| 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) |
| 2026-05-12 00:00 |
04:48:59.04 |
+38:06:31.8 |
HIP 22423 |
14.21 |
| 2026-05-12 12:00 |
04:50:08.29 |
+38:06:50.9 |
HIP 22423 |
14.09 |
| 2026-05-13 00:00 |
04:51:17.72 |
+38:07:08.7 |
HIP 22529 |
22.06 |
| 2026-05-13 12:00 |
04:52:27.35 |
+38:07:25.2 |
HIP 22670 |
22.96 |
| 2026-05-14 00:00 |
04:53:37.16 |
+38:07:40.4 |
HIP 22670 |
25.74 |
| 2026-05-14 12:00 |
04:54:47.16 |
+38:07:54.3 |
HIP 23013 |
30.47 |
| 2026-05-15 00:00 |
04:55:57.35 |
+38:08:06.7 |
HIP 23013 |
20.20 |
| 2026-05-15 12:00 |
04:57:07.73 |
+38:08:17.8 |
HIP 23013 |
16.43 |
| 2026-05-16 00:00 |
04:58:18.29 |
+38:08:27.5 |
HIP 23179 |
18.77 |
| 2026-05-16 12:00 |
04:59:29.03 |
+38:08:35.7 |
HIP 23179 |
15.40 |
| 2026-05-17 00:00 |
05:00:39.96 |
+38:08:42.5 |
HIP 23323 |
16.70 |
| 2026-05-17 12:00 |
05:01:51.07 |
+38:08:47.9 |
HIP 23407 |
11.29 |
| 2026-05-18 00:00 |
05:03:02.37 |
+38:08:51.7 |
HIP 23407 |
18.29 |
| 2026-05-18 12:00 |
05:04:13.84 |
+38:08:54.1 |
HIP 23407 |
30.59 |
| 2026-05-19 00:00 |
05:05:25.49 |
+38:08:54.9 |
HIP 23774 |
26.17 |
| 2026-05-19 12:00 |
05:06:37.32 |
+38:08:54.2 |
HIP 23774 |
22.44 |
| 2026-05-20 00:00 |
05:07:49.33 |
+38:08:51.9 |
HIP 23774 |
26.86 |
| 2026-05-20 12:00 |
05:09:01.51 |
+38:08:48.0 |
HIP 24043 |
18.25 |
| 2026-05-21 00:00 |
05:10:13.87 |
+38:08:42.6 |
HIP 24043 |
13.86 |
| 2026-05-21 12:00 |
05:11:26.39 |
+38:08:35.5 |
HIP 24043 |
21.37 |
| 2026-05-22 00:00 |
05:12:39.10 |
+38:08:26.7 |
HIP 24352 |
10.63 |
| 2026-05-22 12:00 |
05:13:51.97 |
+38:08:16.3 |
HIP 24352 |
4.22 |
| 2026-05-23 00:00 |
05:15:05.01 |
+38:08:04.3 |
HIP 24437 |
8.29 |
| 2026-05-23 12:00 |
05:16:18.22 |
+38:07:50.5 |
HIP 24437 |
21.39 |
| 2026-05-24 00:00 |
05:17:31.60 |
+38:07:35.0 |
HIP 24837 |
23.41 |
| 2026-05-24 12:00 |
05:18:45.15 |
+38:07:17.7 |
HIP 24837 |
9.01 |
| 2026-05-25 00:00 |
05:19:58.86 |
+38:06:58.7 |
HIP 24837 |
5.79 |
| 2026-05-25 12:00 |
05:21:12.73 |
+38:06:37.9 |
HIP 24885 |
18.06 |
| 2026-05-26 00:00 |
05:22:26.77 |
+38:06:15.3 |
HIP 25114 |
25.75 |
| 2026-05-26 12:00 |
05:23:40.97 |
+38:05:50.9 |
HIP 25370 |
23.35 |
| 2026-05-27 00:00 |
05:24:55.34 |
+38:05:24.7 |
HIP 25370 |
8.92 |
| 2026-05-27 12:00 |
05:26:09.86 |
+38:04:56.6 |
HIP 25370 |
6.57 |
| 2026-05-28 00:00 |
05:27:24.55 |
+38:04:26.6 |
HIP 25370 |
20.95 |
| 2026-05-28 12:00 |
05:28:39.39 |
+38:03:54.8 |
HIP 25771 |
23.38 |
| 2026-05-29 00:00 |
05:29:54.39 |
+38:03:21.0 |
HIP 25771 |
15.70 |
| 2026-05-29 12:00 |
05:31:09.55 |
+38:02:45.3 |
HIP 25942 |
12.16 |
| 2026-05-30 00:00 |
05:32:24.86 |
+38:02:07.6 |
HIP 25942 |
3.91 |
| 2026-05-30 12:00 |
05:33:40.33 |
+38:01:28.0 |
HIP 25942 |
18.01 |
| 2026-05-31 00:00 |
05:34:55.96 |
+38:00:46.3 |
HIP 26261 |
7.49 |
| 2026-05-31 12:00 |
05:36:11.73 |
+38:00:02.7 |
HIP 26261 |
7.54 |
| 2026-06-01 00:00 |
05:37:27.66 |
+37:59:17.1 |
HIP 26360 |
12.86 |
| 2026-06-01 12:00 |
05:38:43.74 |
+37:58:29.4 |
HIP 26585 |
4.05 |
| 2026-06-02 00:00 |
05:39:59.96 |
+37:57:39.6 |
HIP 26632 |
4.86 |