C/1979 M1 (Bradfield)
| Parameter |
Value |
| Designation |
C/1979 M1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1979-07-23T06:18:13.374720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
25 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
35.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1979-08-03.0000000 |
| e |
1.00003214 |
| q (au) |
0.413217 |
| a (au) |
-12856.433853 |
| i (deg) |
136.228721 |
| Ω (om, deg) |
164.217096 |
| ω (w, deg) |
47.651179 |
| M (ma, deg) |
0.000007 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.901 + 5.224\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.901 |
| n |
5.224 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
21:43:29.99 |
-40:45:58.9 |
HIP 107115 |
20.11 |
| 2026-02-03 12:00 |
21:43:31.99 |
-40:45:50.1 |
HIP 107115 |
20.44 |
| 2026-02-04 00:00 |
21:43:33.99 |
-40:45:41.4 |
HIP 107115 |
20.78 |
| 2026-02-04 12:00 |
21:43:36.00 |
-40:45:32.8 |
HIP 107115 |
21.12 |
| 2026-02-05 00:00 |
21:43:38.01 |
-40:45:24.3 |
HIP 107115 |
21.46 |
| 2026-02-05 12:00 |
21:43:40.01 |
-40:45:15.9 |
HIP 107115 |
21.80 |
| 2026-02-06 00:00 |
21:43:42.03 |
-40:45:07.6 |
HIP 107115 |
22.15 |
| 2026-02-06 12:00 |
21:43:44.04 |
-40:44:59.3 |
HIP 107115 |
22.50 |
| 2026-02-07 00:00 |
21:43:46.05 |
-40:44:51.2 |
HIP 107115 |
22.85 |
| 2026-02-07 12:00 |
21:43:48.07 |
-40:44:43.1 |
HIP 107115 |
23.20 |
| 2026-02-08 00:00 |
21:43:50.09 |
-40:44:35.1 |
HIP 107115 |
23.56 |
| 2026-02-08 12:00 |
21:43:52.11 |
-40:44:27.2 |
HIP 107115 |
23.92 |
| 2026-02-09 00:00 |
21:43:54.13 |
-40:44:19.4 |
HIP 107115 |
24.28 |
| 2026-02-09 12:00 |
21:43:56.15 |
-40:44:11.7 |
HIP 107115 |
24.64 |
| 2026-02-10 00:00 |
21:43:58.17 |
-40:44:04.1 |
HIP 107115 |
25.01 |
| 2026-02-10 12:00 |
21:44:00.20 |
-40:43:56.6 |
HIP 107115 |
25.37 |
| 2026-02-11 00:00 |
21:44:02.22 |
-40:43:49.1 |
HIP 107115 |
25.74 |
| 2026-02-11 12:00 |
21:44:04.25 |
-40:43:41.8 |
HIP 107115 |
26.11 |
| 2026-02-12 00:00 |
21:44:06.27 |
-40:43:34.6 |
HIP 107115 |
26.48 |
| 2026-02-12 12:00 |
21:44:08.30 |
-40:43:27.4 |
HIP 107115 |
26.85 |
| 2026-02-13 00:00 |
21:44:10.32 |
-40:43:20.3 |
HIP 107115 |
27.22 |
| 2026-02-13 12:00 |
21:44:12.35 |
-40:43:13.4 |
HIP 107115 |
27.59 |
| 2026-02-14 00:00 |
21:44:14.37 |
-40:43:06.5 |
HIP 107115 |
27.96 |
| 2026-02-14 12:00 |
21:44:16.40 |
-40:42:59.8 |
HIP 107115 |
28.34 |
| 2026-02-15 00:00 |
21:44:18.42 |
-40:42:53.1 |
HIP 107115 |
28.71 |
| 2026-02-15 12:00 |
21:44:20.44 |
-40:42:46.5 |
HIP 107115 |
29.09 |
| 2026-02-16 00:00 |
21:44:22.47 |
-40:42:40.0 |
HIP 107115 |
29.47 |
| 2026-02-16 12:00 |
21:44:24.49 |
-40:42:33.7 |
HIP 107115 |
29.84 |
| 2026-02-17 00:00 |
21:44:26.51 |
-40:42:27.4 |
HIP 107115 |
30.22 |
| 2026-02-17 12:00 |
21:44:28.53 |
-40:42:21.2 |
HIP 107115 |
30.60 |
| 2026-02-18 00:00 |
21:44:30.54 |
-40:42:15.1 |
HIP 107115 |
30.98 |
| 2026-02-18 12:00 |
21:44:32.56 |
-40:42:09.1 |
HIP 107115 |
31.35 |
| 2026-02-19 00:00 |
21:44:34.57 |
-40:42:03.3 |
HIP 107115 |
31.73 |
| 2026-02-19 12:00 |
21:44:36.58 |
-40:41:57.5 |
HIP 107115 |
32.11 |
| 2026-02-20 00:00 |
21:44:38.59 |
-40:41:51.8 |
HIP 107115 |
32.49 |
| 2026-02-20 12:00 |
21:44:40.60 |
-40:41:46.3 |
HIP 107565 |
32.79 |
| 2026-02-21 00:00 |
21:44:42.61 |
-40:41:40.8 |
HIP 107565 |
32.52 |
| 2026-02-21 12:00 |
21:44:44.61 |
-40:41:35.4 |
HIP 107565 |
32.24 |
| 2026-02-22 00:00 |
21:44:46.61 |
-40:41:30.2 |
HIP 107565 |
31.97 |
| 2026-02-22 12:00 |
21:44:48.60 |
-40:41:25.0 |
HIP 107565 |
31.70 |
| 2026-02-23 00:00 |
21:44:50.60 |
-40:41:20.0 |
HIP 107565 |
31.43 |
| 2026-02-23 12:00 |
21:44:52.59 |
-40:41:15.0 |
HIP 107565 |
31.16 |
| 2026-02-24 00:00 |
21:44:54.57 |
-40:41:10.2 |
HIP 107565 |
30.89 |