C/2005 H1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2005 H1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-10-28T12:40:07.613760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:48Z |
| Obs used |
169 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-05-28.0000000 |
| e |
0.89692366 |
| q (au) |
4.768597 |
| a (au) |
46.262766 |
| i (deg) |
81.512268 |
| Ω (om, deg) |
71.490714 |
| ω (w, deg) |
95.212944 |
| M (ma, deg) |
0.662384 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.636 + 5.458\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.636 |
| n |
5.458 |
| gf |
0.968 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.772 |
| 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 |
17:37:34.88 |
-82:20:18.8 |
HIP 86210 |
5.62 |
| 2026-02-03 12:00 |
17:37:52.45 |
-82:20:57.3 |
HIP 86210 |
5.15 |
| 2026-02-04 00:00 |
17:38:09.90 |
-82:21:36.0 |
HIP 86210 |
4.79 |
| 2026-02-04 12:00 |
17:38:27.23 |
-82:22:14.8 |
HIP 86210 |
4.55 |
| 2026-02-05 00:00 |
17:38:44.44 |
-82:22:53.9 |
HIP 86210 |
4.47 |
| 2026-02-05 12:00 |
17:39:01.52 |
-82:23:33.2 |
HIP 86210 |
4.55 |
| 2026-02-06 00:00 |
17:39:18.48 |
-82:24:12.7 |
HIP 86210 |
4.78 |
| 2026-02-06 12:00 |
17:39:35.31 |
-82:24:52.4 |
HIP 86210 |
5.14 |
| 2026-02-07 00:00 |
17:39:52.01 |
-82:25:32.3 |
HIP 86210 |
5.61 |
| 2026-02-07 12:00 |
17:40:08.59 |
-82:26:12.4 |
HIP 86210 |
6.15 |
| 2026-02-08 00:00 |
17:40:25.03 |
-82:26:52.7 |
HIP 86210 |
6.76 |
| 2026-02-08 12:00 |
17:40:41.34 |
-82:27:33.1 |
HIP 86210 |
7.41 |
| 2026-02-09 00:00 |
17:40:57.51 |
-82:28:13.8 |
HIP 86210 |
8.10 |
| 2026-02-09 12:00 |
17:41:13.55 |
-82:28:54.6 |
HIP 86210 |
8.81 |
| 2026-02-10 00:00 |
17:41:29.45 |
-82:29:35.7 |
HIP 86210 |
9.54 |
| 2026-02-10 12:00 |
17:41:45.22 |
-82:30:16.9 |
HIP 86210 |
10.29 |
| 2026-02-11 00:00 |
17:42:00.84 |
-82:30:58.3 |
HIP 86210 |
11.05 |
| 2026-02-11 12:00 |
17:42:16.32 |
-82:31:39.9 |
HIP 86210 |
11.83 |
| 2026-02-12 00:00 |
17:42:31.66 |
-82:32:21.7 |
HIP 86210 |
12.60 |
| 2026-02-12 12:00 |
17:42:46.85 |
-82:33:03.6 |
HIP 86210 |
13.39 |
| 2026-02-13 00:00 |
17:43:01.90 |
-82:33:45.8 |
HIP 86210 |
14.18 |
| 2026-02-13 12:00 |
17:43:16.80 |
-82:34:28.1 |
HIP 86210 |
14.97 |
| 2026-02-14 00:00 |
17:43:31.55 |
-82:35:10.5 |
HIP 87165 |
14.79 |
| 2026-02-14 12:00 |
17:43:46.15 |
-82:35:53.2 |
HIP 87165 |
13.94 |
| 2026-02-15 00:00 |
17:44:00.60 |
-82:36:36.0 |
HIP 87165 |
13.10 |
| 2026-02-15 12:00 |
17:44:14.89 |
-82:37:19.0 |
HIP 87165 |
12.25 |
| 2026-02-16 00:00 |
17:44:29.03 |
-82:38:02.2 |
HIP 87165 |
11.41 |
| 2026-02-16 12:00 |
17:44:43.01 |
-82:38:45.5 |
HIP 87165 |
10.58 |
| 2026-02-17 00:00 |
17:44:56.83 |
-82:39:29.0 |
HIP 87165 |
9.75 |
| 2026-02-17 12:00 |
17:45:10.49 |
-82:40:12.7 |
HIP 87165 |
8.92 |
| 2026-02-18 00:00 |
17:45:23.98 |
-82:40:56.5 |
HIP 87165 |
8.11 |
| 2026-02-18 12:00 |
17:45:37.32 |
-82:41:40.4 |
HIP 87165 |
7.30 |
| 2026-02-19 00:00 |
17:45:50.49 |
-82:42:24.6 |
HIP 87165 |
6.51 |
| 2026-02-19 12:00 |
17:46:03.49 |
-82:43:08.8 |
HIP 87165 |
5.73 |
| 2026-02-20 00:00 |
17:46:16.32 |
-82:43:53.3 |
HIP 87165 |
4.98 |
| 2026-02-20 12:00 |
17:46:28.98 |
-82:44:37.8 |
HIP 87165 |
4.28 |
| 2026-02-21 00:00 |
17:46:41.47 |
-82:45:22.6 |
HIP 87165 |
3.63 |
| 2026-02-21 12:00 |
17:46:53.79 |
-82:46:07.4 |
HIP 87165 |
3.09 |
| 2026-02-22 00:00 |
17:47:05.94 |
-82:46:52.4 |
HIP 87165 |
2.72 |
| 2026-02-22 12:00 |
17:47:17.91 |
-82:47:37.6 |
HIP 87165 |
2.59 |
| 2026-02-23 00:00 |
17:47:29.70 |
-82:48:22.8 |
HIP 87165 |
2.73 |
| 2026-02-23 12:00 |
17:47:41.31 |
-82:49:08.3 |
HIP 87165 |
3.11 |
| 2026-02-24 00:00 |
17:47:52.74 |
-82:49:53.8 |
HIP 87165 |
3.64 |