275P/Hermann
| Parameter |
Value |
| Designation |
275P/Hermann |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1999-02-19T23:33:43.277760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:12Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-03-27.0000000 |
| e |
0.71393870 |
| q (au) |
1.649060 |
| a (au) |
5.764709 |
| i (deg) |
21.570958 |
| Ω (om, deg) |
349.270066 |
| ω (w, deg) |
173.139081 |
| M (ma, deg) |
132.593422 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.086 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.086 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
02:15:05.52 |
+36:40:31.4 |
HIP 10501 |
10.67 |
| 2026-02-03 12:00 |
02:15:26.37 |
+36:39:22.3 |
HIP 10554 |
8.87 |
| 2026-02-04 00:00 |
02:15:47.55 |
+36:38:14.8 |
HIP 10554 |
8.11 |
| 2026-02-04 12:00 |
02:16:09.07 |
+36:37:09.1 |
HIP 10554 |
9.56 |
| 2026-02-05 00:00 |
02:16:30.92 |
+36:36:05.1 |
HIP 10554 |
12.53 |
| 2026-02-05 12:00 |
02:16:53.11 |
+36:35:02.8 |
HIP 10693 |
14.58 |
| 2026-02-06 00:00 |
02:17:15.62 |
+36:34:02.2 |
HIP 10693 |
11.25 |
| 2026-02-06 12:00 |
02:17:38.47 |
+36:33:03.3 |
HIP 10693 |
9.15 |
| 2026-02-07 00:00 |
02:18:01.64 |
+36:32:06.1 |
HIP 10693 |
9.29 |
| 2026-02-07 12:00 |
02:18:25.14 |
+36:31:10.5 |
HIP 10693 |
11.64 |
| 2026-02-08 00:00 |
02:18:48.97 |
+36:30:16.7 |
HIP 10693 |
15.28 |
| 2026-02-08 12:00 |
02:19:13.12 |
+36:29:24.6 |
HIP 10693 |
19.53 |
| 2026-02-09 00:00 |
02:19:37.59 |
+36:28:34.1 |
HIP 10693 |
24.12 |
| 2026-02-09 12:00 |
02:20:02.39 |
+36:27:45.3 |
HIP 10693 |
28.91 |
| 2026-02-10 00:00 |
02:20:27.51 |
+36:26:58.2 |
HIP 11069 |
25.10 |
| 2026-02-10 12:00 |
02:20:52.94 |
+36:26:12.7 |
HIP 11069 |
19.94 |
| 2026-02-11 00:00 |
02:21:18.70 |
+36:25:28.9 |
HIP 11069 |
14.73 |
| 2026-02-11 12:00 |
02:21:44.77 |
+36:24:46.7 |
HIP 11069 |
9.48 |
| 2026-02-12 00:00 |
02:22:11.16 |
+36:24:06.2 |
HIP 11069 |
4.31 |
| 2026-02-12 12:00 |
02:22:37.86 |
+36:23:27.3 |
HIP 11069 |
2.20 |
| 2026-02-13 00:00 |
02:23:04.87 |
+36:22:50.1 |
HIP 11069 |
7.12 |
| 2026-02-13 12:00 |
02:23:32.20 |
+36:22:14.5 |
HIP 11069 |
12.57 |
| 2026-02-14 00:00 |
02:23:59.83 |
+36:21:40.5 |
HIP 11069 |
18.13 |
| 2026-02-14 12:00 |
02:24:27.78 |
+36:21:08.1 |
HIP 11069 |
23.77 |
| 2026-02-15 00:00 |
02:24:56.03 |
+36:20:37.3 |
HIP 11069 |
29.48 |
| 2026-02-15 12:00 |
02:25:24.59 |
+36:20:08.1 |
HIP 11430 |
24.66 |
| 2026-02-16 00:00 |
02:25:53.46 |
+36:19:40.5 |
HIP 11430 |
18.88 |
| 2026-02-16 12:00 |
02:26:22.63 |
+36:19:14.5 |
HIP 11430 |
13.08 |
| 2026-02-17 00:00 |
02:26:52.11 |
+36:18:50.0 |
HIP 11430 |
7.35 |
| 2026-02-17 12:00 |
02:27:21.88 |
+36:18:27.1 |
HIP 11430 |
2.75 |
| 2026-02-18 00:00 |
02:27:51.96 |
+36:18:05.8 |
HIP 11430 |
5.81 |
| 2026-02-18 12:00 |
02:28:22.33 |
+36:17:46.0 |
HIP 11430 |
11.61 |
| 2026-02-19 00:00 |
02:28:53.00 |
+36:17:27.7 |
HIP 11430 |
17.68 |
| 2026-02-19 12:00 |
02:29:23.97 |
+36:17:11.0 |
HIP 11690 |
19.64 |
| 2026-02-20 00:00 |
02:29:55.23 |
+36:16:55.8 |
HIP 11690 |
14.43 |
| 2026-02-20 12:00 |
02:30:26.79 |
+36:16:42.0 |
HIP 11690 |
10.52 |
| 2026-02-21 00:00 |
02:30:58.64 |
+36:16:29.8 |
HIP 11690 |
9.73 |
| 2026-02-21 12:00 |
02:31:30.78 |
+36:16:19.0 |
HIP 11784 |
10.34 |
| 2026-02-22 00:00 |
02:32:03.20 |
+36:16:09.7 |
HIP 11784 |
7.35 |
| 2026-02-22 12:00 |
02:32:35.92 |
+36:16:01.9 |
HIP 11784 |
9.38 |
| 2026-02-23 00:00 |
02:33:08.92 |
+36:15:55.4 |
HIP 11784 |
14.52 |
| 2026-02-23 12:00 |
02:33:42.21 |
+36:15:50.5 |
HIP 11784 |
20.61 |
| 2026-02-24 00:00 |
02:34:15.78 |
+36:15:46.9 |
HIP 11784 |
27.06 |