C/1975 V2 (Bradfield)
| Parameter |
Value |
| Designation |
C/1975 V2 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-12-21T04:20:57.010560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
16.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1975-12-22.0000000 |
| e |
1.00001538 |
| q (au) |
0.218721 |
| a (au) |
-14217.185675 |
| i (deg) |
70.626160 |
| Ω (om, deg) |
271.312759 |
| ω (w, deg) |
358.089866 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.332 + 3.967\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.332 |
| n |
3.967 |
| gf |
0.800 |
| gb |
-0.640 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
05:50:44.73 |
+30:57:16.6 |
HIP 27582 |
7.46 |
| 2026-02-03 12:00 |
05:50:43.43 |
+30:57:13.8 |
HIP 27582 |
7.37 |
| 2026-02-04 00:00 |
05:50:42.15 |
+30:57:11.1 |
HIP 27582 |
7.30 |
| 2026-02-04 12:00 |
05:50:40.87 |
+30:57:08.3 |
HIP 27582 |
7.25 |
| 2026-02-05 00:00 |
05:50:39.62 |
+30:57:05.6 |
HIP 27582 |
7.20 |
| 2026-02-05 12:00 |
05:50:38.37 |
+30:57:02.8 |
HIP 27582 |
7.16 |
| 2026-02-06 00:00 |
05:50:37.13 |
+30:57:00.0 |
HIP 27582 |
7.14 |
| 2026-02-06 12:00 |
05:50:35.91 |
+30:56:57.2 |
HIP 27582 |
7.12 |
| 2026-02-07 00:00 |
05:50:34.70 |
+30:56:54.3 |
HIP 27582 |
7.12 |
| 2026-02-07 12:00 |
05:50:33.50 |
+30:56:51.5 |
HIP 27582 |
7.12 |
| 2026-02-08 00:00 |
05:50:32.32 |
+30:56:48.6 |
HIP 27582 |
7.14 |
| 2026-02-08 12:00 |
05:50:31.15 |
+30:56:45.7 |
HIP 27582 |
7.17 |
| 2026-02-09 00:00 |
05:50:29.99 |
+30:56:42.9 |
HIP 27582 |
7.20 |
| 2026-02-09 12:00 |
05:50:28.85 |
+30:56:39.9 |
HIP 27582 |
7.25 |
| 2026-02-10 00:00 |
05:50:27.71 |
+30:56:37.0 |
HIP 27582 |
7.30 |
| 2026-02-10 12:00 |
05:50:26.59 |
+30:56:34.1 |
HIP 27582 |
7.36 |
| 2026-02-11 00:00 |
05:50:25.49 |
+30:56:31.1 |
HIP 27582 |
7.43 |
| 2026-02-11 12:00 |
05:50:24.40 |
+30:56:28.2 |
HIP 27582 |
7.50 |
| 2026-02-12 00:00 |
05:50:23.32 |
+30:56:25.2 |
HIP 27582 |
7.59 |
| 2026-02-12 12:00 |
05:50:22.25 |
+30:56:22.2 |
HIP 27582 |
7.67 |
| 2026-02-13 00:00 |
05:50:21.20 |
+30:56:19.2 |
HIP 27582 |
7.77 |
| 2026-02-13 12:00 |
05:50:20.16 |
+30:56:16.2 |
HIP 27582 |
7.87 |
| 2026-02-14 00:00 |
05:50:19.14 |
+30:56:13.2 |
HIP 27582 |
7.97 |
| 2026-02-14 12:00 |
05:50:18.13 |
+30:56:10.1 |
HIP 27582 |
8.08 |
| 2026-02-15 00:00 |
05:50:17.13 |
+30:56:07.1 |
HIP 27582 |
8.19 |
| 2026-02-15 12:00 |
05:50:16.15 |
+30:56:04.0 |
HIP 27582 |
8.31 |
| 2026-02-16 00:00 |
05:50:15.18 |
+30:56:01.0 |
HIP 27582 |
8.42 |
| 2026-02-16 12:00 |
05:50:14.23 |
+30:55:57.9 |
HIP 27582 |
8.54 |
| 2026-02-17 00:00 |
05:50:13.29 |
+30:55:54.8 |
HIP 27582 |
8.67 |
| 2026-02-17 12:00 |
05:50:12.36 |
+30:55:51.7 |
HIP 27582 |
8.79 |
| 2026-02-18 00:00 |
05:50:11.45 |
+30:55:48.6 |
HIP 27582 |
8.92 |
| 2026-02-18 12:00 |
05:50:10.56 |
+30:55:45.5 |
HIP 27582 |
9.05 |
| 2026-02-19 00:00 |
05:50:09.67 |
+30:55:42.3 |
HIP 27582 |
9.18 |
| 2026-02-19 12:00 |
05:50:08.81 |
+30:55:39.2 |
HIP 27582 |
9.31 |
| 2026-02-20 00:00 |
05:50:07.95 |
+30:55:36.1 |
HIP 27582 |
9.44 |
| 2026-02-20 12:00 |
05:50:07.12 |
+30:55:32.9 |
HIP 27582 |
9.58 |
| 2026-02-21 00:00 |
05:50:06.29 |
+30:55:29.7 |
HIP 27582 |
9.71 |
| 2026-02-21 12:00 |
05:50:05.48 |
+30:55:26.6 |
HIP 27582 |
9.84 |
| 2026-02-22 00:00 |
05:50:04.69 |
+30:55:23.4 |
HIP 27582 |
9.97 |
| 2026-02-22 12:00 |
05:50:03.91 |
+30:55:20.2 |
HIP 27582 |
10.11 |
| 2026-02-23 00:00 |
05:50:03.15 |
+30:55:17.0 |
HIP 27582 |
10.24 |
| 2026-02-23 12:00 |
05:50:02.40 |
+30:55:13.8 |
HIP 27582 |
10.37 |
| 2026-02-24 00:00 |
05:50:01.67 |
+30:55:10.6 |
HIP 27582 |
10.50 |