| Parameter |
Value |
| Designation |
C/1967 M1 (Mitchell-Jones-Gerber) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1967-06-16T18:50:32.415360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
39 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
13.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1967-07-23.0000000 |
| e |
1.00000000 |
| q (au) |
0.178250 |
| a (au) |
- |
| i (deg) |
56.708043 |
| Ω (om, deg) |
32.293259 |
| ω (w, deg) |
78.943837 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (7.456 + 4.284\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.456 |
| n |
4.284 |
| gf |
0.999 |
| gb |
-0.591 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
18:33:23.05 |
-76:48:18.4 |
HIP 90686 |
13.32 |
| 2026-09-20 12:00 |
18:33:22.06 |
-76:48:02.0 |
HIP 90686 |
13.12 |
| 2026-09-21 00:00 |
18:33:21.13 |
-76:47:45.6 |
HIP 90686 |
12.93 |
| 2026-09-21 12:00 |
18:33:20.25 |
-76:47:29.2 |
HIP 90686 |
12.74 |
| 2026-09-22 00:00 |
18:33:19.43 |
-76:47:12.8 |
HIP 90686 |
12.56 |
| 2026-09-22 12:00 |
18:33:18.65 |
-76:46:56.3 |
HIP 90686 |
12.39 |
| 2026-09-23 00:00 |
18:33:17.93 |
-76:46:39.8 |
HIP 90686 |
12.22 |
| 2026-09-23 12:00 |
18:33:17.26 |
-76:46:23.3 |
HIP 90686 |
12.05 |
| 2026-09-24 00:00 |
18:33:16.64 |
-76:46:06.8 |
HIP 90686 |
11.90 |
| 2026-09-24 12:00 |
18:33:16.07 |
-76:45:50.2 |
HIP 90686 |
11.75 |
| 2026-09-25 00:00 |
18:33:15.55 |
-76:45:33.6 |
HIP 90686 |
11.61 |
| 2026-09-25 12:00 |
18:33:15.09 |
-76:45:17.0 |
HIP 90686 |
11.47 |
| 2026-09-26 00:00 |
18:33:14.68 |
-76:45:00.4 |
HIP 90686 |
11.35 |
| 2026-09-26 12:00 |
18:33:14.32 |
-76:44:43.8 |
HIP 90686 |
11.23 |
| 2026-09-27 00:00 |
18:33:14.01 |
-76:44:27.2 |
HIP 90686 |
11.12 |
| 2026-09-27 12:00 |
18:33:13.75 |
-76:44:10.5 |
HIP 90686 |
11.02 |
| 2026-09-28 00:00 |
18:33:13.55 |
-76:43:53.8 |
HIP 90686 |
10.92 |
| 2026-09-28 12:00 |
18:33:13.39 |
-76:43:37.2 |
HIP 90686 |
10.84 |
| 2026-09-29 00:00 |
18:33:13.29 |
-76:43:20.5 |
HIP 90686 |
10.77 |
| 2026-09-29 12:00 |
18:33:13.24 |
-76:43:03.8 |
HIP 90686 |
10.70 |
| 2026-09-30 00:00 |
18:33:13.24 |
-76:42:47.1 |
HIP 90686 |
10.65 |
| 2026-09-30 12:00 |
18:33:13.29 |
-76:42:30.4 |
HIP 90686 |
10.60 |
| 2026-10-01 00:00 |
18:33:13.40 |
-76:42:13.6 |
HIP 90686 |
10.57 |
| 2026-10-01 12:00 |
18:33:13.55 |
-76:41:56.9 |
HIP 90686 |
10.54 |
| 2026-10-02 00:00 |
18:33:13.76 |
-76:41:40.2 |
HIP 90686 |
10.53 |
| 2026-10-02 12:00 |
18:33:14.02 |
-76:41:23.4 |
HIP 90686 |
10.53 |
| 2026-10-03 00:00 |
18:33:14.33 |
-76:41:06.7 |
HIP 90686 |
10.53 |
| 2026-10-03 12:00 |
18:33:14.69 |
-76:40:50.0 |
HIP 90686 |
10.55 |
| 2026-10-04 00:00 |
18:33:15.10 |
-76:40:33.3 |
HIP 90686 |
10.58 |
| 2026-10-04 12:00 |
18:33:15.57 |
-76:40:16.5 |
HIP 90686 |
10.62 |
| 2026-10-05 00:00 |
18:33:16.09 |
-76:39:59.8 |
HIP 90686 |
10.66 |
| 2026-10-05 12:00 |
18:33:16.65 |
-76:39:43.1 |
HIP 90686 |
10.72 |
| 2026-10-06 00:00 |
18:33:17.27 |
-76:39:26.4 |
HIP 90686 |
10.79 |
| 2026-10-06 12:00 |
18:33:17.94 |
-76:39:09.7 |
HIP 90686 |
10.87 |
| 2026-10-07 00:00 |
18:33:18.66 |
-76:38:53.0 |
HIP 90686 |
10.95 |
| 2026-10-07 12:00 |
18:33:19.44 |
-76:38:36.3 |
HIP 90686 |
11.05 |
| 2026-10-08 00:00 |
18:33:20.26 |
-76:38:19.6 |
HIP 90686 |
11.16 |
| 2026-10-08 12:00 |
18:33:21.13 |
-76:38:02.9 |
HIP 90686 |
11.27 |
| 2026-10-09 00:00 |
18:33:22.06 |
-76:37:46.3 |
HIP 90686 |
11.39 |
| 2026-10-09 12:00 |
18:33:23.03 |
-76:37:29.7 |
HIP 90686 |
11.53 |
| 2026-10-10 00:00 |
18:33:24.06 |
-76:37:13.1 |
HIP 90686 |
11.67 |
| 2026-10-10 12:00 |
18:33:25.14 |
-76:36:56.5 |
HIP 90686 |
11.81 |
| 2026-10-11 00:00 |
18:33:26.27 |
-76:36:39.9 |
HIP 90686 |
11.97 |