C/1981 M1 (Gonzalez)

Metadata

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

C/1981 M1 (Gonzalez) · Magnitude (Full range)

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