| Parameter |
Value |
| Designation |
175P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-22T15:01:37.251840Z |
| Orbit solution date (soln_date, UTC) |
2026-03-21T13:42:29Z |
| Obs used |
909 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
20.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-12-21.0000000 |
| e |
0.43270491 |
| q (au) |
1.951500 |
| a (au) |
3.440008 |
| i (deg) |
6.064671 |
| Ω (om, deg) |
123.807442 |
| ω (w, deg) |
55.364953 |
| M (ma, deg) |
279.883986 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.078 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.078 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-03-26 00:00 |
07:40:35.61 |
+24:02:25.0 |
HIP 37517 |
19.34 |
| 2026-03-26 12:00 |
07:40:52.30 |
+24:02:06.7 |
HIP 37517 |
15.54 |
| 2026-03-27 00:00 |
07:41:09.39 |
+24:01:47.1 |
HIP 37517 |
11.68 |
| 2026-03-27 12:00 |
07:41:26.88 |
+24:01:26.3 |
HIP 37517 |
7.79 |
| 2026-03-28 00:00 |
07:41:44.76 |
+24:01:04.2 |
HIP 37517 |
4.05 |
| 2026-03-28 12:00 |
07:42:03.03 |
+24:00:40.9 |
HIP 37517 |
2.43 |
| 2026-03-29 00:00 |
07:42:21.70 |
+24:00:16.3 |
HIP 37517 |
5.62 |
| 2026-03-29 12:00 |
07:42:40.75 |
+23:59:50.4 |
HIP 37517 |
9.78 |
| 2026-03-30 00:00 |
07:43:00.19 |
+23:59:23.4 |
HIP 37517 |
14.16 |
| 2026-03-30 12:00 |
07:43:20.01 |
+23:58:55.0 |
HIP 37650 |
12.04 |
| 2026-03-31 00:00 |
07:43:40.21 |
+23:58:25.4 |
HIP 37650 |
11.13 |
| 2026-03-31 12:00 |
07:44:00.79 |
+23:57:54.6 |
HIP 37650 |
12.09 |
| 2026-04-01 00:00 |
07:44:21.74 |
+23:57:22.5 |
HIP 37650 |
14.66 |
| 2026-04-01 12:00 |
07:44:43.06 |
+23:56:49.2 |
HIP 37650 |
18.23 |
| 2026-04-02 00:00 |
07:45:04.75 |
+23:56:14.6 |
HIP 37650 |
22.38 |
| 2026-04-02 12:00 |
07:45:26.81 |
+23:55:38.8 |
HIP 37788 |
24.60 |
| 2026-04-03 00:00 |
07:45:49.24 |
+23:55:01.7 |
HIP 37914 |
22.63 |
| 2026-04-03 12:00 |
07:46:12.02 |
+23:54:23.4 |
HIP 37988 |
19.54 |
| 2026-04-04 00:00 |
07:46:35.17 |
+23:53:43.8 |
HIP 37988 |
15.91 |
| 2026-04-04 12:00 |
07:46:58.68 |
+23:53:03.0 |
HIP 37988 |
13.43 |
| 2026-04-05 00:00 |
07:47:22.54 |
+23:52:20.9 |
HIP 37988 |
12.90 |
| 2026-04-05 12:00 |
07:47:46.75 |
+23:51:37.6 |
HIP 37988 |
14.62 |
| 2026-04-06 00:00 |
07:48:11.31 |
+23:50:52.9 |
HIP 37988 |
18.04 |
| 2026-04-06 12:00 |
07:48:36.22 |
+23:50:07.1 |
HIP 37988 |
22.46 |
| 2026-04-07 00:00 |
07:49:01.48 |
+23:49:19.9 |
HIP 37988 |
27.44 |
| 2026-04-07 12:00 |
07:49:27.08 |
+23:48:31.5 |
HIP 38287 |
26.88 |
| 2026-04-08 00:00 |
07:49:53.02 |
+23:47:41.9 |
HIP 38287 |
24.42 |
| 2026-04-08 12:00 |
07:50:19.30 |
+23:46:50.9 |
HIP 38287 |
23.29 |
| 2026-04-09 00:00 |
07:50:45.92 |
+23:45:58.7 |
HIP 38287 |
23.73 |
| 2026-04-09 12:00 |
07:51:12.87 |
+23:45:05.2 |
HIP 38287 |
25.71 |
| 2026-04-10 00:00 |
07:51:40.15 |
+23:44:10.5 |
HIP 38287 |
28.98 |
| 2026-04-10 12:00 |
07:52:07.77 |
+23:43:14.4 |
HIP 38603 |
31.76 |
| 2026-04-11 00:00 |
07:52:35.71 |
+23:42:17.1 |
HIP 38603 |
25.59 |
| 2026-04-11 12:00 |
07:53:03.97 |
+23:41:18.5 |
HIP 38603 |
19.54 |
| 2026-04-12 00:00 |
07:53:32.56 |
+23:40:18.6 |
HIP 38603 |
13.89 |
| 2026-04-12 12:00 |
07:54:01.47 |
+23:39:17.4 |
HIP 38603 |
9.52 |
| 2026-04-13 00:00 |
07:54:30.70 |
+23:38:14.9 |
HIP 38603 |
8.85 |
| 2026-04-13 12:00 |
07:55:00.24 |
+23:37:11.1 |
HIP 38603 |
12.62 |
| 2026-04-14 00:00 |
07:55:30.10 |
+23:36:06.0 |
HIP 38761 |
8.44 |
| 2026-04-14 12:00 |
07:56:00.27 |
+23:34:59.6 |
HIP 38761 |
2.82 |
| 2026-04-15 00:00 |
07:56:30.75 |
+23:33:51.9 |
HIP 38761 |
6.61 |
| 2026-04-15 12:00 |
07:57:01.53 |
+23:32:42.9 |
HIP 38761 |
13.47 |
| 2026-04-16 00:00 |
07:57:32.62 |
+23:31:32.6 |
HIP 38761 |
20.60 |