| Parameter |
Value |
| Designation |
75D/Kohoutek |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1994-06-29T21:33:48.680640Z |
| Orbit solution date (soln_date, UTC) |
2000-09-07T10:28:10Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-06-17.0000000 |
| e |
0.49630740 |
| q (au) |
1.784657 |
| a (au) |
3.543147 |
| i (deg) |
5.907209 |
| Ω (om, deg) |
269.686095 |
| ω (w, deg) |
175.801725 |
| M (ma, deg) |
358.093842 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
21:52:38.62 |
-08:07:13.3 |
HIP 107959 |
11.75 |
| 2026-06-01 12:00 |
21:52:44.99 |
-08:05:47.8 |
HIP 107959 |
13.70 |
| 2026-06-02 00:00 |
21:52:51.15 |
-08:04:23.2 |
HIP 107959 |
15.65 |
| 2026-06-02 12:00 |
21:52:57.09 |
-08:02:59.6 |
HIP 107959 |
17.59 |
| 2026-06-03 00:00 |
21:53:02.82 |
-08:01:37.0 |
HIP 107959 |
19.51 |
| 2026-06-03 12:00 |
21:53:08.32 |
-08:00:15.3 |
HIP 107959 |
21.39 |
| 2026-06-04 00:00 |
21:53:13.61 |
-07:58:54.6 |
HIP 107959 |
23.24 |
| 2026-06-04 12:00 |
21:53:18.68 |
-07:57:34.9 |
HIP 107959 |
25.05 |
| 2026-06-05 00:00 |
21:53:23.53 |
-07:56:16.2 |
HIP 107959 |
26.81 |
| 2026-06-05 12:00 |
21:53:28.16 |
-07:54:58.5 |
HIP 107959 |
28.53 |
| 2026-06-06 00:00 |
21:53:32.56 |
-07:53:41.8 |
HIP 108138 |
27.33 |
| 2026-06-06 12:00 |
21:53:36.74 |
-07:52:26.1 |
HIP 108138 |
25.71 |
| 2026-06-07 00:00 |
21:53:40.69 |
-07:51:11.5 |
HIP 108138 |
24.14 |
| 2026-06-07 12:00 |
21:53:44.42 |
-07:49:58.0 |
HIP 108138 |
22.61 |
| 2026-06-08 00:00 |
21:53:47.92 |
-07:48:45.4 |
HIP 108138 |
21.13 |
| 2026-06-08 12:00 |
21:53:51.19 |
-07:47:34.0 |
HIP 108138 |
19.69 |
| 2026-06-09 00:00 |
21:53:54.22 |
-07:46:23.6 |
HIP 108138 |
18.30 |
| 2026-06-09 12:00 |
21:53:57.03 |
-07:45:14.3 |
HIP 108138 |
16.95 |
| 2026-06-10 00:00 |
21:53:59.61 |
-07:44:06.1 |
HIP 108138 |
15.65 |
| 2026-06-10 12:00 |
21:54:01.95 |
-07:42:59.0 |
HIP 108138 |
14.39 |
| 2026-06-11 00:00 |
21:54:04.05 |
-07:41:53.1 |
HIP 108138 |
13.18 |
| 2026-06-11 12:00 |
21:54:05.92 |
-07:40:48.2 |
HIP 108138 |
12.01 |
| 2026-06-12 00:00 |
21:54:07.56 |
-07:39:44.5 |
HIP 108138 |
10.90 |
| 2026-06-12 12:00 |
21:54:08.95 |
-07:38:41.9 |
HIP 108138 |
9.84 |
| 2026-06-13 00:00 |
21:54:10.11 |
-07:37:40.4 |
HIP 108138 |
8.85 |
| 2026-06-13 12:00 |
21:54:11.03 |
-07:36:40.2 |
HIP 108138 |
7.92 |
| 2026-06-14 00:00 |
21:54:11.70 |
-07:35:41.0 |
HIP 108138 |
7.08 |
| 2026-06-14 12:00 |
21:54:12.14 |
-07:34:43.1 |
HIP 108138 |
6.34 |
| 2026-06-15 00:00 |
21:54:12.33 |
-07:33:46.3 |
HIP 108138 |
5.74 |
| 2026-06-15 12:00 |
21:54:12.28 |
-07:32:50.8 |
HIP 108138 |
5.30 |
| 2026-06-16 00:00 |
21:54:11.99 |
-07:31:56.4 |
HIP 108138 |
5.06 |
| 2026-06-16 12:00 |
21:54:11.45 |
-07:31:03.2 |
HIP 108138 |
5.04 |
| 2026-06-17 00:00 |
21:54:10.67 |
-07:30:11.3 |
HIP 108138 |
5.23 |
| 2026-06-17 12:00 |
21:54:09.64 |
-07:29:20.5 |
HIP 108138 |
5.62 |
| 2026-06-18 00:00 |
21:54:08.36 |
-07:28:31.0 |
HIP 108138 |
6.16 |
| 2026-06-18 12:00 |
21:54:06.84 |
-07:27:42.7 |
HIP 108138 |
6.81 |
| 2026-06-19 00:00 |
21:54:05.08 |
-07:26:55.7 |
HIP 108138 |
7.56 |
| 2026-06-19 12:00 |
21:54:03.06 |
-07:26:09.9 |
HIP 108138 |
8.38 |
| 2026-06-20 00:00 |
21:54:00.80 |
-07:25:25.3 |
HIP 108138 |
9.26 |
| 2026-06-20 12:00 |
21:53:58.29 |
-07:24:42.0 |
HIP 108138 |
10.18 |
| 2026-06-21 00:00 |
21:53:55.54 |
-07:24:00.0 |
HIP 108138 |
11.15 |
| 2026-06-21 12:00 |
21:53:52.53 |
-07:23:19.2 |
HIP 108138 |
12.15 |
| 2026-06-22 00:00 |
21:53:49.27 |
-07:22:39.7 |
HIP 108138 |
13.19 |