| Parameter |
Value |
| Designation |
P/2001 H5 (NEAT) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2001-01-28T16:49:48.224640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
24.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-05-03.0000000 |
| e |
0.60019118 |
| q (au) |
2.396649 |
| a (au) |
5.994487 |
| i (deg) |
8.399268 |
| Ω (om, deg) |
329.563064 |
| ω (w, deg) |
224.878306 |
| M (ma, deg) |
6.332598 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.684 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.684 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.726 |
| 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 |
02:48:39.41 |
+25:21:54.4 |
HIP 13109 |
4.36 |
| 2026-09-20 12:00 |
02:48:32.24 |
+25:21:54.4 |
HIP 13109 |
4.14 |
| 2026-09-21 00:00 |
02:48:24.96 |
+25:21:53.8 |
HIP 13109 |
4.54 |
| 2026-09-21 12:00 |
02:48:17.57 |
+25:21:52.4 |
HIP 13109 |
5.44 |
| 2026-09-22 00:00 |
02:48:10.05 |
+25:21:50.4 |
HIP 13109 |
6.66 |
| 2026-09-22 12:00 |
02:48:02.43 |
+25:21:47.8 |
HIP 13109 |
8.07 |
| 2026-09-23 00:00 |
02:47:54.68 |
+25:21:44.4 |
HIP 13109 |
9.60 |
| 2026-09-23 12:00 |
02:47:46.83 |
+25:21:40.4 |
HIP 13109 |
11.22 |
| 2026-09-24 00:00 |
02:47:38.86 |
+25:21:35.7 |
HIP 13109 |
12.90 |
| 2026-09-24 12:00 |
02:47:30.77 |
+25:21:30.4 |
HIP 13109 |
14.63 |
| 2026-09-25 00:00 |
02:47:22.58 |
+25:21:24.3 |
HIP 13109 |
16.41 |
| 2026-09-25 12:00 |
02:47:14.27 |
+25:21:17.6 |
HIP 13109 |
18.22 |
| 2026-09-26 00:00 |
02:47:05.85 |
+25:21:10.2 |
HIP 13109 |
20.07 |
| 2026-09-26 12:00 |
02:46:57.33 |
+25:21:02.2 |
HIP 12926 |
20.35 |
| 2026-09-27 00:00 |
02:46:48.69 |
+25:20:53.4 |
HIP 12926 |
19.65 |
| 2026-09-27 12:00 |
02:46:39.95 |
+25:20:44.0 |
HIP 12926 |
19.13 |
| 2026-09-28 00:00 |
02:46:31.10 |
+25:20:33.9 |
HIP 12926 |
18.80 |
| 2026-09-28 12:00 |
02:46:22.14 |
+25:20:23.1 |
HIP 12926 |
18.70 |
| 2026-09-29 00:00 |
02:46:13.08 |
+25:20:11.6 |
HIP 12926 |
18.83 |
| 2026-09-29 12:00 |
02:46:03.91 |
+25:19:59.5 |
HIP 12926 |
19.19 |
| 2026-09-30 00:00 |
02:45:54.63 |
+25:19:46.6 |
HIP 12926 |
19.78 |
| 2026-09-30 12:00 |
02:45:45.26 |
+25:19:33.1 |
HIP 12926 |
20.59 |
| 2026-10-01 00:00 |
02:45:35.78 |
+25:19:18.8 |
HIP 12926 |
21.60 |
| 2026-10-01 12:00 |
02:45:26.20 |
+25:19:03.9 |
HIP 12781 |
20.31 |
| 2026-10-02 00:00 |
02:45:16.52 |
+25:18:48.3 |
HIP 12781 |
18.80 |
| 2026-10-02 12:00 |
02:45:06.74 |
+25:18:32.0 |
HIP 12781 |
17.43 |
| 2026-10-03 00:00 |
02:44:56.86 |
+25:18:15.0 |
HIP 12781 |
16.24 |
| 2026-10-03 12:00 |
02:44:46.88 |
+25:17:57.3 |
HIP 12781 |
15.30 |
| 2026-10-04 00:00 |
02:44:36.80 |
+25:17:39.0 |
HIP 12781 |
14.66 |
| 2026-10-04 12:00 |
02:44:26.63 |
+25:17:19.9 |
HIP 12781 |
14.37 |
| 2026-10-05 00:00 |
02:44:16.37 |
+25:17:00.1 |
HIP 12781 |
14.46 |
| 2026-10-05 12:00 |
02:44:06.01 |
+25:16:39.7 |
HIP 12781 |
14.93 |
| 2026-10-06 00:00 |
02:43:55.55 |
+25:16:18.5 |
HIP 12781 |
15.77 |
| 2026-10-06 12:00 |
02:43:45.01 |
+25:15:56.7 |
HIP 12781 |
16.92 |
| 2026-10-07 00:00 |
02:43:34.38 |
+25:15:34.2 |
HIP 12781 |
18.34 |
| 2026-10-07 12:00 |
02:43:23.65 |
+25:15:11.0 |
HIP 12781 |
19.98 |
| 2026-10-08 00:00 |
02:43:12.84 |
+25:14:47.1 |
HIP 12781 |
21.79 |
| 2026-10-08 12:00 |
02:43:01.94 |
+25:14:22.5 |
HIP 12781 |
23.74 |
| 2026-10-09 00:00 |
02:42:50.96 |
+25:13:57.2 |
HIP 12781 |
25.81 |
| 2026-10-09 12:00 |
02:42:39.90 |
+25:13:31.2 |
HIP 12781 |
27.98 |
| 2026-10-10 00:00 |
02:42:28.75 |
+25:13:04.6 |
HIP 12524 |
29.60 |
| 2026-10-10 12:00 |
02:42:17.52 |
+25:12:37.3 |
HIP 12524 |
28.56 |
| 2026-10-11 00:00 |
02:42:06.20 |
+25:12:09.3 |
HIP 12524 |
27.71 |