596 |
28.34 |
| 2026-10-11 00:00 |
01:51:30.12 |
+00:09:17.8 |
HIP 8596 |
27.91 |