| 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 |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
09:40:05.62 |
-05:55:37.9 |
HIP 47539 |
35.19 |
| 2026-03-26 12:00 |
09:40:04.39 |
-05:55:25.2 |
HIP 47539 |
35.55 |
| 2026-03-27 00:00 |
09:40:03.16 |
-05:55:12.5 |
HIP 47539 |
35.90 |
| 2026-03-27 12:00 |
09:40:01.95 |
-05:54:59.7 |
HIP 47539 |
36.26 |
| 2026-03-28 00:00 |
09:40:00.75 |
-05:54:47.0 |
HIP 47539 |
36.61 |
| 2026-03-28 12:00 |
09:39:59.55 |
-05:54:34.2 |
HIP 47539 |
36.96 |
| 2026-03-29 00:00 |
09:39:58.37 |
-05:54:21.4 |
HIP 47539 |
37.31 |
| 2026-03-29 12:00 |
09:39:57.19 |
-05:54:08.7 |
HIP 47539 |
37.66 |
| 2026-03-30 00:00 |
09:39:56.03 |
-05:53:55.9 |
HIP 47539 |
38.00 |
| 2026-03-30 12:00 |
09:39:54.88 |
-05:53:43.1 |
HIP 47539 |
38.35 |
| 2026-03-31 00:00 |
09:39:53.74 |
-05:53:30.4 |
HIP 47539 |
38.69 |
| 2026-03-31 12:00 |
09:39:52.61 |
-05:53:17.6 |
HIP 47539 |
39.03 |
| 2026-04-01 00:00 |
09:39:51.49 |
-05:53:04.9 |
HIP 47539 |
39.37 |
| 2026-04-01 12:00 |
09:39:50.38 |
-05:52:52.1 |
HIP 47539 |
39.71 |
| 2026-04-02 00:00 |
09:39:49.28 |
-05:52:39.3 |
HIP 47539 |
40.05 |
| 2026-04-02 12:00 |
09:39:48.19 |
-05:52:26.6 |
HIP 47539 |
40.39 |
| 2026-04-03 00:00 |
09:39:47.11 |
-05:52:13.8 |
HIP 47539 |
40.72 |
| 2026-04-03 12:00 |
09:39:46.05 |
-05:52:01.1 |
HIP 47539 |
41.05 |
| 2026-04-04 00:00 |
09:39:44.99 |
-05:51:48.4 |
HIP 47539 |
41.38 |
| 2026-04-04 12:00 |
09:39:43.95 |
-05:51:35.7 |
HIP 47539 |
41.71 |
| 2026-04-05 00:00 |
09:39:42.92 |
-05:51:22.9 |
HIP 47539 |
42.04 |
| 2026-04-05 12:00 |
09:39:41.90 |
-05:51:10.2 |
HIP 47539 |
42.37 |
| 2026-04-06 00:00 |
09:39:40.89 |
-05:50:57.6 |
HIP 47539 |
42.69 |
| 2026-04-06 12:00 |
09:39:39.89 |
-05:50:44.9 |
HIP 47539 |
43.01 |
| 2026-04-07 00:00 |
09:39:38.91 |
-05:50:32.2 |
HIP 47539 |
43.33 |
| 2026-04-07 12:00 |
09:39:37.93 |
-05:50:19.6 |
HIP 47539 |
43.65 |
| 2026-04-08 00:00 |
09:39:36.97 |
-05:50:06.9 |
HIP 47539 |
43.96 |
| 2026-04-08 12:00 |
09:39:36.02 |
-05:49:54.3 |
HIP 47539 |
44.28 |
| 2026-04-09 00:00 |
09:39:35.08 |
-05:49:41.7 |
HIP 47539 |
44.59 |
| 2026-04-09 12:00 |
09:39:34.15 |
-05:49:29.1 |
HIP 47284 |
44.46 |
| 2026-04-10 00:00 |
09:39:33.24 |
-05:49:16.5 |
HIP 47284 |
44.17 |
| 2026-04-10 12:00 |
09:39:32.33 |
-05:49:04.0 |
HIP 47284 |
43.88 |
| 2026-04-11 00:00 |
09:39:31.44 |
-05:48:51.4 |
HIP 47284 |
43.60 |
| 2026-04-11 12:00 |
09:39:30.57 |
-05:48:38.9 |
HIP 47284 |
43.31 |
| 2026-04-12 00:00 |
09:39:29.70 |
-05:48:26.4 |
HIP 47284 |
43.03 |
| 2026-04-12 12:00 |
09:39:28.85 |
-05:48:13.9 |
HIP 47284 |
42.75 |
| 2026-04-13 00:00 |
09:39:28.00 |
-05:48:01.5 |
HIP 47284 |
42.47 |
| 2026-04-13 12:00 |
09:39:27.18 |
-05:47:49.1 |
HIP 47284 |
42.19 |
| 2026-04-14 00:00 |
09:39:26.36 |
-05:47:36.7 |
HIP 47284 |
41.92 |
| 2026-04-14 12:00 |
09:39:25.56 |
-05:47:24.3 |
HIP 47284 |
41.64 |
| 2026-04-15 00:00 |
09:39:24.76 |
-05:47:11.9 |
HIP 47284 |
41.37 |
| 2026-04-15 12:00 |
09:39:23.99 |
-05:46:59.6 |
HIP 47284 |
41.10 |
| 2026-04-16 00:00 |
09:39:23.22 |
-05:46:47.3 |
HIP 47284 |
40.83 |