| 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) |
| 2026-09-20 00:00 |
14:30:51.39 |
-24:07:02.0 |
HIP 71045 |
29.38 |
| 2026-09-20 12:00 |
14:31:11.72 |
-24:07:51.7 |
HIP 71045 |
26.91 |
| 2026-09-21 00:00 |
14:31:32.18 |
-24:08:42.2 |
HIP 71152 |
23.47 |
| 2026-09-21 12:00 |
14:31:52.76 |
-24:09:33.5 |
HIP 71152 |
19.44 |
| 2026-09-22 00:00 |
14:32:13.48 |
-24:10:25.6 |
HIP 71152 |
15.82 |
| 2026-09-22 12:00 |
14:32:34.32 |
-24:11:18.6 |
HIP 71152 |
12.98 |
| 2026-09-23 00:00 |
14:32:55.28 |
-24:12:12.3 |
HIP 71152 |
11.57 |
| 2026-09-23 12:00 |
14:33:16.37 |
-24:13:06.8 |
HIP 71212 |
10.42 |
| 2026-09-24 00:00 |
14:33:37.59 |
-24:14:02.1 |
HIP 71212 |
7.10 |
| 2026-09-24 12:00 |
14:33:58.92 |
-24:14:58.2 |
HIP 71212 |
6.39 |
| 2026-09-25 00:00 |
14:34:20.38 |
-24:15:55.1 |
HIP 71212 |
8.98 |
| 2026-09-25 12:00 |
14:34:41.96 |
-24:16:52.7 |
HIP 71212 |
13.06 |
| 2026-09-26 00:00 |
14:35:03.67 |
-24:17:51.1 |
HIP 71212 |
17.65 |
| 2026-09-26 12:00 |
14:35:25.49 |
-24:18:50.3 |
HIP 71450 |
20.08 |
| 2026-09-27 00:00 |
14:35:47.43 |
-24:19:50.2 |
HIP 71450 |
15.30 |
| 2026-09-27 12:00 |
14:36:09.49 |
-24:20:50.8 |
HIP 71450 |
10.78 |
| 2026-09-28 00:00 |
14:36:31.67 |
-24:21:52.1 |
HIP 71450 |
7.11 |
| 2026-09-28 12:00 |
14:36:53.96 |
-24:22:54.2 |
HIP 71450 |
6.16 |
| 2026-09-29 00:00 |
14:37:16.38 |
-24:23:57.1 |
HIP 71450 |
8.91 |
| 2026-09-29 12:00 |
14:37:38.90 |
-24:25:00.6 |
HIP 71450 |
13.25 |
| 2026-09-30 00:00 |
14:38:01.55 |
-24:26:04.8 |
HIP 71450 |
18.09 |
| 2026-09-30 12:00 |
14:38:24.31 |
-24:27:09.8 |
HIP 71450 |
23.14 |
| 2026-10-01 00:00 |
14:38:47.18 |
-24:28:15.4 |
HIP 71702 |
27.94 |
| 2026-10-01 12:00 |
14:39:10.17 |
-24:29:21.8 |
HIP 71702 |
26.04 |
| 2026-10-02 00:00 |
14:39:33.27 |
-24:30:28.8 |
HIP 71702 |
25.17 |
| 2026-10-02 12:00 |
14:39:56.49 |
-24:31:36.5 |
HIP 71702 |
25.45 |
| 2026-10-03 00:00 |
14:40:19.82 |
-24:32:44.9 |
HIP 71702 |
26.85 |
| 2026-10-03 12:00 |
14:40:43.25 |
-24:33:54.0 |
HIP 71702 |
29.23 |
| 2026-10-04 00:00 |
14:41:06.80 |
-24:35:03.7 |
HIP 71943 |
24.59 |
| 2026-10-04 12:00 |
14:41:30.46 |
-24:36:14.1 |
HIP 71943 |
19.76 |
| 2026-10-05 00:00 |
14:41:54.23 |
-24:37:25.1 |
HIP 71943 |
15.36 |
| 2026-10-05 12:00 |
14:42:18.11 |
-24:38:36.8 |
HIP 71943 |
11.95 |
| 2026-10-06 00:00 |
14:42:42.10 |
-24:39:49.1 |
HIP 71943 |
10.56 |
| 2026-10-06 12:00 |
14:43:06.19 |
-24:41:02.1 |
HIP 71943 |
11.96 |
| 2026-10-07 00:00 |
14:43:30.39 |
-24:42:15.7 |
HIP 71943 |
15.44 |
| 2026-10-07 12:00 |
14:43:54.70 |
-24:43:29.9 |
HIP 71974 |
18.84 |
| 2026-10-08 00:00 |
14:44:19.11 |
-24:44:44.7 |
HIP 72078 |
18.70 |
| 2026-10-08 12:00 |
14:44:43.63 |
-24:46:00.2 |
HIP 72078 |
17.00 |
| 2026-10-09 00:00 |
14:45:08.25 |
-24:47:16.2 |
HIP 72078 |
17.12 |
| 2026-10-09 12:00 |
14:45:32.97 |
-24:48:32.9 |
HIP 72259 |
14.74 |
| 2026-10-10 00:00 |
14:45:57.80 |
-24:49:50.1 |
HIP 72259 |
10.11 |
| 2026-10-10 12:00 |
14:46:22.72 |
-24:51:07.9 |
HIP 72259 |
7.35 |
| 2026-10-11 00:00 |
14:46:47.75 |
-24:52:26.3 |
HIP 72259 |
8.57 |