| Parameter |
Value |
| Designation |
175P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-22T23:00:09.181440Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:31Z |
| Obs used |
924 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
20.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-02-26.0000000 |
| e |
0.43268420 |
| q (au) |
1.949246 |
| a (au) |
3.435910 |
| i (deg) |
6.069495 |
| Ω (om, deg) |
123.690044 |
| ω (w, deg) |
55.625115 |
| M (ma, deg) |
290.057709 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.033 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.033 |
| n |
6.000 |
| gf |
0.972 |
| gb |
-0.890 |
| k |
1.000 |
| δ90 |
9.437 |
| 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 |
09:01:40.28 |
+20:06:33.0 |
HIP 44477 |
29.20 |
| 2026-06-01 12:00 |
09:02:29.88 |
+20:03:14.6 |
HIP 44477 |
17.43 |
| 2026-06-02 00:00 |
09:03:19.60 |
+19:59:54.9 |
HIP 44477 |
6.93 |
| 2026-06-02 12:00 |
09:04:09.43 |
+19:56:33.7 |
HIP 44477 |
9.37 |
| 2026-06-03 00:00 |
09:04:59.37 |
+19:53:11.2 |
HIP 44477 |
20.63 |
| 2026-06-03 12:00 |
09:05:49.42 |
+19:49:47.3 |
HIP 44705 |
20.09 |
| 2026-06-04 00:00 |
09:06:39.58 |
+19:46:22.1 |
HIP 44705 |
20.86 |
| 2026-06-04 12:00 |
09:07:29.85 |
+19:42:55.5 |
HIP 44705 |
27.74 |
| 2026-06-05 00:00 |
09:08:20.22 |
+19:39:27.5 |
HIP 44964 |
23.22 |
| 2026-06-05 12:00 |
09:09:10.70 |
+19:35:58.1 |
HIP 44964 |
19.23 |
| 2026-06-06 00:00 |
09:10:01.28 |
+19:32:27.4 |
HIP 44964 |
22.54 |
| 2026-06-06 12:00 |
09:10:51.96 |
+19:28:55.3 |
HIP 45137 |
14.25 |
| 2026-06-07 00:00 |
09:11:42.75 |
+19:25:21.8 |
HIP 45137 |
8.86 |
| 2026-06-07 12:00 |
09:12:33.63 |
+19:21:46.9 |
HIP 45137 |
16.34 |
| 2026-06-08 00:00 |
09:13:24.61 |
+19:18:10.7 |
HIP 45137 |
27.76 |
| 2026-06-08 12:00 |
09:14:15.70 |
+19:14:33.1 |
HIP 45456 |
35.05 |
| 2026-06-09 00:00 |
09:15:06.87 |
+19:10:54.2 |
HIP 45456 |
25.46 |
| 2026-06-09 12:00 |
09:15:58.15 |
+19:07:13.9 |
HIP 45456 |
19.64 |
| 2026-06-10 00:00 |
09:16:49.52 |
+19:03:32.3 |
HIP 45510 |
15.83 |
| 2026-06-10 12:00 |
09:17:40.98 |
+18:59:49.2 |
HIP 45648 |
15.50 |
| 2026-06-11 00:00 |
09:18:32.54 |
+18:56:04.9 |
HIP 45648 |
9.93 |
| 2026-06-11 12:00 |
09:19:24.19 |
+18:52:19.1 |
HIP 45648 |
16.83 |
| 2026-06-12 00:00 |
09:20:15.93 |
+18:48:32.1 |
HIP 45826 |
17.69 |
| 2026-06-12 12:00 |
09:21:07.76 |
+18:44:43.6 |
HIP 45917 |
9.33 |
| 2026-06-13 00:00 |
09:21:59.67 |
+18:40:53.9 |
HIP 45917 |
4.90 |
| 2026-06-13 12:00 |
09:22:51.68 |
+18:37:02.7 |
HIP 45917 |
17.13 |
| 2026-06-14 00:00 |
09:23:43.77 |
+18:33:10.3 |
HIP 46100 |
22.64 |
| 2026-06-14 12:00 |
09:24:35.95 |
+18:29:16.5 |
HIP 46100 |
19.56 |
| 2026-06-15 00:00 |
09:25:28.21 |
+18:25:21.4 |
HIP 46137 |
21.62 |
| 2026-06-15 12:00 |
09:26:20.55 |
+18:21:24.9 |
HIP 46357 |
13.15 |
| 2026-06-16 00:00 |
09:27:12.98 |
+18:17:27.1 |
HIP 46357 |
3.91 |
| 2026-06-16 12:00 |
09:28:05.48 |
+18:13:28.0 |
HIP 46357 |
14.12 |
| 2026-06-17 00:00 |
09:28:58.07 |
+18:09:27.6 |
HIP 46357 |
26.97 |
| 2026-06-17 12:00 |
09:29:50.73 |
+18:05:25.9 |
HIP 46662 |
17.13 |
| 2026-06-18 00:00 |
09:30:43.47 |
+18:01:22.9 |
HIP 46662 |
13.89 |
| 2026-06-18 12:00 |
09:31:36.28 |
+17:57:18.5 |
HIP 46662 |
20.99 |
| 2026-06-19 00:00 |
09:32:29.17 |
+17:53:12.9 |
HIP 46900 |
27.58 |
| 2026-06-19 12:00 |
09:33:22.13 |
+17:49:06.0 |
HIP 46986 |
19.63 |
| 2026-06-20 00:00 |
09:34:15.16 |
+17:44:57.8 |
HIP 46986 |
14.00 |
| 2026-06-20 12:00 |
09:35:08.26 |
+17:40:48.4 |
HIP 46986 |
18.98 |
| 2026-06-21 00:00 |
09:36:01.43 |
+17:36:37.6 |
HIP 47138 |
23.25 |
| 2026-06-21 12:00 |
09:36:54.67 |
+17:32:25.6 |
HIP 47274 |
20.03 |
| 2026-06-22 00:00 |
09:37:47.98 |
+17:28:12.3 |
HIP 47274 |
7.93 |