| Parameter |
Value |
| Designation |
168P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-10-01T22:24:03.841920Z |
| Orbit solution date (soln_date, UTC) |
2025-11-21T13:43:00Z |
| Obs used |
3377 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
44.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-10-05.0000000 |
| e |
0.60947452 |
| q (au) |
1.415279 |
| a (au) |
3.624038 |
| i (deg) |
21.929366 |
| Ω (om, deg) |
356.477671 |
| ω (w, deg) |
13.919130 |
| M (ma, deg) |
308.150819 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.192 + 5.667\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.192 |
| n |
5.667 |
| gf |
0.916 |
| gb |
-0.533 |
| k |
0.990 |
| δ90 |
3.742 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:14:50.21 |
-10:50:40.5 |
HIP 114750 |
9.68 |
| 2026-03-26 12:00 |
23:16:12.17 |
-10:37:28.5 |
HIP 114858 |
15.98 |
| 2026-03-27 00:00 |
23:17:34.14 |
-10:24:14.2 |
HIP 114959 |
7.63 |
| 2026-03-27 12:00 |
23:18:56.10 |
-10:10:57.5 |
HIP 114959 |
29.76 |
| 2026-03-28 00:00 |
23:20:18.07 |
-09:57:38.6 |
HIP 115160 |
19.57 |
| 2026-03-28 12:00 |
23:21:40.05 |
-09:44:17.3 |
HIP 115347 |
3.01 |
| 2026-03-29 00:00 |
23:23:02.03 |
-09:30:53.9 |
HIP 115457 |
8.68 |
| 2026-03-29 12:00 |
23:24:24.02 |
-09:17:28.2 |
HIP 115457 |
17.35 |
| 2026-03-30 00:00 |
23:25:46.02 |
-09:04:00.3 |
HIP 115786 |
31.77 |
| 2026-03-30 12:00 |
23:27:08.03 |
-08:50:30.2 |
HIP 115875 |
28.42 |
| 2026-03-31 00:00 |
23:28:30.05 |
-08:36:58.0 |
HIP 115875 |
5.35 |
| 2026-03-31 12:00 |
23:29:52.09 |
-08:23:23.6 |
HIP 115875 |
20.95 |
| 2026-04-01 00:00 |
23:31:14.14 |
-08:09:47.2 |
HIP 116124 |
12.73 |
| 2026-04-01 12:00 |
23:32:36.20 |
-07:56:08.7 |
HIP 116124 |
26.60 |
| 2026-04-02 00:00 |
23:33:58.28 |
-07:42:28.2 |
HIP 116388 |
16.44 |
| 2026-04-02 12:00 |
23:35:20.38 |
-07:28:45.6 |
HIP 116428 |
3.03 |
| 2026-04-03 00:00 |
23:36:42.50 |
-07:15:01.1 |
HIP 116488 |
10.11 |
| 2026-04-03 12:00 |
23:38:04.64 |
-07:01:14.6 |
HIP 116488 |
27.20 |
| 2026-04-04 00:00 |
23:39:26.80 |
-06:47:26.1 |
HIP 116854 |
31.78 |
| 2026-04-04 12:00 |
23:40:48.99 |
-06:33:35.8 |
HIP 116854 |
7.19 |
| 2026-04-05 00:00 |
23:42:11.20 |
-06:19:43.6 |
HIP 116854 |
17.62 |
| 2026-04-05 12:00 |
23:43:33.43 |
-06:05:49.6 |
HIP 117056 |
11.40 |
| 2026-04-06 00:00 |
23:44:55.69 |
-05:51:53.7 |
HIP 117124 |
16.41 |
| 2026-04-06 12:00 |
23:46:17.99 |
-05:37:56.1 |
HIP 117267 |
11.94 |
| 2026-04-07 00:00 |
23:47:40.31 |
-05:23:56.7 |
HIP 117364 |
9.69 |
| 2026-04-07 12:00 |
23:49:02.66 |
-05:09:55.6 |
HIP 117364 |
18.45 |
| 2026-04-08 00:00 |
23:50:25.05 |
-04:55:52.9 |
HIP 117438 |
38.80 |
| 2026-04-08 12:00 |
23:51:47.47 |
-04:41:48.5 |
HIP 117780 |
43.21 |
| 2026-04-09 00:00 |
23:53:09.92 |
-04:27:42.5 |
HIP 117926 |
31.86 |
| 2026-04-09 12:00 |
23:54:32.41 |
-04:13:34.8 |
HIP 117926 |
27.93 |
| 2026-04-10 00:00 |
23:55:54.94 |
-03:59:25.7 |
HIP 118166 |
33.49 |
| 2026-04-10 12:00 |
23:57:17.51 |
-03:45:15.0 |
HIP 118166 |
18.67 |
| 2026-04-11 00:00 |
23:58:40.12 |
-03:31:02.9 |
HIP 118209 |
2.30 |
| 2026-04-11 12:00 |
00:00:02.77 |
-03:16:49.3 |
HIP 44 |
7.42 |
| 2026-04-12 00:00 |
00:01:25.46 |
-03:02:34.3 |
HIP 145 |
6.06 |
| 2026-04-12 12:00 |
00:02:48.20 |
-02:48:17.9 |
HIP 168 |
10.07 |
| 2026-04-13 00:00 |
00:04:10.98 |
-02:34:00.2 |
HIP 159 |
34.22 |
| 2026-04-13 12:00 |
00:05:33.81 |
-02:19:41.2 |
HIP 515 |
28.23 |
| 2026-04-14 00:00 |
00:06:56.69 |
-02:05:21.0 |
HIP 515 |
16.29 |
| 2026-04-14 12:00 |
00:08:19.61 |
-01:50:59.5 |
HIP 700 |
23.12 |
| 2026-04-15 00:00 |
00:09:42.59 |
-01:36:36.9 |
HIP 892 |
33.48 |
| 2026-04-15 12:00 |
00:11:05.62 |
-01:22:13.1 |
HIP 925 |
16.12 |
| 2026-04-16 00:00 |
00:12:28.70 |
-01:07:48.2 |
HIP 1018 |
6.51 |