| 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) |
| 2026-09-20 00:00 |
19:01:43.05 |
-07:15:39.0 |
HIP 93324 |
19.66 |
| 2026-09-20 12:00 |
19:01:42.13 |
-07:15:51.4 |
HIP 93324 |
19.38 |
| 2026-09-21 00:00 |
19:01:41.23 |
-07:16:03.7 |
HIP 93324 |
19.09 |
| 2026-09-21 12:00 |
19:01:40.36 |
-07:16:16.0 |
HIP 93324 |
18.82 |
| 2026-09-22 00:00 |
19:01:39.51 |
-07:16:28.3 |
HIP 93324 |
18.55 |
| 2026-09-22 12:00 |
19:01:38.69 |
-07:16:40.5 |
HIP 93324 |
18.28 |
| 2026-09-23 00:00 |
19:01:37.88 |
-07:16:52.8 |
HIP 93324 |
18.02 |
| 2026-09-23 12:00 |
19:01:37.10 |
-07:17:05.0 |
HIP 93324 |
17.77 |
| 2026-09-24 00:00 |
19:01:36.35 |
-07:17:17.2 |
HIP 93324 |
17.53 |
| 2026-09-24 12:00 |
19:01:35.62 |
-07:17:29.4 |
HIP 93324 |
17.29 |
| 2026-09-25 00:00 |
19:01:34.91 |
-07:17:41.6 |
HIP 93324 |
17.06 |
| 2026-09-25 12:00 |
19:01:34.22 |
-07:17:53.8 |
HIP 93324 |
16.83 |
| 2026-09-26 00:00 |
19:01:33.56 |
-07:18:05.9 |
HIP 93324 |
16.61 |
| 2026-09-26 12:00 |
19:01:32.92 |
-07:18:18.0 |
HIP 93324 |
16.40 |
| 2026-09-27 00:00 |
19:01:32.31 |
-07:18:30.1 |
HIP 93324 |
16.20 |
| 2026-09-27 12:00 |
19:01:31.72 |
-07:18:42.2 |
HIP 93324 |
16.00 |
| 2026-09-28 00:00 |
19:01:31.15 |
-07:18:54.2 |
HIP 93324 |
15.81 |
| 2026-09-28 12:00 |
19:01:30.60 |
-07:19:06.2 |
HIP 93324 |
15.63 |
| 2026-09-29 00:00 |
19:01:30.08 |
-07:19:18.2 |
HIP 93324 |
15.45 |
| 2026-09-29 12:00 |
19:01:29.58 |
-07:19:30.2 |
HIP 93324 |
15.28 |
| 2026-09-30 00:00 |
19:01:29.11 |
-07:19:42.1 |
HIP 93324 |
15.12 |
| 2026-09-30 12:00 |
19:01:28.66 |
-07:19:54.1 |
HIP 93324 |
14.97 |
| 2026-10-01 00:00 |
19:01:28.24 |
-07:20:05.9 |
HIP 93324 |
14.83 |
| 2026-10-01 12:00 |
19:01:27.83 |
-07:20:17.8 |
HIP 93324 |
14.69 |
| 2026-10-02 00:00 |
19:01:27.45 |
-07:20:29.6 |
HIP 93324 |
14.56 |
| 2026-10-02 12:00 |
19:01:27.10 |
-07:20:41.4 |
HIP 93324 |
14.44 |
| 2026-10-03 00:00 |
19:01:26.77 |
-07:20:53.2 |
HIP 93324 |
14.33 |
| 2026-10-03 12:00 |
19:01:26.46 |
-07:21:04.9 |
HIP 93324 |
14.22 |
| 2026-10-04 00:00 |
19:01:26.18 |
-07:21:16.6 |
HIP 93324 |
14.12 |
| 2026-10-04 12:00 |
19:01:25.92 |
-07:21:28.2 |
HIP 93324 |
14.04 |
| 2026-10-05 00:00 |
19:01:25.68 |
-07:21:39.8 |
HIP 93324 |
13.96 |
| 2026-10-05 12:00 |
19:01:25.47 |
-07:21:51.4 |
HIP 93324 |
13.88 |
| 2026-10-06 00:00 |
19:01:25.28 |
-07:22:03.0 |
HIP 93324 |
13.82 |
| 2026-10-06 12:00 |
19:01:25.12 |
-07:22:14.5 |
HIP 93324 |
13.77 |
| 2026-10-07 00:00 |
19:01:24.98 |
-07:22:26.0 |
HIP 93324 |
13.72 |
| 2026-10-07 12:00 |
19:01:24.86 |
-07:22:37.4 |
HIP 93324 |
13.68 |
| 2026-10-08 00:00 |
19:01:24.77 |
-07:22:48.8 |
HIP 93324 |
13.66 |
| 2026-10-08 12:00 |
19:01:24.70 |
-07:23:00.1 |
HIP 93324 |
13.64 |
| 2026-10-09 00:00 |
19:01:24.66 |
-07:23:11.4 |
HIP 93324 |
13.62 |
| 2026-10-09 12:00 |
19:01:24.64 |
-07:23:22.7 |
HIP 93324 |
13.62 |
| 2026-10-10 00:00 |
19:01:24.64 |
-07:23:33.9 |
HIP 93324 |
13.63 |
| 2026-10-10 12:00 |
19:01:24.67 |
-07:23:45.1 |
HIP 93324 |
13.64 |
| 2026-10-11 00:00 |
19:01:24.72 |
-07:23:56.2 |
HIP 93324 |
13.66 |