| 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) |
| 2026-06-01 00:00 |
01:53:50.24 |
+00:41:10.5 |
HIP 8815 |
20.41 |
| 2026-06-01 12:00 |
01:53:52.09 |
+00:41:17.6 |
HIP 8815 |
20.70 |
| 2026-06-02 00:00 |
01:53:53.93 |
+00:41:24.5 |
HIP 8815 |
21.00 |
| 2026-06-02 12:00 |
01:53:55.75 |
+00:41:31.4 |
HIP 8952 |
21.25 |
| 2026-06-03 00:00 |
01:53:57.56 |
+00:41:38.1 |
HIP 8952 |
20.84 |
| 2026-06-03 12:00 |
01:53:59.36 |
+00:41:44.7 |
HIP 8952 |
20.44 |
| 2026-06-04 00:00 |
01:54:01.14 |
+00:41:51.2 |
HIP 8952 |
20.03 |
| 2026-06-04 12:00 |
01:54:02.91 |
+00:41:57.5 |
HIP 8952 |
19.64 |
| 2026-06-05 00:00 |
01:54:04.67 |
+00:42:03.7 |
HIP 8952 |
19.24 |
| 2026-06-05 12:00 |
01:54:06.41 |
+00:42:09.8 |
HIP 8952 |
18.86 |
| 2026-06-06 00:00 |
01:54:08.13 |
+00:42:15.8 |
HIP 8952 |
18.48 |
| 2026-06-06 12:00 |
01:54:09.85 |
+00:42:21.7 |
HIP 8952 |
18.10 |
| 2026-06-07 00:00 |
01:54:11.55 |
+00:42:27.4 |
HIP 8952 |
17.73 |
| 2026-06-07 12:00 |
01:54:13.23 |
+00:42:33.0 |
HIP 8952 |
17.37 |
| 2026-06-08 00:00 |
01:54:14.90 |
+00:42:38.5 |
HIP 8952 |
17.01 |
| 2026-06-08 12:00 |
01:54:16.56 |
+00:42:43.8 |
HIP 8952 |
16.66 |
| 2026-06-09 00:00 |
01:54:18.20 |
+00:42:49.1 |
HIP 8952 |
16.31 |
| 2026-06-09 12:00 |
01:54:19.82 |
+00:42:54.2 |
HIP 8952 |
15.97 |
| 2026-06-10 00:00 |
01:54:21.44 |
+00:42:59.1 |
HIP 8952 |
15.64 |
| 2026-06-10 12:00 |
01:54:23.03 |
+00:43:04.0 |
HIP 8952 |
15.31 |
| 2026-06-11 00:00 |
01:54:24.61 |
+00:43:08.7 |
HIP 8952 |
14.99 |
| 2026-06-11 12:00 |
01:54:26.18 |
+00:43:13.3 |
HIP 8952 |
14.67 |
| 2026-06-12 00:00 |
01:54:27.73 |
+00:43:17.8 |
HIP 8952 |
14.36 |
| 2026-06-12 12:00 |
01:54:29.26 |
+00:43:22.1 |
HIP 8952 |
14.06 |
| 2026-06-13 00:00 |
01:54:30.78 |
+00:43:26.3 |
HIP 8952 |
13.76 |
| 2026-06-13 12:00 |
01:54:32.28 |
+00:43:30.4 |
HIP 8952 |
13.48 |
| 2026-06-14 00:00 |
01:54:33.77 |
+00:43:34.4 |
HIP 8952 |
13.20 |
| 2026-06-14 12:00 |
01:54:35.24 |
+00:43:38.2 |
HIP 8952 |
12.92 |
| 2026-06-15 00:00 |
01:54:36.69 |
+00:43:41.9 |
HIP 8952 |
12.65 |
| 2026-06-15 12:00 |
01:54:38.13 |
+00:43:45.4 |
HIP 8952 |
12.39 |
| 2026-06-16 00:00 |
01:54:39.55 |
+00:43:48.9 |
HIP 8952 |
12.14 |
| 2026-06-16 12:00 |
01:54:40.95 |
+00:43:52.1 |
HIP 8952 |
11.90 |
| 2026-06-17 00:00 |
01:54:42.34 |
+00:43:55.3 |
HIP 8952 |
11.66 |
| 2026-06-17 12:00 |
01:54:43.71 |
+00:43:58.4 |
HIP 8952 |
11.43 |
| 2026-06-18 00:00 |
01:54:45.06 |
+00:44:01.3 |
HIP 8952 |
11.21 |
| 2026-06-18 12:00 |
01:54:46.40 |
+00:44:04.0 |
HIP 8952 |
10.99 |
| 2026-06-19 00:00 |
01:54:47.72 |
+00:44:06.7 |
HIP 8952 |
10.79 |
| 2026-06-19 12:00 |
01:54:49.02 |
+00:44:09.2 |
HIP 8952 |
10.59 |
| 2026-06-20 00:00 |
01:54:50.31 |
+00:44:11.6 |
HIP 8952 |
10.40 |
| 2026-06-20 12:00 |
01:54:51.57 |
+00:44:13.8 |
HIP 8952 |
10.21 |
| 2026-06-21 00:00 |
01:54:52.82 |
+00:44:16.0 |
HIP 8952 |
10.04 |
| 2026-06-21 12:00 |
01:54:54.06 |
+00:44:17.9 |
HIP 8952 |
9.87 |
| 2026-06-22 00:00 |
01:54:55.27 |
+00:44:19.8 |
HIP 8952 |
9.71 |