C/1978 T3 (Bradfield)
| Parameter |
Value |
| Designation |
C/1978 T3 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-09-29T02:01:57.146880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
14 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1978-10-19.0000000 |
| e |
0.99999921 |
| q (au) |
0.431792 |
| a (au) |
547482.576663 |
| i (deg) |
138.267856 |
| Ω (om, deg) |
358.421984 |
| ω (w, deg) |
240.439277 |
| M (ma, deg) |
0.000000 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.272 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.272 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
20:34:41.07 |
+13:29:18.0 |
HIP 101554 |
2.42 |
| 2026-02-03 12:00 |
20:34:42.65 |
+13:29:24.8 |
HIP 101554 |
2.20 |
| 2026-02-04 00:00 |
20:34:44.23 |
+13:29:31.7 |
HIP 101554 |
2.04 |
| 2026-02-04 12:00 |
20:34:45.81 |
+13:29:38.7 |
HIP 101554 |
1.94 |
| 2026-02-05 00:00 |
20:34:47.38 |
+13:29:45.9 |
HIP 101554 |
1.93 |
| 2026-02-05 12:00 |
20:34:48.96 |
+13:29:53.1 |
HIP 101554 |
2.00 |
| 2026-02-06 00:00 |
20:34:50.53 |
+13:30:00.4 |
HIP 101554 |
2.15 |
| 2026-02-06 12:00 |
20:34:52.09 |
+13:30:07.8 |
HIP 101554 |
2.36 |
| 2026-02-07 00:00 |
20:34:53.66 |
+13:30:15.4 |
HIP 101554 |
2.62 |
| 2026-02-07 12:00 |
20:34:55.22 |
+13:30:23.0 |
HIP 101554 |
2.91 |
| 2026-02-08 00:00 |
20:34:56.78 |
+13:30:30.7 |
HIP 101554 |
3.22 |
| 2026-02-08 12:00 |
20:34:58.34 |
+13:30:38.5 |
HIP 101554 |
3.55 |
| 2026-02-09 00:00 |
20:34:59.89 |
+13:30:46.5 |
HIP 101554 |
3.90 |
| 2026-02-09 12:00 |
20:35:01.44 |
+13:30:54.5 |
HIP 101554 |
4.25 |
| 2026-02-10 00:00 |
20:35:02.99 |
+13:31:02.6 |
HIP 101554 |
4.62 |
| 2026-02-10 12:00 |
20:35:04.53 |
+13:31:10.8 |
HIP 101554 |
4.99 |
| 2026-02-11 00:00 |
20:35:06.07 |
+13:31:19.2 |
HIP 101554 |
5.36 |
| 2026-02-11 12:00 |
20:35:07.60 |
+13:31:27.6 |
HIP 101554 |
5.74 |
| 2026-02-12 00:00 |
20:35:09.14 |
+13:31:36.1 |
HIP 101554 |
6.12 |
| 2026-02-12 12:00 |
20:35:10.66 |
+13:31:44.7 |
HIP 101554 |
6.50 |
| 2026-02-13 00:00 |
20:35:12.19 |
+13:31:53.4 |
HIP 101554 |
6.89 |
| 2026-02-13 12:00 |
20:35:13.71 |
+13:32:02.2 |
HIP 101554 |
7.27 |
| 2026-02-14 00:00 |
20:35:15.22 |
+13:32:11.1 |
HIP 101554 |
7.66 |
| 2026-02-14 12:00 |
20:35:16.73 |
+13:32:20.1 |
HIP 101554 |
8.05 |
| 2026-02-15 00:00 |
20:35:18.24 |
+13:32:29.1 |
HIP 101554 |
8.44 |
| 2026-02-15 12:00 |
20:35:19.74 |
+13:32:38.3 |
HIP 101554 |
8.83 |
| 2026-02-16 00:00 |
20:35:21.24 |
+13:32:47.6 |
HIP 101554 |
9.22 |
| 2026-02-16 12:00 |
20:35:22.73 |
+13:32:56.9 |
HIP 101554 |
9.61 |
| 2026-02-17 00:00 |
20:35:24.22 |
+13:33:06.3 |
HIP 101554 |
10.00 |
| 2026-02-17 12:00 |
20:35:25.70 |
+13:33:15.9 |
HIP 101554 |
10.39 |
| 2026-02-18 00:00 |
20:35:27.18 |
+13:33:25.5 |
HIP 101554 |
10.78 |
| 2026-02-18 12:00 |
20:35:28.65 |
+13:33:35.2 |
HIP 101554 |
11.17 |
| 2026-02-19 00:00 |
20:35:30.12 |
+13:33:45.0 |
HIP 101554 |
11.56 |
| 2026-02-19 12:00 |
20:35:31.58 |
+13:33:54.8 |
HIP 101554 |
11.95 |
| 2026-02-20 00:00 |
20:35:33.03 |
+13:34:04.8 |
HIP 101554 |
12.34 |
| 2026-02-20 12:00 |
20:35:34.48 |
+13:34:14.8 |
HIP 101554 |
12.73 |
| 2026-02-21 00:00 |
20:35:35.92 |
+13:34:24.9 |
HIP 101554 |
13.11 |
| 2026-02-21 12:00 |
20:35:37.36 |
+13:34:35.2 |
HIP 101554 |
13.50 |
| 2026-02-22 00:00 |
20:35:38.79 |
+13:34:45.4 |
HIP 101554 |
13.89 |
| 2026-02-22 12:00 |
20:35:40.21 |
+13:34:55.8 |
HIP 101554 |
14.28 |
| 2026-02-23 00:00 |
20:35:41.63 |
+13:35:06.2 |
HIP 101554 |
14.66 |
| 2026-02-23 12:00 |
20:35:43.04 |
+13:35:16.8 |
HIP 101554 |
15.05 |
| 2026-02-24 00:00 |
20:35:44.45 |
+13:35:27.4 |
HIP 101554 |
15.43 |