| Parameter |
Value |
| Designation |
C/2004 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-06-04T22:25:55.669440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:40Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
23.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-04-16.0000000 |
| e |
0.99627354 |
| q (au) |
1.201031 |
| a (au) |
322.298040 |
| i (deg) |
114.486194 |
| Ω (om, deg) |
228.344676 |
| ω (w, deg) |
110.604107 |
| M (ma, deg) |
359.991494 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.162 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.162 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2004-04-09 |
2004-05-15 |
+33.2977 |
-5.480 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:24:07.87 |
-72:47:14.3 |
HIP 6256 |
17.45 |
| 2026-07-29 12:00 |
01:24:05.68 |
-72:47:56.1 |
HIP 6256 |
17.38 |
| 2026-07-30 00:00 |
01:24:03.40 |
-72:48:37.9 |
HIP 6256 |
17.35 |
| 2026-07-30 12:00 |
01:24:01.06 |
-72:49:19.6 |
HIP 6256 |
17.33 |
| 2026-07-31 00:00 |
01:23:58.64 |
-72:50:01.2 |
HIP 6328 |
16.93 |
| 2026-07-31 12:00 |
01:23:56.15 |
-72:50:42.7 |
HIP 6328 |
16.31 |
| 2026-08-01 00:00 |
01:23:53.58 |
-72:51:24.2 |
HIP 6328 |
15.70 |
| 2026-08-01 12:00 |
01:23:50.94 |
-72:52:05.6 |
HIP 6328 |
15.09 |
| 2026-08-02 00:00 |
01:23:48.22 |
-72:52:46.9 |
HIP 6328 |
14.49 |
| 2026-08-02 12:00 |
01:23:45.43 |
-72:53:28.1 |
HIP 6328 |
13.90 |
| 2026-08-03 00:00 |
01:23:42.57 |
-72:54:09.2 |
HIP 6328 |
13.32 |
| 2026-08-03 12:00 |
01:23:39.63 |
-72:54:50.3 |
HIP 6328 |
12.74 |
| 2026-08-04 00:00 |
01:23:36.62 |
-72:55:31.2 |
HIP 6328 |
12.18 |
| 2026-08-04 12:00 |
01:23:33.54 |
-72:56:12.1 |
HIP 6328 |
11.63 |
| 2026-08-05 00:00 |
01:23:30.38 |
-72:56:52.8 |
HIP 6328 |
11.10 |
| 2026-08-05 12:00 |
01:23:27.14 |
-72:57:33.5 |
HIP 6328 |
10.58 |
| 2026-08-06 00:00 |
01:23:23.84 |
-72:58:14.0 |
HIP 6328 |
10.09 |
| 2026-08-06 12:00 |
01:23:20.46 |
-72:58:54.4 |
HIP 6328 |
9.62 |
| 2026-08-07 00:00 |
01:23:17.00 |
-72:59:34.7 |
HIP 6328 |
9.18 |
| 2026-08-07 12:00 |
01:23:13.48 |
-73:00:14.9 |
HIP 6328 |
8.77 |
| 2026-08-08 00:00 |
01:23:09.87 |
-73:00:55.0 |
HIP 6328 |
8.39 |
| 2026-08-08 12:00 |
01:23:06.20 |
-73:01:35.0 |
HIP 6328 |
8.06 |
| 2026-08-09 00:00 |
01:23:02.45 |
-73:02:14.8 |
HIP 6328 |
7.78 |
| 2026-08-09 12:00 |
01:22:58.63 |
-73:02:54.5 |
HIP 6328 |
7.54 |
| 2026-08-10 00:00 |
01:22:54.74 |
-73:03:34.1 |
HIP 6328 |
7.37 |
| 2026-08-10 12:00 |
01:22:50.77 |
-73:04:13.5 |
HIP 6328 |
7.26 |
| 2026-08-11 00:00 |
01:22:46.73 |
-73:04:52.8 |
HIP 6328 |
7.21 |
| 2026-08-11 12:00 |
01:22:42.61 |
-73:05:31.9 |
HIP 6328 |
7.22 |
| 2026-08-12 00:00 |
01:22:38.43 |
-73:06:10.9 |
HIP 6328 |
7.31 |
| 2026-08-12 12:00 |
01:22:34.17 |
-73:06:49.8 |
HIP 6328 |
7.45 |
| 2026-08-13 00:00 |
01:22:29.84 |
-73:07:28.5 |
HIP 6328 |
7.66 |
| 2026-08-13 12:00 |
01:22:25.44 |
-73:08:07.0 |
HIP 6328 |
7.92 |
| 2026-08-14 00:00 |
01:22:20.96 |
-73:08:45.4 |
HIP 6328 |
8.23 |
| 2026-08-14 12:00 |
01:22:16.42 |
-73:09:23.6 |
HIP 6328 |
8.58 |
| 2026-08-15 00:00 |
01:22:11.80 |
-73:10:01.7 |
HIP 6328 |
8.98 |
| 2026-08-15 12:00 |
01:22:07.11 |
-73:10:39.6 |
HIP 6328 |
9.40 |
| 2026-08-16 00:00 |
01:22:02.35 |
-73:11:17.3 |
HIP 6328 |
9.86 |
| 2026-08-16 12:00 |
01:21:57.53 |
-73:11:54.8 |
HIP 6328 |
10.34 |
| 2026-08-17 00:00 |
01:21:52.63 |
-73:12:32.2 |
HIP 6328 |
10.84 |
| 2026-08-17 12:00 |
01:21:47.66 |
-73:13:09.4 |
HIP 6328 |
11.37 |
| 2026-08-18 00:00 |
01:21:42.62 |
-73:13:46.4 |
HIP 6328 |
11.91 |
| 2026-08-18 12:00 |
01:21:37.51 |
-73:14:23.2 |
HIP 6328 |
12.46 |
| 2026-08-19 00:00 |
01:21:32.34 |
-73:14:59.8 |
HIP 6328 |
13.03 |