C/2004 H1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2004 H1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-01-15T07:05:39.554880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:40Z |
| Obs used |
71 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-04-19.0000000 |
| e |
0.99989721 |
| q (au) |
2.080742 |
| a (au) |
20242.963449 |
| i (deg) |
140.672988 |
| Ω (om, deg) |
120.046982 |
| ω (w, deg) |
290.524558 |
| M (ma, deg) |
0.000032 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.724 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.724 |
| n |
2.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
00:55:56.44 |
+49:00:06.9 |
HIP 4298 |
21.15 |
| 2026-02-03 12:00 |
00:55:58.17 |
+48:59:46.3 |
HIP 4298 |
20.96 |
| 2026-02-04 00:00 |
00:55:59.93 |
+48:59:26.0 |
HIP 4298 |
20.77 |
| 2026-02-04 12:00 |
00:56:01.71 |
+48:59:05.8 |
HIP 4298 |
20.60 |
| 2026-02-05 00:00 |
00:56:03.53 |
+48:58:45.9 |
HIP 4298 |
20.44 |
| 2026-02-05 12:00 |
00:56:05.37 |
+48:58:26.2 |
HIP 4298 |
20.30 |
| 2026-02-06 00:00 |
00:56:07.24 |
+48:58:06.7 |
HIP 4298 |
20.17 |
| 2026-02-06 12:00 |
00:56:09.14 |
+48:57:47.4 |
HIP 4298 |
20.06 |
| 2026-02-07 00:00 |
00:56:11.07 |
+48:57:28.4 |
HIP 4298 |
19.96 |
| 2026-02-07 12:00 |
00:56:13.02 |
+48:57:09.6 |
HIP 4298 |
19.88 |
| 2026-02-08 00:00 |
00:56:15.01 |
+48:56:51.0 |
HIP 4298 |
19.81 |
| 2026-02-08 12:00 |
00:56:17.02 |
+48:56:32.7 |
HIP 4298 |
19.76 |
| 2026-02-09 00:00 |
00:56:19.06 |
+48:56:14.5 |
HIP 4298 |
19.72 |
| 2026-02-09 12:00 |
00:56:21.12 |
+48:55:56.7 |
HIP 4298 |
19.70 |
| 2026-02-10 00:00 |
00:56:23.21 |
+48:55:39.0 |
HIP 4298 |
19.70 |
| 2026-02-10 12:00 |
00:56:25.33 |
+48:55:21.6 |
HIP 4298 |
19.71 |
| 2026-02-11 00:00 |
00:56:27.48 |
+48:55:04.4 |
HIP 4298 |
19.74 |
| 2026-02-11 12:00 |
00:56:29.66 |
+48:54:47.5 |
HIP 4298 |
19.79 |
| 2026-02-12 00:00 |
00:56:31.86 |
+48:54:30.8 |
HIP 4298 |
19.85 |
| 2026-02-12 12:00 |
00:56:34.08 |
+48:54:14.3 |
HIP 4298 |
19.93 |
| 2026-02-13 00:00 |
00:56:36.33 |
+48:53:58.1 |
HIP 4298 |
20.02 |
| 2026-02-13 12:00 |
00:56:38.61 |
+48:53:42.1 |
HIP 4298 |
20.13 |
| 2026-02-14 00:00 |
00:56:40.92 |
+48:53:26.4 |
HIP 4298 |
20.26 |
| 2026-02-14 12:00 |
00:56:43.25 |
+48:53:10.9 |
HIP 4591 |
20.25 |
| 2026-02-15 00:00 |
00:56:45.60 |
+48:52:55.7 |
HIP 4591 |
19.91 |
| 2026-02-15 12:00 |
00:56:47.98 |
+48:52:40.7 |
HIP 4591 |
19.57 |
| 2026-02-16 00:00 |
00:56:50.38 |
+48:52:25.9 |
HIP 4591 |
19.23 |
| 2026-02-16 12:00 |
00:56:52.81 |
+48:52:11.4 |
HIP 4591 |
18.89 |
| 2026-02-17 00:00 |
00:56:55.27 |
+48:51:57.1 |
HIP 4591 |
18.55 |
| 2026-02-17 12:00 |
00:56:57.74 |
+48:51:43.1 |
HIP 4591 |
18.22 |
| 2026-02-18 00:00 |
00:57:00.24 |
+48:51:29.4 |
HIP 4591 |
17.88 |
| 2026-02-18 12:00 |
00:57:02.77 |
+48:51:15.8 |
HIP 4591 |
17.54 |
| 2026-02-19 00:00 |
00:57:05.32 |
+48:51:02.6 |
HIP 4591 |
17.21 |
| 2026-02-19 12:00 |
00:57:07.89 |
+48:50:49.6 |
HIP 4591 |
16.88 |
| 2026-02-20 00:00 |
00:57:10.48 |
+48:50:36.8 |
HIP 4591 |
16.55 |
| 2026-02-20 12:00 |
00:57:13.10 |
+48:50:24.3 |
HIP 4591 |
16.22 |
| 2026-02-21 00:00 |
00:57:15.74 |
+48:50:12.1 |
HIP 4591 |
15.90 |
| 2026-02-21 12:00 |
00:57:18.40 |
+48:50:00.1 |
HIP 4591 |
15.57 |
| 2026-02-22 00:00 |
00:57:21.09 |
+48:49:48.3 |
HIP 4591 |
15.25 |
| 2026-02-22 12:00 |
00:57:23.79 |
+48:49:36.8 |
HIP 4591 |
14.94 |
| 2026-02-23 00:00 |
00:57:26.52 |
+48:49:25.6 |
HIP 4591 |
14.63 |
| 2026-02-23 12:00 |
00:57:29.27 |
+48:49:14.6 |
HIP 4591 |
14.32 |
| 2026-02-24 00:00 |
00:57:32.04 |
+48:49:03.9 |
HIP 4591 |
14.02 |