C/1975 N1 (Kobayashi-Berger-Milon)
| Parameter |
Value |
| Designation |
C/1975 N1 (Kobayashi-Berger-Milon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-09-05T08:02:10.029120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
390 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
11.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1975-08-09.0000000 |
| e |
1.00009176 |
| q (au) |
0.425564 |
| a (au) |
-4637.833606 |
| i (deg) |
80.781301 |
| Ω (om, deg) |
296.352017 |
| ω (w, deg) |
116.969468 |
| M (ma, deg) |
-0.000085 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.113 + 3.526\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.113 |
| n |
3.526 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.975 |
| δ90 |
8.837 |
| 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 |
04:47:35.52 |
-87:27:31.9 |
HIP 20325 |
26.75 |
| 2026-02-03 12:00 |
04:47:17.92 |
-87:27:12.3 |
HIP 20325 |
26.91 |
| 2026-02-04 00:00 |
04:47:00.66 |
-87:26:52.7 |
HIP 20325 |
27.08 |
| 2026-02-04 12:00 |
04:46:43.73 |
-87:26:33.0 |
HIP 20325 |
27.25 |
| 2026-02-05 00:00 |
04:46:27.15 |
-87:26:13.2 |
HIP 20325 |
27.44 |
| 2026-02-05 12:00 |
04:46:10.91 |
-87:25:53.3 |
HIP 20325 |
27.62 |
| 2026-02-06 00:00 |
04:45:55.00 |
-87:25:33.3 |
HIP 20325 |
27.82 |
| 2026-02-06 12:00 |
04:45:39.43 |
-87:25:13.2 |
HIP 20325 |
28.02 |
| 2026-02-07 00:00 |
04:45:24.20 |
-87:24:53.0 |
HIP 20325 |
28.23 |
| 2026-02-07 12:00 |
04:45:09.31 |
-87:24:32.7 |
HIP 20325 |
28.44 |
| 2026-02-08 00:00 |
04:44:54.75 |
-87:24:12.4 |
HIP 20325 |
28.66 |
| 2026-02-08 12:00 |
04:44:40.52 |
-87:23:51.9 |
HIP 20325 |
28.89 |
| 2026-02-09 00:00 |
04:44:26.63 |
-87:23:31.4 |
HIP 20325 |
29.12 |
| 2026-02-09 12:00 |
04:44:13.08 |
-87:23:10.8 |
HIP 20325 |
29.36 |
| 2026-02-10 00:00 |
04:43:59.85 |
-87:22:50.2 |
HIP 20325 |
29.60 |
| 2026-02-10 12:00 |
04:43:46.96 |
-87:22:29.4 |
HIP 20325 |
29.85 |
| 2026-02-11 00:00 |
04:43:34.40 |
-87:22:08.6 |
HIP 20325 |
30.10 |
| 2026-02-11 12:00 |
04:43:22.17 |
-87:21:47.7 |
HIP 20325 |
30.35 |
| 2026-02-12 00:00 |
04:43:10.27 |
-87:21:26.8 |
HIP 20325 |
30.62 |
| 2026-02-12 12:00 |
04:42:58.70 |
-87:21:05.8 |
HIP 20198 |
30.83 |
| 2026-02-13 00:00 |
04:42:47.46 |
-87:20:44.7 |
HIP 20198 |
30.48 |
| 2026-02-13 12:00 |
04:42:36.54 |
-87:20:23.6 |
HIP 20198 |
30.12 |
| 2026-02-14 00:00 |
04:42:25.95 |
-87:20:02.4 |
HIP 20198 |
29.76 |
| 2026-02-14 12:00 |
04:42:15.68 |
-87:19:41.2 |
HIP 20198 |
29.41 |
| 2026-02-15 00:00 |
04:42:05.74 |
-87:19:19.9 |
HIP 20198 |
29.06 |
| 2026-02-15 12:00 |
04:41:56.11 |
-87:18:58.6 |
HIP 20198 |
28.71 |
| 2026-02-16 00:00 |
04:41:46.81 |
-87:18:37.2 |
HIP 20198 |
28.36 |
| 2026-02-16 12:00 |
04:41:37.83 |
-87:18:15.7 |
HIP 20198 |
28.02 |
| 2026-02-17 00:00 |
04:41:29.16 |
-87:17:54.2 |
HIP 20198 |
27.68 |
| 2026-02-17 12:00 |
04:41:20.82 |
-87:17:32.7 |
HIP 20198 |
27.34 |
| 2026-02-18 00:00 |
04:41:12.78 |
-87:17:11.2 |
HIP 20198 |
27.00 |
| 2026-02-18 12:00 |
04:41:05.07 |
-87:16:49.6 |
HIP 20198 |
26.66 |
| 2026-02-19 00:00 |
04:40:57.66 |
-87:16:27.9 |
HIP 20198 |
26.33 |
| 2026-02-19 12:00 |
04:40:50.56 |
-87:16:06.2 |
HIP 20198 |
26.00 |
| 2026-02-20 00:00 |
04:40:43.78 |
-87:15:44.5 |
HIP 20198 |
25.68 |
| 2026-02-20 12:00 |
04:40:37.30 |
-87:15:22.8 |
HIP 20198 |
25.35 |
| 2026-02-21 00:00 |
04:40:31.13 |
-87:15:01.1 |
HIP 20198 |
25.03 |
| 2026-02-21 12:00 |
04:40:25.26 |
-87:14:39.3 |
HIP 20198 |
24.71 |
| 2026-02-22 00:00 |
04:40:19.70 |
-87:14:17.5 |
HIP 20198 |
24.40 |
| 2026-02-22 12:00 |
04:40:14.44 |
-87:13:55.6 |
HIP 20198 |
24.09 |
| 2026-02-23 00:00 |
04:40:09.47 |
-87:13:33.8 |
HIP 20198 |
23.79 |
| 2026-02-23 12:00 |
04:40:04.81 |
-87:13:11.9 |
HIP 20198 |
23.48 |
| 2026-02-24 00:00 |
04:40:00.44 |
-87:12:50.0 |
HIP 20198 |
23.19 |