| 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) |
| 2026-09-20 00:00 |
01:13:56.48 |
-73:45:29.9 |
HIP 5623 |
11.59 |
| 2026-09-20 12:00 |
01:13:47.78 |
-73:45:48.8 |
HIP 5623 |
10.96 |
| 2026-09-21 00:00 |
01:13:39.05 |
-73:46:07.3 |
HIP 5623 |
10.35 |
| 2026-09-21 12:00 |
01:13:30.29 |
-73:46:25.4 |
HIP 5623 |
9.75 |
| 2026-09-22 00:00 |
01:13:21.50 |
-73:46:43.2 |
HIP 5623 |
9.16 |
| 2026-09-22 12:00 |
01:13:12.67 |
-73:47:00.7 |
HIP 5623 |
8.59 |
| 2026-09-23 00:00 |
01:13:03.81 |
-73:47:17.8 |
HIP 5623 |
8.04 |
| 2026-09-23 12:00 |
01:12:54.93 |
-73:47:34.6 |
HIP 5623 |
7.52 |
| 2026-09-24 00:00 |
01:12:46.01 |
-73:47:51.0 |
HIP 5623 |
7.03 |
| 2026-09-24 12:00 |
01:12:37.06 |
-73:48:07.1 |
HIP 5623 |
6.58 |
| 2026-09-25 00:00 |
01:12:28.09 |
-73:48:22.8 |
HIP 5623 |
6.17 |
| 2026-09-25 12:00 |
01:12:19.09 |
-73:48:38.1 |
HIP 5623 |
5.82 |
| 2026-09-26 00:00 |
01:12:10.07 |
-73:48:53.1 |
HIP 5623 |
5.54 |
| 2026-09-26 12:00 |
01:12:01.01 |
-73:49:07.7 |
HIP 5623 |
5.34 |
| 2026-09-27 00:00 |
01:11:51.94 |
-73:49:22.0 |
HIP 5623 |
5.22 |
| 2026-09-27 12:00 |
01:11:42.84 |
-73:49:35.9 |
HIP 5623 |
5.19 |
| 2026-09-28 00:00 |
01:11:33.72 |
-73:49:49.5 |
HIP 5623 |
5.26 |
| 2026-09-28 12:00 |
01:11:24.57 |
-73:50:02.7 |
HIP 5623 |
5.42 |
| 2026-09-29 00:00 |
01:11:15.40 |
-73:50:15.5 |
HIP 5623 |
5.65 |
| 2026-09-29 12:00 |
01:11:06.21 |
-73:50:28.0 |
HIP 5623 |
5.96 |
| 2026-09-30 00:00 |
01:10:57.01 |
-73:50:40.1 |
HIP 5623 |
6.33 |
| 2026-09-30 12:00 |
01:10:47.78 |
-73:50:51.8 |
HIP 5623 |
6.75 |
| 2026-10-01 00:00 |
01:10:38.53 |
-73:51:03.2 |
HIP 5623 |
7.21 |
| 2026-10-01 12:00 |
01:10:29.27 |
-73:51:14.2 |
HIP 5623 |
7.71 |
| 2026-10-02 00:00 |
01:10:19.99 |
-73:51:24.8 |
HIP 5623 |
8.23 |
| 2026-10-02 12:00 |
01:10:10.69 |
-73:51:35.1 |
HIP 5623 |
8.78 |
| 2026-10-03 00:00 |
01:10:01.38 |
-73:51:45.0 |
HIP 5623 |
9.34 |
| 2026-10-03 12:00 |
01:09:52.05 |
-73:51:54.5 |
HIP 5623 |
9.92 |
| 2026-10-04 00:00 |
01:09:42.71 |
-73:52:03.7 |
HIP 5623 |
10.52 |
| 2026-10-04 12:00 |
01:09:33.35 |
-73:52:12.4 |
HIP 5623 |
11.12 |
| 2026-10-05 00:00 |
01:09:23.99 |
-73:52:20.8 |
HIP 5623 |
11.73 |
| 2026-10-05 12:00 |
01:09:14.61 |
-73:52:28.8 |
HIP 5623 |
12.35 |
| 2026-10-06 00:00 |
01:09:05.22 |
-73:52:36.5 |
HIP 5623 |
12.97 |
| 2026-10-06 12:00 |
01:08:55.83 |
-73:52:43.7 |
HIP 5623 |
13.60 |
| 2026-10-07 00:00 |
01:08:46.42 |
-73:52:50.6 |
HIP 5623 |
14.23 |
| 2026-10-07 12:00 |
01:08:37.01 |
-73:52:57.1 |
HIP 5623 |
14.87 |
| 2026-10-08 00:00 |
01:08:27.59 |
-73:53:03.2 |
HIP 5623 |
15.51 |
| 2026-10-08 12:00 |
01:08:18.16 |
-73:53:09.0 |
HIP 5623 |
16.15 |
| 2026-10-09 00:00 |
01:08:08.73 |
-73:53:14.4 |
HIP 5623 |
16.80 |
| 2026-10-09 12:00 |
01:07:59.30 |
-73:53:19.3 |
HIP 5623 |
17.44 |
| 2026-10-10 00:00 |
01:07:49.86 |
-73:53:23.9 |
HIP 5623 |
18.09 |
| 2026-10-10 12:00 |
01:07:40.42 |
-73:53:28.1 |
HIP 5623 |
18.74 |
| 2026-10-11 00:00 |
01:07:30.98 |
-73:53:32.0 |
HIP 5623 |
19.39 |