| 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) |
| 2026-06-01 00:00 |
21:47:57.86 |
-40:58:16.3 |
HIP 107565 |
9.16 |
| 2026-06-01 12:00 |
21:47:57.32 |
-40:58:29.3 |
HIP 107565 |
9.05 |
| 2026-06-02 00:00 |
21:47:56.75 |
-40:58:42.3 |
HIP 107565 |
8.94 |
| 2026-06-02 12:00 |
21:47:56.17 |
-40:58:55.4 |
HIP 107565 |
8.84 |
| 2026-06-03 00:00 |
21:47:55.57 |
-40:59:08.5 |
HIP 107565 |
8.73 |
| 2026-06-03 12:00 |
21:47:54.96 |
-40:59:21.7 |
HIP 107565 |
8.64 |
| 2026-06-04 00:00 |
21:47:54.33 |
-40:59:34.8 |
HIP 107565 |
8.54 |
| 2026-06-04 12:00 |
21:47:53.69 |
-40:59:48.1 |
HIP 107565 |
8.45 |
| 2026-06-05 00:00 |
21:47:53.02 |
-41:00:01.3 |
HIP 107565 |
8.36 |
| 2026-06-05 12:00 |
21:47:52.34 |
-41:00:14.5 |
HIP 107565 |
8.27 |
| 2026-06-06 00:00 |
21:47:51.65 |
-41:00:27.8 |
HIP 107565 |
8.19 |
| 2026-06-06 12:00 |
21:47:50.94 |
-41:00:41.1 |
HIP 107565 |
8.11 |
| 2026-06-07 00:00 |
21:47:50.21 |
-41:00:54.5 |
HIP 107565 |
8.04 |
| 2026-06-07 12:00 |
21:47:49.47 |
-41:01:07.8 |
HIP 107565 |
7.97 |
| 2026-06-08 00:00 |
21:47:48.71 |
-41:01:21.2 |
HIP 107565 |
7.91 |
| 2026-06-08 12:00 |
21:47:47.93 |
-41:01:34.6 |
HIP 107565 |
7.86 |
| 2026-06-09 00:00 |
21:47:47.14 |
-41:01:48.1 |
HIP 107565 |
7.81 |
| 2026-06-09 12:00 |
21:47:46.33 |
-41:02:01.5 |
HIP 107565 |
7.76 |
| 2026-06-10 00:00 |
21:47:45.51 |
-41:02:15.0 |
HIP 107565 |
7.73 |
| 2026-06-10 12:00 |
21:47:44.67 |
-41:02:28.5 |
HIP 107565 |
7.70 |
| 2026-06-11 00:00 |
21:47:43.81 |
-41:02:42.0 |
HIP 107565 |
7.68 |
| 2026-06-11 12:00 |
21:47:42.94 |
-41:02:55.5 |
HIP 107565 |
7.66 |
| 2026-06-12 00:00 |
21:47:42.05 |
-41:03:09.0 |
HIP 107565 |
7.66 |
| 2026-06-12 12:00 |
21:47:41.15 |
-41:03:22.6 |
HIP 107565 |
7.66 |
| 2026-06-13 00:00 |
21:47:40.23 |
-41:03:36.2 |
HIP 107565 |
7.67 |
| 2026-06-13 12:00 |
21:47:39.30 |
-41:03:49.7 |
HIP 107565 |
7.69 |
| 2026-06-14 00:00 |
21:47:38.35 |
-41:04:03.3 |
HIP 107565 |
7.71 |
| 2026-06-14 12:00 |
21:47:37.38 |
-41:04:16.9 |
HIP 107565 |
7.75 |
| 2026-06-15 00:00 |
21:47:36.40 |
-41:04:30.5 |
HIP 107565 |
7.80 |
| 2026-06-15 12:00 |
21:47:35.41 |
-41:04:44.1 |
HIP 107565 |
7.85 |
| 2026-06-16 00:00 |
21:47:34.39 |
-41:04:57.8 |
HIP 107565 |
7.91 |
| 2026-06-16 12:00 |
21:47:33.37 |
-41:05:11.4 |
HIP 107565 |
7.99 |
| 2026-06-17 00:00 |
21:47:32.33 |
-41:05:25.0 |
HIP 107565 |
8.07 |
| 2026-06-17 12:00 |
21:47:31.27 |
-41:05:38.7 |
HIP 107565 |
8.16 |
| 2026-06-18 00:00 |
21:47:30.20 |
-41:05:52.3 |
HIP 107565 |
8.26 |
| 2026-06-18 12:00 |
21:47:29.11 |
-41:06:05.9 |
HIP 107565 |
8.36 |
| 2026-06-19 00:00 |
21:47:28.01 |
-41:06:19.6 |
HIP 107565 |
8.48 |
| 2026-06-19 12:00 |
21:47:26.90 |
-41:06:33.2 |
HIP 107565 |
8.60 |
| 2026-06-20 00:00 |
21:47:25.77 |
-41:06:46.9 |
HIP 107565 |
8.74 |
| 2026-06-20 12:00 |
21:47:24.62 |
-41:07:00.5 |
HIP 107565 |
8.88 |
| 2026-06-21 00:00 |
21:47:23.46 |
-41:07:14.1 |
HIP 107565 |
9.03 |
| 2026-06-21 12:00 |
21:47:22.29 |
-41:07:27.7 |
HIP 107565 |
9.18 |
| 2026-06-22 00:00 |
21:47:21.10 |
-41:07:41.4 |
HIP 107565 |
9.35 |