| 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) |
| 2026-09-25 00:00 |
20:31:32.10 |
+13:59:16.0 |
HIP 101181 |
17.52 |
| 2026-09-25 12:00 |
20:31:31.21 |
+13:59:02.3 |
HIP 101181 |
17.21 |
| 2026-09-26 00:00 |
20:31:30.34 |
+13:58:48.7 |
HIP 101181 |
16.91 |
| 2026-09-26 12:00 |
20:31:29.47 |
+13:58:35.0 |
HIP 101181 |
16.61 |
| 2026-09-27 00:00 |
20:31:28.62 |
+13:58:21.3 |
HIP 101181 |
16.31 |
| 2026-09-27 12:00 |
20:31:27.78 |
+13:58:07.5 |
HIP 101181 |
16.01 |
| 2026-09-28 00:00 |
20:31:26.95 |
+13:57:53.8 |
HIP 101181 |
15.71 |
| 2026-09-28 12:00 |
20:31:26.13 |
+13:57:40.0 |
HIP 101181 |
15.42 |
| 2026-09-29 00:00 |
20:31:25.32 |
+13:57:26.2 |
HIP 101181 |
15.13 |
| 2026-09-29 12:00 |
20:31:24.53 |
+13:57:12.4 |
HIP 101181 |
14.84 |
| 2026-09-30 00:00 |
20:31:23.75 |
+13:56:58.5 |
HIP 101181 |
14.56 |
| 2026-09-30 12:00 |
20:31:22.98 |
+13:56:44.7 |
HIP 101181 |
14.27 |
| 2026-10-01 00:00 |
20:31:22.22 |
+13:56:30.8 |
HIP 101181 |
13.99 |
| 2026-10-01 12:00 |
20:31:21.48 |
+13:56:16.9 |
HIP 101181 |
13.72 |
| 2026-10-02 00:00 |
20:31:20.74 |
+13:56:03.0 |
HIP 101181 |
13.45 |
| 2026-10-02 12:00 |
20:31:20.02 |
+13:55:49.1 |
HIP 101181 |
13.18 |
| 2026-10-03 00:00 |
20:31:19.32 |
+13:55:35.2 |
HIP 101181 |
12.91 |
| 2026-10-03 12:00 |
20:31:18.62 |
+13:55:21.3 |
HIP 101181 |
12.65 |
| 2026-10-04 00:00 |
20:31:17.94 |
+13:55:07.4 |
HIP 101181 |
12.39 |
| 2026-10-04 12:00 |
20:31:17.27 |
+13:54:53.5 |
HIP 101181 |
12.13 |
| 2026-10-05 00:00 |
20:31:16.61 |
+13:54:39.5 |
HIP 101181 |
11.88 |
| 2026-10-05 12:00 |
20:31:15.97 |
+13:54:25.6 |
HIP 101181 |
11.64 |
| 2026-10-06 00:00 |
20:31:15.34 |
+13:54:11.6 |
HIP 101181 |
11.39 |
| 2026-10-06 12:00 |
20:31:14.72 |
+13:53:57.7 |
HIP 101181 |
11.16 |
| 2026-10-07 00:00 |
20:31:14.11 |
+13:53:43.7 |
HIP 101181 |
10.92 |
| 2026-10-07 12:00 |
20:31:13.52 |
+13:53:29.8 |
HIP 101181 |
10.69 |
| 2026-10-08 00:00 |
20:31:12.94 |
+13:53:15.8 |
HIP 101181 |
10.47 |
| 2026-10-08 12:00 |
20:31:12.38 |
+13:53:01.9 |
HIP 101181 |
10.25 |
| 2026-10-09 00:00 |
20:31:11.82 |
+13:52:47.9 |
HIP 101181 |
10.04 |
| 2026-10-09 12:00 |
20:31:11.28 |
+13:52:34.0 |
HIP 101181 |
9.83 |
| 2026-10-10 00:00 |
20:31:10.76 |
+13:52:20.0 |
HIP 101181 |
9.63 |
| 2026-10-10 12:00 |
20:31:10.24 |
+13:52:06.1 |
HIP 101181 |
9.44 |
| 2026-10-11 00:00 |
20:31:09.74 |
+13:51:52.2 |
HIP 101181 |
9.25 |
| 2026-10-11 12:00 |
20:31:09.26 |
+13:51:38.3 |
HIP 101181 |
9.07 |
| 2026-10-12 00:00 |
20:31:08.78 |
+13:51:24.4 |
HIP 101181 |
8.89 |
| 2026-10-12 12:00 |
20:31:08.33 |
+13:51:10.5 |
HIP 101181 |
8.73 |
| 2026-10-13 00:00 |
20:31:07.88 |
+13:50:56.6 |
HIP 101181 |
8.57 |
| 2026-10-13 12:00 |
20:31:07.45 |
+13:50:42.7 |
HIP 101181 |
8.42 |
| 2026-10-14 00:00 |
20:31:07.03 |
+13:50:28.8 |
HIP 101181 |
8.27 |
| 2026-10-14 12:00 |
20:31:06.62 |
+13:50:15.0 |
HIP 101181 |
8.14 |
| 2026-10-15 00:00 |
20:31:06.23 |
+13:50:01.2 |
HIP 101181 |
8.01 |
| 2026-10-15 12:00 |
20:31:05.85 |
+13:49:47.4 |
HIP 101181 |
7.90 |
| 2026-10-16 00:00 |
20:31:05.49 |
+13:49:33.6 |
HIP 101181 |
7.79 |