| 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) |
| 2026-09-20 00:00 |
06:35:12.76 |
-87:02:30.8 |
HIP 32500 |
9.19 |
| 2026-09-20 12:00 |
06:35:17.86 |
-87:02:52.2 |
HIP 32500 |
9.16 |
| 2026-09-21 00:00 |
06:35:22.72 |
-87:03:13.6 |
HIP 32500 |
9.15 |
| 2026-09-21 12:00 |
06:35:27.35 |
-87:03:35.1 |
HIP 32500 |
9.16 |
| 2026-09-22 00:00 |
06:35:31.75 |
-87:03:56.6 |
HIP 32500 |
9.18 |
| 2026-09-22 12:00 |
06:35:35.91 |
-87:04:18.1 |
HIP 32500 |
9.22 |
| 2026-09-23 00:00 |
06:35:39.84 |
-87:04:39.7 |
HIP 32500 |
9.28 |
| 2026-09-23 12:00 |
06:35:43.53 |
-87:05:01.3 |
HIP 32500 |
9.36 |
| 2026-09-24 00:00 |
06:35:46.98 |
-87:05:22.9 |
HIP 32500 |
9.45 |
| 2026-09-24 12:00 |
06:35:50.19 |
-87:05:44.5 |
HIP 32500 |
9.56 |
| 2026-09-25 00:00 |
06:35:53.15 |
-87:06:06.2 |
HIP 32500 |
9.69 |
| 2026-09-25 12:00 |
06:35:55.87 |
-87:06:27.9 |
HIP 32500 |
9.82 |
| 2026-09-26 00:00 |
06:35:58.34 |
-87:06:49.6 |
HIP 32500 |
9.98 |
| 2026-09-26 12:00 |
06:36:00.56 |
-87:07:11.3 |
HIP 32500 |
10.15 |
| 2026-09-27 00:00 |
06:36:02.54 |
-87:07:33.1 |
HIP 32500 |
10.33 |
| 2026-09-27 12:00 |
06:36:04.26 |
-87:07:54.8 |
HIP 32500 |
10.52 |
| 2026-09-28 00:00 |
06:36:05.72 |
-87:08:16.6 |
HIP 32500 |
10.72 |
| 2026-09-28 12:00 |
06:36:06.94 |
-87:08:38.4 |
HIP 32500 |
10.94 |
| 2026-09-29 00:00 |
06:36:07.89 |
-87:09:00.2 |
HIP 32500 |
11.16 |
| 2026-09-29 12:00 |
06:36:08.58 |
-87:09:22.1 |
HIP 32500 |
11.40 |
| 2026-09-30 00:00 |
06:36:09.02 |
-87:09:43.9 |
HIP 32500 |
11.64 |
| 2026-09-30 12:00 |
06:36:09.19 |
-87:10:05.7 |
HIP 32500 |
11.89 |
| 2026-10-01 00:00 |
06:36:09.09 |
-87:10:27.6 |
HIP 32500 |
12.15 |
| 2026-10-01 12:00 |
06:36:08.73 |
-87:10:49.4 |
HIP 32500 |
12.42 |
| 2026-10-02 00:00 |
06:36:08.10 |
-87:11:11.3 |
HIP 32500 |
12.70 |
| 2026-10-02 12:00 |
06:36:07.20 |
-87:11:33.1 |
HIP 32500 |
12.98 |
| 2026-10-03 00:00 |
06:36:06.03 |
-87:11:55.0 |
HIP 32500 |
13.27 |
| 2026-10-03 12:00 |
06:36:04.58 |
-87:12:16.8 |
HIP 32500 |
13.56 |
| 2026-10-04 00:00 |
06:36:02.85 |
-87:12:38.7 |
HIP 32500 |
13.86 |
| 2026-10-04 12:00 |
06:36:00.85 |
-87:13:00.5 |
HIP 32500 |
14.16 |
| 2026-10-05 00:00 |
06:35:58.57 |
-87:13:22.4 |
HIP 32500 |
14.47 |
| 2026-10-05 12:00 |
06:35:56.00 |
-87:13:44.2 |
HIP 32500 |
14.79 |
| 2026-10-06 00:00 |
06:35:53.15 |
-87:14:06.0 |
HIP 32500 |
15.10 |
| 2026-10-06 12:00 |
06:35:50.01 |
-87:14:27.8 |
HIP 32500 |
15.42 |
| 2026-10-07 00:00 |
06:35:46.58 |
-87:14:49.6 |
HIP 32500 |
15.75 |
| 2026-10-07 12:00 |
06:35:42.87 |
-87:15:11.4 |
HIP 32500 |
16.08 |
| 2026-10-08 00:00 |
06:35:38.86 |
-87:15:33.2 |
HIP 32500 |
16.41 |
| 2026-10-08 12:00 |
06:35:34.55 |
-87:15:55.0 |
HIP 33601 |
16.71 |
| 2026-10-09 00:00 |
06:35:29.96 |
-87:16:16.7 |
HIP 33601 |
16.70 |
| 2026-10-09 12:00 |
06:35:25.06 |
-87:16:38.4 |
HIP 33601 |
16.70 |
| 2026-10-10 00:00 |
06:35:19.87 |
-87:17:00.1 |
HIP 33601 |
16.71 |
| 2026-10-10 12:00 |
06:35:14.37 |
-87:17:21.7 |
HIP 33601 |
16.73 |
| 2026-10-11 00:00 |
06:35:08.58 |
-87:17:43.4 |
HIP 33601 |
16.77 |