| 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) |
| 2026-07-29 00:00 |
19:05:12.06 |
-06:55:35.4 |
HIP 93751 |
8.50 |
| 2026-07-29 12:00 |
19:05:09.31 |
-06:55:44.3 |
HIP 93751 |
8.94 |
| 2026-07-30 00:00 |
19:05:06.56 |
-06:55:53.2 |
HIP 93751 |
9.41 |
| 2026-07-30 12:00 |
19:05:03.83 |
-06:56:02.3 |
HIP 93751 |
9.90 |
| 2026-07-31 00:00 |
19:05:01.10 |
-06:56:11.3 |
HIP 93751 |
10.42 |
| 2026-07-31 12:00 |
19:04:58.39 |
-06:56:20.5 |
HIP 93751 |
10.96 |
| 2026-08-01 00:00 |
19:04:55.68 |
-06:56:29.7 |
HIP 93751 |
11.51 |
| 2026-08-01 12:00 |
19:04:52.98 |
-06:56:39.0 |
HIP 93724 |
11.99 |
| 2026-08-02 00:00 |
19:04:50.30 |
-06:56:48.4 |
HIP 93724 |
11.96 |
| 2026-08-02 12:00 |
19:04:47.62 |
-06:56:57.9 |
HIP 93724 |
11.96 |
| 2026-08-03 00:00 |
19:04:44.96 |
-06:57:07.4 |
HIP 93724 |
12.00 |
| 2026-08-03 12:00 |
19:04:42.30 |
-06:57:16.9 |
HIP 93724 |
12.07 |
| 2026-08-04 00:00 |
19:04:39.66 |
-06:57:26.6 |
HIP 93724 |
12.18 |
| 2026-08-04 12:00 |
19:04:37.03 |
-06:57:36.3 |
HIP 93724 |
12.32 |
| 2026-08-05 00:00 |
19:04:34.41 |
-06:57:46.1 |
HIP 93724 |
12.50 |
| 2026-08-05 12:00 |
19:04:31.80 |
-06:57:55.9 |
HIP 93724 |
12.70 |
| 2026-08-06 00:00 |
19:04:29.20 |
-06:58:05.8 |
HIP 93724 |
12.94 |
| 2026-08-06 12:00 |
19:04:26.61 |
-06:58:15.8 |
HIP 93724 |
13.20 |
| 2026-08-07 00:00 |
19:04:24.04 |
-06:58:25.8 |
HIP 93724 |
13.49 |
| 2026-08-07 12:00 |
19:04:21.47 |
-06:58:35.9 |
HIP 93724 |
13.79 |
| 2026-08-08 00:00 |
19:04:18.92 |
-06:58:46.0 |
HIP 93724 |
14.12 |
| 2026-08-08 12:00 |
19:04:16.39 |
-06:58:56.2 |
HIP 93724 |
14.47 |
| 2026-08-09 00:00 |
19:04:13.86 |
-06:59:06.5 |
HIP 93724 |
14.84 |
| 2026-08-09 12:00 |
19:04:11.35 |
-06:59:16.9 |
HIP 93724 |
15.22 |
| 2026-08-10 00:00 |
19:04:08.85 |
-06:59:27.2 |
HIP 93724 |
15.62 |
| 2026-08-10 12:00 |
19:04:06.36 |
-06:59:37.7 |
HIP 93724 |
16.03 |
| 2026-08-11 00:00 |
19:04:03.89 |
-06:59:48.2 |
HIP 93724 |
16.45 |
| 2026-08-11 12:00 |
19:04:01.43 |
-06:59:58.8 |
HIP 93724 |
16.88 |
| 2026-08-12 00:00 |
19:03:58.99 |
-07:00:09.4 |
HIP 93724 |
17.32 |
| 2026-08-12 12:00 |
19:03:56.56 |
-07:00:20.0 |
HIP 93724 |
17.77 |
| 2026-08-13 00:00 |
19:03:54.14 |
-07:00:30.8 |
HIP 93724 |
18.22 |
| 2026-08-13 12:00 |
19:03:51.74 |
-07:00:41.5 |
HIP 93724 |
18.68 |
| 2026-08-14 00:00 |
19:03:49.35 |
-07:00:52.4 |
HIP 93724 |
19.15 |
| 2026-08-14 12:00 |
19:03:46.98 |
-07:01:03.2 |
HIP 93724 |
19.62 |
| 2026-08-15 00:00 |
19:03:44.62 |
-07:01:14.2 |
HIP 93724 |
20.10 |
| 2026-08-15 12:00 |
19:03:42.28 |
-07:01:25.2 |
HIP 93724 |
20.57 |
| 2026-08-16 00:00 |
19:03:39.95 |
-07:01:36.2 |
HIP 93724 |
21.06 |
| 2026-08-16 12:00 |
19:03:37.64 |
-07:01:47.3 |
HIP 93724 |
21.54 |
| 2026-08-17 00:00 |
19:03:35.35 |
-07:01:58.4 |
HIP 93722 |
22.02 |
| 2026-08-17 12:00 |
19:03:33.07 |
-07:02:09.5 |
HIP 93722 |
22.50 |
| 2026-08-18 00:00 |
19:03:30.80 |
-07:02:20.8 |
HIP 93722 |
22.99 |
| 2026-08-18 12:00 |
19:03:28.55 |
-07:02:32.0 |
HIP 93722 |
23.47 |
| 2026-08-19 00:00 |
19:03:26.32 |
-07:02:43.3 |
HIP 93722 |
23.95 |