C/2001 HT50 (LINEAR-NEAT)
| Parameter |
Value |
| Designation |
C/2001 HT50 (LINEAR-NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-07-09T00:34:23.802240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:09Z |
| Obs used |
3866 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
7.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-11-01.0000000 |
| e |
0.99766027 |
| q (au) |
2.792083 |
| a (au) |
1193.337554 |
| i (deg) |
163.212126 |
| Ω (om, deg) |
42.912495 |
| ω (w, deg) |
324.071020 |
| M (ma, deg) |
0.002749 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.009 + 3.500\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.009 |
| n |
3.500 |
| gf |
1.000 |
| gb |
-0.552 |
| 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 |
19:10:30.07 |
-07:24:04.9 |
HIP 94241 |
7.89 |
| 2026-02-03 12:00 |
19:10:32.40 |
-07:23:56.2 |
HIP 94241 |
7.36 |
| 2026-02-04 00:00 |
19:10:34.72 |
-07:23:47.3 |
HIP 94241 |
6.84 |
| 2026-02-04 12:00 |
19:10:37.02 |
-07:23:38.4 |
HIP 94241 |
6.34 |
| 2026-02-05 00:00 |
19:10:39.31 |
-07:23:29.4 |
HIP 94241 |
5.85 |
| 2026-02-05 12:00 |
19:10:41.60 |
-07:23:20.3 |
HIP 94241 |
5.39 |
| 2026-02-06 00:00 |
19:10:43.87 |
-07:23:11.2 |
HIP 94241 |
4.96 |
| 2026-02-06 12:00 |
19:10:46.12 |
-07:23:02.1 |
HIP 94241 |
4.57 |
| 2026-02-07 00:00 |
19:10:48.37 |
-07:22:52.8 |
HIP 94241 |
4.23 |
| 2026-02-07 12:00 |
19:10:50.60 |
-07:22:43.5 |
HIP 94241 |
3.94 |
| 2026-02-08 00:00 |
19:10:52.82 |
-07:22:34.2 |
HIP 94241 |
3.72 |
| 2026-02-08 12:00 |
19:10:55.03 |
-07:22:24.7 |
HIP 94241 |
3.58 |
| 2026-02-09 00:00 |
19:10:57.23 |
-07:22:15.3 |
HIP 94241 |
3.54 |
| 2026-02-09 12:00 |
19:10:59.41 |
-07:22:05.7 |
HIP 94241 |
3.58 |
| 2026-02-10 00:00 |
19:11:01.58 |
-07:21:56.1 |
HIP 94241 |
3.71 |
| 2026-02-10 12:00 |
19:11:03.73 |
-07:21:46.5 |
HIP 94241 |
3.92 |
| 2026-02-11 00:00 |
19:11:05.87 |
-07:21:36.8 |
HIP 94241 |
4.19 |
| 2026-02-11 12:00 |
19:11:08.00 |
-07:21:27.0 |
HIP 94241 |
4.52 |
| 2026-02-12 00:00 |
19:11:10.11 |
-07:21:17.2 |
HIP 94241 |
4.88 |
| 2026-02-12 12:00 |
19:11:12.21 |
-07:21:07.4 |
HIP 94241 |
5.28 |
| 2026-02-13 00:00 |
19:11:14.30 |
-07:20:57.4 |
HIP 94241 |
5.69 |
| 2026-02-13 12:00 |
19:11:16.37 |
-07:20:47.5 |
HIP 94241 |
6.13 |
| 2026-02-14 00:00 |
19:11:18.42 |
-07:20:37.5 |
HIP 94241 |
6.58 |
| 2026-02-14 12:00 |
19:11:20.47 |
-07:20:27.4 |
HIP 94241 |
7.04 |
| 2026-02-15 00:00 |
19:11:22.49 |
-07:20:17.3 |
HIP 94241 |
7.51 |
| 2026-02-15 12:00 |
19:11:24.50 |
-07:20:07.1 |
HIP 94241 |
7.98 |
| 2026-02-16 00:00 |
19:11:26.50 |
-07:19:56.9 |
HIP 94241 |
8.46 |
| 2026-02-16 12:00 |
19:11:28.48 |
-07:19:46.6 |
HIP 94241 |
8.94 |
| 2026-02-17 00:00 |
19:11:30.44 |
-07:19:36.3 |
HIP 94241 |
9.42 |
| 2026-02-17 12:00 |
19:11:32.39 |
-07:19:25.9 |
HIP 94241 |
9.91 |
| 2026-02-18 00:00 |
19:11:34.32 |
-07:19:15.5 |
HIP 94241 |
10.39 |
| 2026-02-18 12:00 |
19:11:36.24 |
-07:19:05.1 |
HIP 94241 |
10.87 |
| 2026-02-19 00:00 |
19:11:38.14 |
-07:18:54.6 |
HIP 94241 |
11.36 |
| 2026-02-19 12:00 |
19:11:40.02 |
-07:18:44.1 |
HIP 94241 |
11.84 |
| 2026-02-20 00:00 |
19:11:41.88 |
-07:18:33.5 |
HIP 94241 |
12.31 |
| 2026-02-20 12:00 |
19:11:43.73 |
-07:18:22.9 |
HIP 94241 |
12.79 |
| 2026-02-21 00:00 |
19:11:45.57 |
-07:18:12.3 |
HIP 94241 |
13.27 |
| 2026-02-21 12:00 |
19:11:47.38 |
-07:18:01.6 |
HIP 94241 |
13.74 |
| 2026-02-22 00:00 |
19:11:49.18 |
-07:17:50.9 |
HIP 94241 |
14.21 |
| 2026-02-22 12:00 |
19:11:50.96 |
-07:17:40.1 |
HIP 94241 |
14.68 |
| 2026-02-23 00:00 |
19:11:52.72 |
-07:17:29.3 |
HIP 94241 |
15.14 |
| 2026-02-23 12:00 |
19:11:54.47 |
-07:17:18.5 |
HIP 94241 |
15.61 |
| 2026-02-24 00:00 |
19:11:56.19 |
-07:17:07.6 |
HIP 94241 |
16.06 |