| 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) |
| 2026-06-01 00:00 |
01:20:34.61 |
-71:31:56.8 |
HIP 6218 |
16.72 |
| 2026-06-01 12:00 |
01:20:39.87 |
-71:32:27.0 |
HIP 6218 |
16.34 |
| 2026-06-02 00:00 |
01:20:45.07 |
-71:32:57.4 |
HIP 6218 |
15.98 |
| 2026-06-02 12:00 |
01:20:50.23 |
-71:33:28.1 |
HIP 6218 |
15.62 |
| 2026-06-03 00:00 |
01:20:55.34 |
-71:33:59.0 |
HIP 6218 |
15.28 |
| 2026-06-03 12:00 |
01:21:00.40 |
-71:34:30.2 |
HIP 6218 |
14.96 |
| 2026-06-04 00:00 |
01:21:05.42 |
-71:35:01.5 |
HIP 6218 |
14.65 |
| 2026-06-04 12:00 |
01:21:10.38 |
-71:35:33.1 |
HIP 6218 |
14.36 |
| 2026-06-05 00:00 |
01:21:15.30 |
-71:36:04.9 |
HIP 6218 |
14.09 |
| 2026-06-05 12:00 |
01:21:20.17 |
-71:36:37.0 |
HIP 6218 |
13.84 |
| 2026-06-06 00:00 |
01:21:24.99 |
-71:37:09.3 |
HIP 6218 |
13.62 |
| 2026-06-06 12:00 |
01:21:29.75 |
-71:37:41.8 |
HIP 6218 |
13.41 |
| 2026-06-07 00:00 |
01:21:34.47 |
-71:38:14.5 |
HIP 6218 |
13.23 |
| 2026-06-07 12:00 |
01:21:39.14 |
-71:38:47.4 |
HIP 6218 |
13.08 |
| 2026-06-08 00:00 |
01:21:43.76 |
-71:39:20.6 |
HIP 6218 |
12.95 |
| 2026-06-08 12:00 |
01:21:48.32 |
-71:39:53.9 |
HIP 6218 |
12.84 |
| 2026-06-09 00:00 |
01:21:52.84 |
-71:40:27.5 |
HIP 6218 |
12.77 |
| 2026-06-09 12:00 |
01:21:57.30 |
-71:41:01.3 |
HIP 6218 |
12.72 |
| 2026-06-10 00:00 |
01:22:01.71 |
-71:41:35.3 |
HIP 6218 |
12.70 |
| 2026-06-10 12:00 |
01:22:06.06 |
-71:42:09.5 |
HIP 6218 |
12.71 |
| 2026-06-11 00:00 |
01:22:10.36 |
-71:42:43.9 |
HIP 6218 |
12.75 |
| 2026-06-11 12:00 |
01:22:14.61 |
-71:43:18.5 |
HIP 6218 |
12.82 |
| 2026-06-12 00:00 |
01:22:18.80 |
-71:43:53.3 |
HIP 6218 |
12.92 |
| 2026-06-12 12:00 |
01:22:22.94 |
-71:44:28.4 |
HIP 6218 |
13.05 |
| 2026-06-13 00:00 |
01:22:27.02 |
-71:45:03.6 |
HIP 6218 |
13.20 |
| 2026-06-13 12:00 |
01:22:31.05 |
-71:45:39.0 |
HIP 6218 |
13.38 |
| 2026-06-14 00:00 |
01:22:35.02 |
-71:46:14.6 |
HIP 6218 |
13.58 |
| 2026-06-14 12:00 |
01:22:38.94 |
-71:46:50.3 |
HIP 6218 |
13.81 |
| 2026-06-15 00:00 |
01:22:42.80 |
-71:47:26.3 |
HIP 6218 |
14.07 |
| 2026-06-15 12:00 |
01:22:46.60 |
-71:48:02.5 |
HIP 6218 |
14.34 |
| 2026-06-16 00:00 |
01:22:50.34 |
-71:48:38.8 |
HIP 6218 |
14.64 |
| 2026-06-16 12:00 |
01:22:54.03 |
-71:49:15.3 |
HIP 6218 |
14.95 |
| 2026-06-17 00:00 |
01:22:57.66 |
-71:49:52.0 |
HIP 6218 |
15.29 |
| 2026-06-17 12:00 |
01:23:01.23 |
-71:50:28.9 |
HIP 6218 |
15.64 |
| 2026-06-18 00:00 |
01:23:04.74 |
-71:51:05.9 |
HIP 6218 |
16.01 |
| 2026-06-18 12:00 |
01:23:08.19 |
-71:51:43.1 |
HIP 6218 |
16.39 |
| 2026-06-19 00:00 |
01:23:11.58 |
-71:52:20.5 |
HIP 6218 |
16.79 |
| 2026-06-19 12:00 |
01:23:14.92 |
-71:52:58.0 |
HIP 6218 |
17.20 |
| 2026-06-20 00:00 |
01:23:18.19 |
-71:53:35.7 |
HIP 6218 |
17.62 |
| 2026-06-20 12:00 |
01:23:21.40 |
-71:54:13.5 |
HIP 6218 |
18.06 |
| 2026-06-21 00:00 |
01:23:24.55 |
-71:54:51.5 |
HIP 6218 |
18.50 |
| 2026-06-21 12:00 |
01:23:27.64 |
-71:55:29.7 |
HIP 6218 |
18.96 |
| 2026-06-22 00:00 |
01:23:30.67 |
-71:56:08.0 |
HIP 6218 |
19.42 |