| Parameter |
Value |
| Designation |
322P/SOHO |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-04T01:32:14.300160Z |
| Orbit solution date (soln_date, UTC) |
2016-10-27T11:29:40Z |
| Obs used |
318 |
| NEO |
Yes |
| M1 |
19.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-06-06.0000000 |
| e |
0.97867648 |
| q (au) |
0.053656 |
| a (au) |
2.516261 |
| i (deg) |
12.589236 |
| Ω (om, deg) |
359.524488 |
| ω (w, deg) |
49.049477 |
| M (ma, deg) |
337.760659 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 4.648\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
4.648 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
14:39:53.38 |
-28:51:56.3 |
HIP 71688 |
13.39 |
| 2026-06-01 12:00 |
14:39:23.17 |
-28:49:09.7 |
HIP 71688 |
12.21 |
| 2026-06-02 00:00 |
14:38:53.14 |
-28:46:22.6 |
HIP 71688 |
14.86 |
| 2026-06-02 12:00 |
14:38:23.32 |
-28:43:34.9 |
HIP 71471 |
17.94 |
| 2026-06-03 00:00 |
14:37:53.69 |
-28:40:46.9 |
HIP 71471 |
11.72 |
| 2026-06-03 12:00 |
14:37:24.27 |
-28:37:58.3 |
HIP 71471 |
7.31 |
| 2026-06-04 00:00 |
14:36:55.05 |
-28:35:09.4 |
HIP 71471 |
8.27 |
| 2026-06-04 12:00 |
14:36:26.05 |
-28:32:20.0 |
HIP 71471 |
13.45 |
| 2026-06-05 00:00 |
14:35:57.26 |
-28:29:30.3 |
HIP 71471 |
19.73 |
| 2026-06-05 12:00 |
14:35:28.68 |
-28:26:40.3 |
HIP 71357 |
25.23 |
| 2026-06-06 00:00 |
14:35:00.33 |
-28:23:50.0 |
HIP 71357 |
23.58 |
| 2026-06-06 12:00 |
14:34:32.20 |
-28:20:59.5 |
HIP 71357 |
23.82 |
| 2026-06-07 00:00 |
14:34:04.29 |
-28:18:08.7 |
HIP 71122 |
19.16 |
| 2026-06-07 12:00 |
14:33:36.61 |
-28:15:17.7 |
HIP 71122 |
12.97 |
| 2026-06-08 00:00 |
14:33:09.17 |
-28:12:26.5 |
HIP 71122 |
7.77 |
| 2026-06-08 12:00 |
14:32:41.96 |
-28:09:35.2 |
HIP 71122 |
6.48 |
| 2026-06-09 00:00 |
14:32:14.98 |
-28:06:43.8 |
HIP 71122 |
10.54 |
| 2026-06-09 12:00 |
14:31:48.25 |
-28:03:52.4 |
HIP 71122 |
16.32 |
| 2026-06-10 00:00 |
14:31:21.76 |
-28:01:00.9 |
HIP 71077 |
20.83 |
| 2026-06-10 12:00 |
14:30:55.51 |
-27:58:09.3 |
HIP 71077 |
21.94 |
| 2026-06-11 00:00 |
14:30:29.51 |
-27:55:17.8 |
HIP 71077 |
24.71 |
| 2026-06-11 12:00 |
14:30:03.76 |
-27:52:26.4 |
HIP 70788 |
19.92 |
| 2026-06-12 00:00 |
14:29:38.26 |
-27:49:35.0 |
HIP 70788 |
15.17 |
| 2026-06-12 12:00 |
14:29:13.02 |
-27:46:43.7 |
HIP 70788 |
12.00 |
| 2026-06-13 00:00 |
14:28:48.04 |
-27:43:52.6 |
HIP 70788 |
11.69 |
| 2026-06-13 12:00 |
14:28:23.31 |
-27:41:01.7 |
HIP 70788 |
14.36 |
| 2026-06-14 00:00 |
14:27:58.85 |
-27:38:10.9 |
HIP 70788 |
18.73 |
| 2026-06-14 12:00 |
14:27:34.65 |
-27:35:20.4 |
HIP 70774 |
20.80 |
| 2026-06-15 00:00 |
14:27:10.72 |
-27:32:30.1 |
HIP 70774 |
22.42 |
| 2026-06-15 12:00 |
14:26:47.06 |
-27:29:40.2 |
HIP 70774 |
25.36 |
| 2026-06-16 00:00 |
14:26:23.66 |
-27:26:50.5 |
HIP 70774 |
29.18 |
| 2026-06-16 12:00 |
14:26:00.54 |
-27:24:01.3 |
HIP 70538 |
33.02 |
| 2026-06-17 00:00 |
14:25:37.69 |
-27:21:12.3 |
HIP 70538 |
30.16 |
| 2026-06-17 12:00 |
14:25:15.12 |
-27:18:23.8 |
HIP 70538 |
28.22 |
| 2026-06-18 00:00 |
14:24:52.82 |
-27:15:35.8 |
HIP 70538 |
27.36 |
| 2026-06-18 12:00 |
14:24:30.80 |
-27:12:48.2 |
HIP 70315 |
25.41 |
| 2026-06-19 00:00 |
14:24:09.06 |
-27:10:01.1 |
HIP 70315 |
20.08 |
| 2026-06-19 12:00 |
14:23:47.60 |
-27:07:14.5 |
HIP 70315 |
14.99 |
| 2026-06-20 00:00 |
14:23:26.42 |
-27:04:28.4 |
HIP 70315 |
10.37 |
| 2026-06-20 12:00 |
14:23:05.53 |
-27:01:42.9 |
HIP 70315 |
7.09 |
| 2026-06-21 00:00 |
14:22:44.91 |
-26:58:58.0 |
HIP 70315 |
7.13 |
| 2026-06-21 12:00 |
14:22:24.59 |
-26:56:13.7 |
HIP 70205 |
9.27 |
| 2026-06-22 00:00 |
14:22:04.54 |
-26:53:30.1 |
HIP 70205 |
8.51 |