C/2003 G2 (LINEAR)
| 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
$$
M_a = (16.219 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.219 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.598 |
| k |
0.967 |
| δ90 |
8.030 |
| 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 |
01:46:08.38 |
-00:16:14.2 |
HIP 8274 |
24.12 |
| 2026-02-03 12:00 |
01:46:09.01 |
-00:16:01.2 |
HIP 8274 |
23.87 |
| 2026-02-04 00:00 |
01:46:09.66 |
-00:15:48.1 |
HIP 8274 |
23.61 |
| 2026-02-04 12:00 |
01:46:10.33 |
-00:15:34.8 |
HIP 8274 |
23.35 |
| 2026-02-05 00:00 |
01:46:11.02 |
-00:15:21.5 |
HIP 8274 |
23.09 |
| 2026-02-05 12:00 |
01:46:11.73 |
-00:15:08.1 |
HIP 8274 |
22.82 |
| 2026-02-06 00:00 |
01:46:12.47 |
-00:14:54.6 |
HIP 8274 |
22.55 |
| 2026-02-06 12:00 |
01:46:13.22 |
-00:14:41.0 |
HIP 8274 |
22.28 |
| 2026-02-07 00:00 |
01:46:14.00 |
-00:14:27.3 |
HIP 8274 |
22.01 |
| 2026-02-07 12:00 |
01:46:14.79 |
-00:14:13.5 |
HIP 8274 |
21.74 |
| 2026-02-08 00:00 |
01:46:15.61 |
-00:13:59.6 |
HIP 8274 |
21.46 |
| 2026-02-08 12:00 |
01:46:16.45 |
-00:13:45.7 |
HIP 8274 |
21.18 |
| 2026-02-09 00:00 |
01:46:17.30 |
-00:13:31.6 |
HIP 8274 |
20.90 |
| 2026-02-09 12:00 |
01:46:18.18 |
-00:13:17.5 |
HIP 8274 |
20.62 |
| 2026-02-10 00:00 |
01:46:19.08 |
-00:13:03.3 |
HIP 8274 |
20.34 |
| 2026-02-10 12:00 |
01:46:20.00 |
-00:12:49.0 |
HIP 8274 |
20.05 |
| 2026-02-11 00:00 |
01:46:20.94 |
-00:12:34.6 |
HIP 8274 |
19.77 |
| 2026-02-11 12:00 |
01:46:21.90 |
-00:12:20.1 |
HIP 8274 |
19.48 |
| 2026-02-12 00:00 |
01:46:22.88 |
-00:12:05.6 |
HIP 8274 |
19.19 |
| 2026-02-12 12:00 |
01:46:23.88 |
-00:11:51.0 |
HIP 8274 |
18.91 |
| 2026-02-13 00:00 |
01:46:24.90 |
-00:11:36.3 |
HIP 8274 |
18.62 |
| 2026-02-13 12:00 |
01:46:25.94 |
-00:11:21.5 |
HIP 8274 |
18.33 |
| 2026-02-14 00:00 |
01:46:27.00 |
-00:11:06.6 |
HIP 8274 |
18.05 |
| 2026-02-14 12:00 |
01:46:28.08 |
-00:10:51.7 |
HIP 8274 |
17.76 |
| 2026-02-15 00:00 |
01:46:29.17 |
-00:10:36.7 |
HIP 8274 |
17.48 |
| 2026-02-15 12:00 |
01:46:30.29 |
-00:10:21.6 |
HIP 8274 |
17.19 |
| 2026-02-16 00:00 |
01:46:31.43 |
-00:10:06.4 |
HIP 8274 |
16.91 |
| 2026-02-16 12:00 |
01:46:32.59 |
-00:09:51.2 |
HIP 8274 |
16.64 |
| 2026-02-17 00:00 |
01:46:33.76 |
-00:09:35.9 |
HIP 8274 |
16.36 |
| 2026-02-17 12:00 |
01:46:34.96 |
-00:09:20.5 |
HIP 8274 |
16.09 |
| 2026-02-18 00:00 |
01:46:36.17 |
-00:09:05.1 |
HIP 8274 |
15.82 |
| 2026-02-18 12:00 |
01:46:37.40 |
-00:08:49.6 |
HIP 8274 |
15.56 |
| 2026-02-19 00:00 |
01:46:38.65 |
-00:08:34.0 |
HIP 8274 |
15.30 |
| 2026-02-19 12:00 |
01:46:39.92 |
-00:08:18.4 |
HIP 8274 |
15.04 |
| 2026-02-20 00:00 |
01:46:41.21 |
-00:08:02.7 |
HIP 8274 |
14.80 |
| 2026-02-20 12:00 |
01:46:42.52 |
-00:07:46.9 |
HIP 8274 |
14.56 |
| 2026-02-21 00:00 |
01:46:43.84 |
-00:07:31.1 |
HIP 8274 |
14.33 |
| 2026-02-21 12:00 |
01:46:45.18 |
-00:07:15.3 |
HIP 8274 |
14.10 |
| 2026-02-22 00:00 |
01:46:46.54 |
-00:06:59.3 |
HIP 8274 |
13.89 |
| 2026-02-22 12:00 |
01:46:47.92 |
-00:06:43.3 |
HIP 8274 |
13.68 |
| 2026-02-23 00:00 |
01:46:49.32 |
-00:06:27.3 |
HIP 8274 |
13.49 |
| 2026-02-23 12:00 |
01:46:50.73 |
-00:06:11.2 |
HIP 8274 |
13.31 |
| 2026-02-24 00:00 |
01:46:52.16 |
-00:05:55.0 |
HIP 8274 |
13.14 |