168P/Hergenrother
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:54:00.75 |
-28:58:20.0 |
HIP 103221 |
27.91 |
| 2026-02-03 12:00 |
20:55:24.68 |
-28:50:27.8 |
HIP 103344 |
17.38 |
| 2026-02-04 00:00 |
20:56:48.60 |
-28:42:32.0 |
HIP 103344 |
23.07 |
| 2026-02-04 12:00 |
20:58:12.51 |
-28:34:32.8 |
HIP 103547 |
21.08 |
| 2026-02-05 00:00 |
20:59:36.41 |
-28:26:30.1 |
HIP 103547 |
16.66 |
| 2026-02-05 12:00 |
21:01:00.29 |
-28:18:23.9 |
HIP 103547 |
30.37 |
| 2026-02-06 00:00 |
21:02:24.16 |
-28:10:14.3 |
HIP 103759 |
24.78 |
| 2026-02-06 12:00 |
21:03:48.02 |
-28:02:01.1 |
HIP 104001 |
14.84 |
| 2026-02-07 00:00 |
21:05:11.86 |
-27:53:44.5 |
HIP 104001 |
13.69 |
| 2026-02-07 12:00 |
21:06:35.69 |
-27:45:24.4 |
HIP 104266 |
29.80 |
| 2026-02-08 00:00 |
21:07:59.50 |
-27:37:00.9 |
HIP 104266 |
21.16 |
| 2026-02-08 12:00 |
21:09:23.30 |
-27:28:33.8 |
HIP 104413 |
22.40 |
| 2026-02-09 00:00 |
21:10:47.08 |
-27:20:03.3 |
HIP 104585 |
12.23 |
| 2026-02-09 12:00 |
21:12:10.84 |
-27:11:29.3 |
HIP 104585 |
13.73 |
| 2026-02-10 00:00 |
21:13:34.58 |
-27:02:51.9 |
HIP 104722 |
23.15 |
| 2026-02-10 12:00 |
21:14:58.31 |
-26:54:10.9 |
HIP 104934 |
5.17 |
| 2026-02-11 00:00 |
21:16:22.01 |
-26:45:26.5 |
HIP 104934 |
17.47 |
| 2026-02-11 12:00 |
21:17:45.70 |
-26:36:38.7 |
HIP 105121 |
7.72 |
| 2026-02-12 00:00 |
21:19:09.36 |
-26:27:47.4 |
HIP 105312 |
10.57 |
| 2026-02-12 12:00 |
21:20:33.01 |
-26:18:52.6 |
HIP 105417 |
9.56 |
| 2026-02-13 00:00 |
21:21:56.63 |
-26:09:54.3 |
HIP 105417 |
17.81 |
| 2026-02-13 12:00 |
21:23:20.23 |
-26:00:52.6 |
HIP 105757 |
25.53 |
| 2026-02-14 00:00 |
21:24:43.81 |
-25:51:47.5 |
HIP 105757 |
15.75 |
| 2026-02-14 12:00 |
21:26:07.36 |
-25:42:38.9 |
HIP 105757 |
26.78 |
| 2026-02-15 00:00 |
21:27:30.89 |
-25:33:26.9 |
HIP 106034 |
16.68 |
| 2026-02-15 12:00 |
21:28:54.40 |
-25:24:11.4 |
HIP 106034 |
14.76 |
| 2026-02-16 00:00 |
21:30:17.89 |
-25:14:52.5 |
HIP 106185 |
3.76 |
| 2026-02-16 12:00 |
21:31:41.34 |
-25:05:30.2 |
HIP 106289 |
12.57 |
| 2026-02-17 00:00 |
21:33:04.78 |
-24:56:04.5 |
HIP 106520 |
19.31 |
| 2026-02-17 12:00 |
21:34:28.18 |
-24:46:35.3 |
HIP 106520 |
10.43 |
| 2026-02-18 00:00 |
21:35:51.56 |
-24:37:02.8 |
HIP 106759 |
25.34 |
| 2026-02-18 12:00 |
21:37:14.92 |
-24:27:26.8 |
HIP 106759 |
4.38 |
| 2026-02-19 00:00 |
21:38:38.24 |
-24:17:47.4 |
HIP 106887 |
10.22 |
| 2026-02-19 12:00 |
21:40:01.54 |
-24:08:04.7 |
HIP 107037 |
16.44 |
| 2026-02-20 00:00 |
21:41:24.81 |
-23:58:18.6 |
HIP 107037 |
10.69 |
| 2026-02-20 12:00 |
21:42:48.05 |
-23:48:29.1 |
HIP 107248 |
21.34 |
| 2026-02-21 00:00 |
21:44:11.26 |
-23:38:36.2 |
HIP 107248 |
32.03 |
| 2026-02-21 12:00 |
21:45:34.44 |
-23:28:40.0 |
HIP 107222 |
40.11 |
| 2026-02-22 00:00 |
21:46:57.60 |
-23:18:40.4 |
HIP 107691 |
33.25 |
| 2026-02-22 12:00 |
21:48:20.72 |
-23:08:37.5 |
HIP 107708 |
22.23 |
| 2026-02-23 00:00 |
21:49:43.82 |
-22:58:31.2 |
HIP 107708 |
12.66 |
| 2026-02-23 12:00 |
21:51:06.88 |
-22:48:21.6 |
HIP 107708 |
27.63 |
| 2026-02-24 00:00 |
21:52:29.91 |
-22:38:08.7 |
HIP 107877 |
40.96 |