| 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) |
| 2026-05-12 00:00 |
19:12:01.34 |
-06:51:23.9 |
HIP 94236 |
21.07 |
| 2026-05-12 12:00 |
19:11:59.62 |
-06:51:18.0 |
HIP 94236 |
20.69 |
| 2026-05-13 00:00 |
19:11:57.87 |
-06:51:12.1 |
HIP 94236 |
20.30 |
| 2026-05-13 12:00 |
19:11:56.11 |
-06:51:06.3 |
HIP 94236 |
19.92 |
| 2026-05-14 00:00 |
19:11:54.33 |
-06:51:00.7 |
HIP 94236 |
19.54 |
| 2026-05-14 12:00 |
19:11:52.53 |
-06:50:55.1 |
HIP 94236 |
19.15 |
| 2026-05-15 00:00 |
19:11:50.71 |
-06:50:49.5 |
HIP 94236 |
18.77 |
| 2026-05-15 12:00 |
19:11:48.87 |
-06:50:44.1 |
HIP 94236 |
18.39 |
| 2026-05-16 00:00 |
19:11:47.01 |
-06:50:38.8 |
HIP 94236 |
18.01 |
| 2026-05-16 12:00 |
19:11:45.13 |
-06:50:33.6 |
HIP 94236 |
17.64 |
| 2026-05-17 00:00 |
19:11:43.23 |
-06:50:28.4 |
HIP 94236 |
17.26 |
| 2026-05-17 12:00 |
19:11:41.32 |
-06:50:23.4 |
HIP 94236 |
16.90 |
| 2026-05-18 00:00 |
19:11:39.38 |
-06:50:18.4 |
HIP 94236 |
16.53 |
| 2026-05-18 12:00 |
19:11:37.43 |
-06:50:13.5 |
HIP 94236 |
16.17 |
| 2026-05-19 00:00 |
19:11:35.46 |
-06:50:08.8 |
HIP 94236 |
15.82 |
| 2026-05-19 12:00 |
19:11:33.46 |
-06:50:04.1 |
HIP 94236 |
15.47 |
| 2026-05-20 00:00 |
19:11:31.45 |
-06:49:59.5 |
HIP 94236 |
15.13 |
| 2026-05-20 12:00 |
19:11:29.43 |
-06:49:55.0 |
HIP 94236 |
14.80 |
| 2026-05-21 00:00 |
19:11:27.38 |
-06:49:50.6 |
HIP 94236 |
14.47 |
| 2026-05-21 12:00 |
19:11:25.32 |
-06:49:46.3 |
HIP 94236 |
14.16 |
| 2026-05-22 00:00 |
19:11:23.24 |
-06:49:42.1 |
HIP 94236 |
13.86 |
| 2026-05-22 12:00 |
19:11:21.14 |
-06:49:38.0 |
HIP 94236 |
13.57 |
| 2026-05-23 00:00 |
19:11:19.03 |
-06:49:34.0 |
HIP 94236 |
13.30 |
| 2026-05-23 12:00 |
19:11:16.89 |
-06:49:30.1 |
HIP 94236 |
13.04 |
| 2026-05-24 00:00 |
19:11:14.74 |
-06:49:26.2 |
HIP 94236 |
12.80 |
| 2026-05-24 12:00 |
19:11:12.58 |
-06:49:22.5 |
HIP 94236 |
12.58 |
| 2026-05-25 00:00 |
19:11:10.39 |
-06:49:18.9 |
HIP 94236 |
12.38 |
| 2026-05-25 12:00 |
19:11:08.20 |
-06:49:15.4 |
HIP 94236 |
12.20 |
| 2026-05-26 00:00 |
19:11:05.98 |
-06:49:11.9 |
HIP 94236 |
12.04 |
| 2026-05-26 12:00 |
19:11:03.75 |
-06:49:08.6 |
HIP 94236 |
11.91 |
| 2026-05-27 00:00 |
19:11:01.50 |
-06:49:05.4 |
HIP 94236 |
11.81 |
| 2026-05-27 12:00 |
19:10:59.24 |
-06:49:02.2 |
HIP 94236 |
11.73 |
| 2026-05-28 00:00 |
19:10:56.96 |
-06:48:59.2 |
HIP 94236 |
11.68 |
| 2026-05-28 12:00 |
19:10:54.66 |
-06:48:56.2 |
HIP 94236 |
11.66 |
| 2026-05-29 00:00 |
19:10:52.35 |
-06:48:53.4 |
HIP 94236 |
11.67 |
| 2026-05-29 12:00 |
19:10:50.03 |
-06:48:50.7 |
HIP 94236 |
11.72 |
| 2026-05-30 00:00 |
19:10:47.69 |
-06:48:48.0 |
HIP 94236 |
11.79 |
| 2026-05-30 12:00 |
19:10:45.33 |
-06:48:45.5 |
HIP 94236 |
11.89 |
| 2026-05-31 00:00 |
19:10:42.96 |
-06:48:43.0 |
HIP 94236 |
12.02 |
| 2026-05-31 12:00 |
19:10:40.58 |
-06:48:40.7 |
HIP 94236 |
12.19 |
| 2026-06-01 00:00 |
19:10:38.18 |
-06:48:38.4 |
HIP 94236 |
12.38 |
| 2026-06-01 12:00 |
19:10:35.76 |
-06:48:36.3 |
HIP 94236 |
12.60 |
| 2026-06-02 00:00 |
19:10:33.33 |
-06:48:34.2 |
HIP 94236 |
12.85 |