| 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) |
| 2026-07-29 00:00 |
02:49:30.11 |
+24:27:58.6 |
HIP 13120 |
38.01 |
| 2026-07-29 12:00 |
02:49:35.92 |
+24:28:53.4 |
HIP 13120 |
37.51 |
| 2026-07-30 00:00 |
02:49:41.63 |
+24:29:47.9 |
HIP 13120 |
37.07 |
| 2026-07-30 12:00 |
02:49:47.23 |
+24:30:42.0 |
HIP 13120 |
36.69 |
| 2026-07-31 00:00 |
02:49:52.72 |
+24:31:35.7 |
HIP 13120 |
36.37 |
| 2026-07-31 12:00 |
02:49:58.10 |
+24:32:29.1 |
HIP 13120 |
36.10 |
| 2026-08-01 00:00 |
02:50:03.38 |
+24:33:22.1 |
HIP 13120 |
35.89 |
| 2026-08-01 12:00 |
02:50:08.55 |
+24:34:14.8 |
HIP 13120 |
35.73 |
| 2026-08-02 00:00 |
02:50:13.61 |
+24:35:07.0 |
HIP 13120 |
35.63 |
| 2026-08-02 12:00 |
02:50:18.56 |
+24:35:58.9 |
HIP 13120 |
35.57 |
| 2026-08-03 00:00 |
02:50:23.40 |
+24:36:50.4 |
HIP 13120 |
35.55 |
| 2026-08-03 12:00 |
02:50:28.12 |
+24:37:41.6 |
HIP 13120 |
35.58 |
| 2026-08-04 00:00 |
02:50:32.74 |
+24:38:32.3 |
HIP 13120 |
35.65 |
| 2026-08-04 12:00 |
02:50:37.25 |
+24:39:22.7 |
HIP 13120 |
35.76 |
| 2026-08-05 00:00 |
02:50:41.64 |
+24:40:12.7 |
HIP 13120 |
35.90 |
| 2026-08-05 12:00 |
02:50:45.92 |
+24:41:02.3 |
HIP 13120 |
36.07 |
| 2026-08-06 00:00 |
02:50:50.08 |
+24:41:51.5 |
HIP 13382 |
35.38 |
| 2026-08-06 12:00 |
02:50:54.13 |
+24:42:40.2 |
HIP 13382 |
34.20 |
| 2026-08-07 00:00 |
02:50:58.07 |
+24:43:28.6 |
HIP 13382 |
33.05 |
| 2026-08-07 12:00 |
02:51:01.89 |
+24:44:16.6 |
HIP 13382 |
31.92 |
| 2026-08-08 00:00 |
02:51:05.60 |
+24:45:04.2 |
HIP 13382 |
30.82 |
| 2026-08-08 12:00 |
02:51:09.19 |
+24:45:51.3 |
HIP 13382 |
29.74 |
| 2026-08-09 00:00 |
02:51:12.66 |
+24:46:38.1 |
HIP 13382 |
28.68 |
| 2026-08-09 12:00 |
02:51:16.01 |
+24:47:24.4 |
HIP 13382 |
27.64 |
| 2026-08-10 00:00 |
02:51:19.25 |
+24:48:10.3 |
HIP 13382 |
26.62 |
| 2026-08-10 12:00 |
02:51:22.37 |
+24:48:55.7 |
HIP 13382 |
25.63 |
| 2026-08-11 00:00 |
02:51:25.37 |
+24:49:40.7 |
HIP 13382 |
24.65 |
| 2026-08-11 12:00 |
02:51:28.25 |
+24:50:25.3 |
HIP 13382 |
23.70 |
| 2026-08-12 00:00 |
02:51:31.01 |
+24:51:09.5 |
HIP 13382 |
22.77 |
| 2026-08-12 12:00 |
02:51:33.65 |
+24:51:53.2 |
HIP 13382 |
21.86 |
| 2026-08-13 00:00 |
02:51:36.17 |
+24:52:36.5 |
HIP 13382 |
20.98 |
| 2026-08-13 12:00 |
02:51:38.56 |
+24:53:19.3 |
HIP 13382 |
20.11 |
| 2026-08-14 00:00 |
02:51:40.84 |
+24:54:01.7 |
HIP 13382 |
19.26 |
| 2026-08-14 12:00 |
02:51:42.99 |
+24:54:43.6 |
HIP 13382 |
18.43 |
| 2026-08-15 00:00 |
02:51:45.02 |
+24:55:25.1 |
HIP 13382 |
17.62 |
| 2026-08-15 12:00 |
02:51:46.93 |
+24:56:06.1 |
HIP 13382 |
16.83 |
| 2026-08-16 00:00 |
02:51:48.72 |
+24:56:46.6 |
HIP 13382 |
16.05 |
| 2026-08-16 12:00 |
02:51:50.38 |
+24:57:26.7 |
HIP 13382 |
15.30 |
| 2026-08-17 00:00 |
02:51:51.92 |
+24:58:06.3 |
HIP 13382 |
14.56 |
| 2026-08-17 12:00 |
02:51:53.34 |
+24:58:45.4 |
HIP 13382 |
13.84 |
| 2026-08-18 00:00 |
02:51:54.63 |
+24:59:24.1 |
HIP 13382 |
13.14 |
| 2026-08-18 12:00 |
02:51:55.80 |
+25:00:02.3 |
HIP 13382 |
12.45 |
| 2026-08-19 00:00 |
02:51:56.84 |
+25:00:40.0 |
HIP 13382 |
11.78 |