| 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) |
| 2026-03-26 00:00 |
01:04:39.47 |
-71:08:55.0 |
HIP 5107 |
13.48 |
| 2026-03-26 12:00 |
01:04:47.13 |
-71:08:43.9 |
HIP 5107 |
13.14 |
| 2026-03-27 00:00 |
01:04:54.80 |
-71:08:33.2 |
HIP 5107 |
12.83 |
| 2026-03-27 12:00 |
01:05:02.48 |
-71:08:22.7 |
HIP 5107 |
12.54 |
| 2026-03-28 00:00 |
01:05:10.17 |
-71:08:12.6 |
HIP 5107 |
12.29 |
| 2026-03-28 12:00 |
01:05:17.87 |
-71:08:02.8 |
HIP 5107 |
12.07 |
| 2026-03-29 00:00 |
01:05:25.58 |
-71:07:53.3 |
HIP 5107 |
11.89 |
| 2026-03-29 12:00 |
01:05:33.30 |
-71:07:44.2 |
HIP 5107 |
11.75 |
| 2026-03-30 00:00 |
01:05:41.03 |
-71:07:35.4 |
HIP 5107 |
11.65 |
| 2026-03-30 12:00 |
01:05:48.77 |
-71:07:26.8 |
HIP 5107 |
11.58 |
| 2026-03-31 00:00 |
01:05:56.51 |
-71:07:18.7 |
HIP 5107 |
11.56 |
| 2026-03-31 12:00 |
01:06:04.27 |
-71:07:10.8 |
HIP 5107 |
11.58 |
| 2026-04-01 00:00 |
01:06:12.03 |
-71:07:03.3 |
HIP 5107 |
11.64 |
| 2026-04-01 12:00 |
01:06:19.80 |
-71:06:56.1 |
HIP 5107 |
11.75 |
| 2026-04-02 00:00 |
01:06:27.58 |
-71:06:49.2 |
HIP 5107 |
11.89 |
| 2026-04-02 12:00 |
01:06:35.36 |
-71:06:42.6 |
HIP 5107 |
12.07 |
| 2026-04-03 00:00 |
01:06:43.15 |
-71:06:36.4 |
HIP 5107 |
12.28 |
| 2026-04-03 12:00 |
01:06:50.94 |
-71:06:30.5 |
HIP 5107 |
12.53 |
| 2026-04-04 00:00 |
01:06:58.74 |
-71:06:24.9 |
HIP 5107 |
12.81 |
| 2026-04-04 12:00 |
01:07:06.54 |
-71:06:19.7 |
HIP 5107 |
13.12 |
| 2026-04-05 00:00 |
01:07:14.35 |
-71:06:14.8 |
HIP 5107 |
13.46 |
| 2026-04-05 12:00 |
01:07:22.16 |
-71:06:10.2 |
HIP 5107 |
13.82 |
| 2026-04-06 00:00 |
01:07:29.97 |
-71:06:05.9 |
HIP 5107 |
14.21 |
| 2026-04-06 12:00 |
01:07:37.79 |
-71:06:02.0 |
HIP 5107 |
14.62 |
| 2026-04-07 00:00 |
01:07:45.61 |
-71:05:58.4 |
HIP 5107 |
15.05 |
| 2026-04-07 12:00 |
01:07:53.43 |
-71:05:55.1 |
HIP 5107 |
15.49 |
| 2026-04-08 00:00 |
01:08:01.25 |
-71:05:52.1 |
HIP 5107 |
15.96 |
| 2026-04-08 12:00 |
01:08:09.08 |
-71:05:49.5 |
HIP 5107 |
16.44 |
| 2026-04-09 00:00 |
01:08:16.90 |
-71:05:47.2 |
HIP 5107 |
16.93 |
| 2026-04-09 12:00 |
01:08:24.72 |
-71:05:45.3 |
HIP 5107 |
17.43 |
| 2026-04-10 00:00 |
01:08:32.55 |
-71:05:43.7 |
HIP 5107 |
17.95 |
| 2026-04-10 12:00 |
01:08:40.37 |
-71:05:42.4 |
HIP 5107 |
18.48 |
| 2026-04-11 00:00 |
01:08:48.19 |
-71:05:41.4 |
HIP 5107 |
19.01 |
| 2026-04-11 12:00 |
01:08:56.01 |
-71:05:40.8 |
HIP 5107 |
19.56 |
| 2026-04-12 00:00 |
01:09:03.83 |
-71:05:40.5 |
HIP 5107 |
20.11 |
| 2026-04-12 12:00 |
01:09:11.64 |
-71:05:40.6 |
HIP 5107 |
20.67 |
| 2026-04-13 00:00 |
01:09:19.45 |
-71:05:40.9 |
HIP 5107 |
21.24 |
| 2026-04-13 12:00 |
01:09:27.26 |
-71:05:41.6 |
HIP 5107 |
21.81 |
| 2026-04-14 00:00 |
01:09:35.06 |
-71:05:42.7 |
HIP 5695 |
22.13 |
| 2026-04-14 12:00 |
01:09:42.86 |
-71:05:44.1 |
HIP 5695 |
21.62 |
| 2026-04-15 00:00 |
01:09:50.65 |
-71:05:45.8 |
HIP 5695 |
21.14 |
| 2026-04-15 12:00 |
01:09:58.44 |
-71:05:47.8 |
HIP 5695 |
20.66 |
| 2026-04-16 00:00 |
01:10:06.22 |
-71:05:50.2 |
HIP 5695 |
20.19 |