| 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) |
| 2026-05-12 00:00 |
20:37:15.82 |
+14:08:42.5 |
HIP 101769 |
27.32 |
| 2026-05-12 12:00 |
20:37:15.42 |
+14:08:54.0 |
HIP 101769 |
27.14 |
| 2026-05-13 00:00 |
20:37:15.01 |
+14:09:05.4 |
HIP 101769 |
26.97 |
| 2026-05-13 12:00 |
20:37:14.59 |
+14:09:16.7 |
HIP 101769 |
26.80 |
| 2026-05-14 00:00 |
20:37:14.15 |
+14:09:27.9 |
HIP 101769 |
26.64 |
| 2026-05-14 12:00 |
20:37:13.70 |
+14:09:39.1 |
HIP 101769 |
26.47 |
| 2026-05-15 00:00 |
20:37:13.24 |
+14:09:50.2 |
HIP 101769 |
26.31 |
| 2026-05-15 12:00 |
20:37:12.76 |
+14:10:01.2 |
HIP 101769 |
26.15 |
| 2026-05-16 00:00 |
20:37:12.28 |
+14:10:12.2 |
HIP 101769 |
25.99 |
| 2026-05-16 12:00 |
20:37:11.77 |
+14:10:23.1 |
HIP 101769 |
25.84 |
| 2026-05-17 00:00 |
20:37:11.26 |
+14:10:33.9 |
HIP 101769 |
25.69 |
| 2026-05-17 12:00 |
20:37:10.73 |
+14:10:44.6 |
HIP 101769 |
25.54 |
| 2026-05-18 00:00 |
20:37:10.19 |
+14:10:55.3 |
HIP 101769 |
25.39 |
| 2026-05-18 12:00 |
20:37:09.64 |
+14:11:05.8 |
HIP 101769 |
25.25 |
| 2026-05-19 00:00 |
20:37:09.07 |
+14:11:16.3 |
HIP 101769 |
25.11 |
| 2026-05-19 12:00 |
20:37:08.49 |
+14:11:26.8 |
HIP 101769 |
24.97 |
| 2026-05-20 00:00 |
20:37:07.90 |
+14:11:37.1 |
HIP 101769 |
24.84 |
| 2026-05-20 12:00 |
20:37:07.29 |
+14:11:47.4 |
HIP 101769 |
24.71 |
| 2026-05-21 00:00 |
20:37:06.68 |
+14:11:57.6 |
HIP 101769 |
24.59 |
| 2026-05-21 12:00 |
20:37:06.05 |
+14:12:07.7 |
HIP 101769 |
24.46 |
| 2026-05-22 00:00 |
20:37:05.40 |
+14:12:17.7 |
HIP 101769 |
24.34 |
| 2026-05-22 12:00 |
20:37:04.75 |
+14:12:27.6 |
HIP 101769 |
24.23 |
| 2026-05-23 00:00 |
20:37:04.08 |
+14:12:37.5 |
HIP 101769 |
24.12 |
| 2026-05-23 12:00 |
20:37:03.40 |
+14:12:47.2 |
HIP 101769 |
24.01 |
| 2026-05-24 00:00 |
20:37:02.71 |
+14:12:56.9 |
HIP 101769 |
23.91 |
| 2026-05-24 12:00 |
20:37:02.00 |
+14:13:06.5 |
HIP 101769 |
23.81 |
| 2026-05-25 00:00 |
20:37:01.29 |
+14:13:16.0 |
HIP 101769 |
23.71 |
| 2026-05-25 12:00 |
20:37:00.56 |
+14:13:25.5 |
HIP 101769 |
23.62 |
| 2026-05-26 00:00 |
20:36:59.82 |
+14:13:34.8 |
HIP 101769 |
23.53 |
| 2026-05-26 12:00 |
20:36:59.06 |
+14:13:44.0 |
HIP 101769 |
23.45 |
| 2026-05-27 00:00 |
20:36:58.30 |
+14:13:53.2 |
HIP 101769 |
23.38 |
| 2026-05-27 12:00 |
20:36:57.52 |
+14:14:02.3 |
HIP 101769 |
23.30 |
| 2026-05-28 00:00 |
20:36:56.73 |
+14:14:11.3 |
HIP 101769 |
23.24 |
| 2026-05-28 12:00 |
20:36:55.93 |
+14:14:20.2 |
HIP 101769 |
23.17 |
| 2026-05-29 00:00 |
20:36:55.12 |
+14:14:29.0 |
HIP 101769 |
23.11 |
| 2026-05-29 12:00 |
20:36:54.29 |
+14:14:37.7 |
HIP 101769 |
23.06 |
| 2026-05-30 00:00 |
20:36:53.46 |
+14:14:46.3 |
HIP 101769 |
23.01 |
| 2026-05-30 12:00 |
20:36:52.61 |
+14:14:54.8 |
HIP 101769 |
22.97 |
| 2026-05-31 00:00 |
20:36:51.75 |
+14:15:03.2 |
HIP 101769 |
22.93 |
| 2026-05-31 12:00 |
20:36:50.88 |
+14:15:11.6 |
HIP 101769 |
22.90 |
| 2026-06-01 00:00 |
20:36:50.00 |
+14:15:19.8 |
HIP 101769 |
22.87 |
| 2026-06-01 12:00 |
20:36:49.10 |
+14:15:28.0 |
HIP 101769 |
22.85 |
| 2026-06-02 00:00 |
20:36:48.20 |
+14:15:36.0 |
HIP 101769 |
22.84 |