| Parameter |
Value |
| Designation |
C/1981 M1 (Gonzalez) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-03-25T15:42:23.296320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1981-08-07.0000000 |
| e |
0.99935134 |
| q (au) |
2.333585 |
| a (au) |
3597.566450 |
| i (deg) |
107.144868 |
| Ω (om, deg) |
143.968785 |
| ω (w, deg) |
181.611922 |
| M (ma, deg) |
0.000614 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.178 + 2.822\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.178 |
| n |
2.822 |
| gf |
0.991 |
| gb |
-0.978 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
09:43:57.54 |
-05:43:11.0 |
HIP 47757 |
27.81 |
| 2026-09-20 12:00 |
09:43:58.86 |
-05:43:21.4 |
HIP 47757 |
27.61 |
| 2026-09-21 00:00 |
09:44:00.17 |
-05:43:31.8 |
HIP 47757 |
27.41 |
| 2026-09-21 12:00 |
09:44:01.48 |
-05:43:42.2 |
HIP 47757 |
27.21 |
| 2026-09-22 00:00 |
09:44:02.77 |
-05:43:52.7 |
HIP 47757 |
27.01 |
| 2026-09-22 12:00 |
09:44:04.06 |
-05:44:03.2 |
HIP 47757 |
26.82 |
| 2026-09-23 00:00 |
09:44:05.34 |
-05:44:13.7 |
HIP 47757 |
26.63 |
| 2026-09-23 12:00 |
09:44:06.62 |
-05:44:24.2 |
HIP 47757 |
26.45 |
| 2026-09-24 00:00 |
09:44:07.88 |
-05:44:34.8 |
HIP 47757 |
26.27 |
| 2026-09-24 12:00 |
09:44:09.14 |
-05:44:45.3 |
HIP 47757 |
26.09 |
| 2026-09-25 00:00 |
09:44:10.39 |
-05:44:55.9 |
HIP 47757 |
25.91 |
| 2026-09-25 12:00 |
09:44:11.63 |
-05:45:06.5 |
HIP 47757 |
25.74 |
| 2026-09-26 00:00 |
09:44:12.86 |
-05:45:17.1 |
HIP 47757 |
25.57 |
| 2026-09-26 12:00 |
09:44:14.08 |
-05:45:27.7 |
HIP 47757 |
25.41 |
| 2026-09-27 00:00 |
09:44:15.30 |
-05:45:38.3 |
HIP 47757 |
25.25 |
| 2026-09-27 12:00 |
09:44:16.51 |
-05:45:49.0 |
HIP 47757 |
25.09 |
| 2026-09-28 00:00 |
09:44:17.70 |
-05:45:59.6 |
HIP 47757 |
24.94 |
| 2026-09-28 12:00 |
09:44:18.89 |
-05:46:10.3 |
HIP 47757 |
24.79 |
| 2026-09-29 00:00 |
09:44:20.07 |
-05:46:21.0 |
HIP 47757 |
24.64 |
| 2026-09-29 12:00 |
09:44:21.25 |
-05:46:31.7 |
HIP 47757 |
24.49 |
| 2026-09-30 00:00 |
09:44:22.41 |
-05:46:42.4 |
HIP 47757 |
24.35 |
| 2026-09-30 12:00 |
09:44:23.56 |
-05:46:53.1 |
HIP 47757 |
24.22 |
| 2026-10-01 00:00 |
09:44:24.71 |
-05:47:03.8 |
HIP 47757 |
24.08 |
| 2026-10-01 12:00 |
09:44:25.84 |
-05:47:14.5 |
HIP 47757 |
23.96 |
| 2026-10-02 00:00 |
09:44:26.97 |
-05:47:25.3 |
HIP 47757 |
23.83 |
| 2026-10-02 12:00 |
09:44:28.08 |
-05:47:36.0 |
HIP 47757 |
23.71 |
| 2026-10-03 00:00 |
09:44:29.19 |
-05:47:46.7 |
HIP 47757 |
23.59 |
| 2026-10-03 12:00 |
09:44:30.28 |
-05:47:57.5 |
HIP 47757 |
23.47 |
| 2026-10-04 00:00 |
09:44:31.37 |
-05:48:08.2 |
HIP 47757 |
23.36 |
| 2026-10-04 12:00 |
09:44:32.45 |
-05:48:19.0 |
HIP 47757 |
23.25 |
| 2026-10-05 00:00 |
09:44:33.52 |
-05:48:29.7 |
HIP 47757 |
23.14 |
| 2026-10-05 12:00 |
09:44:34.57 |
-05:48:40.5 |
HIP 47757 |
23.04 |
| 2026-10-06 00:00 |
09:44:35.62 |
-05:48:51.2 |
HIP 47757 |
22.94 |
| 2026-10-06 12:00 |
09:44:36.66 |
-05:49:02.0 |
HIP 47757 |
22.84 |
| 2026-10-07 00:00 |
09:44:37.68 |
-05:49:12.7 |
HIP 47757 |
22.75 |
| 2026-10-07 12:00 |
09:44:38.70 |
-05:49:23.4 |
HIP 47757 |
22.66 |
| 2026-10-08 00:00 |
09:44:39.71 |
-05:49:34.2 |
HIP 47757 |
22.57 |
| 2026-10-08 12:00 |
09:44:40.70 |
-05:49:44.9 |
HIP 47757 |
22.49 |
| 2026-10-09 00:00 |
09:44:41.69 |
-05:49:55.6 |
HIP 47757 |
22.41 |
| 2026-10-09 12:00 |
09:44:42.66 |
-05:50:06.4 |
HIP 47757 |
22.33 |
| 2026-10-10 00:00 |
09:44:43.62 |
-05:50:17.1 |
HIP 47757 |
22.26 |
| 2026-10-10 12:00 |
09:44:44.57 |
-05:50:27.8 |
HIP 47757 |
22.18 |
| 2026-10-11 00:00 |
09:44:45.52 |
-05:50:38.5 |
HIP 47757 |
22.11 |