| Parameter |
Value |
| Designation |
C/1976 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-02-25T01:22:13.275840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1976-03-12.0000000 |
| e |
0.99987070 |
| q (au) |
0.678293 |
| a (au) |
5245.712828 |
| i (deg) |
147.778213 |
| Ω (om, deg) |
70.213442 |
| ω (w, deg) |
221.765775 |
| M (ma, deg) |
0.000041 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.087 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.087 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.972 |
| 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) |
| 2026-06-01 00:00 |
02:18:32.39 |
+30:35:37.5 |
HIP 10884 |
31.40 |
| 2026-06-01 12:00 |
02:18:33.81 |
+30:35:47.5 |
HIP 10884 |
31.34 |
| 2026-06-02 00:00 |
02:18:35.22 |
+30:35:57.5 |
HIP 10884 |
31.28 |
| 2026-06-02 12:00 |
02:18:36.62 |
+30:36:07.5 |
HIP 10884 |
31.23 |
| 2026-06-03 00:00 |
02:18:38.02 |
+30:36:17.5 |
HIP 10884 |
31.18 |
| 2026-06-03 12:00 |
02:18:39.40 |
+30:36:27.5 |
HIP 10884 |
31.14 |
| 2026-06-04 00:00 |
02:18:40.78 |
+30:36:37.5 |
HIP 10884 |
31.10 |
| 2026-06-04 12:00 |
02:18:42.15 |
+30:36:47.5 |
HIP 10954 |
30.83 |
| 2026-06-05 00:00 |
02:18:43.51 |
+30:36:57.6 |
HIP 10954 |
30.52 |
| 2026-06-05 12:00 |
02:18:44.87 |
+30:37:07.6 |
HIP 10954 |
30.22 |
| 2026-06-06 00:00 |
02:18:46.21 |
+30:37:17.7 |
HIP 10954 |
29.91 |
| 2026-06-06 12:00 |
02:18:47.55 |
+30:37:27.7 |
HIP 10954 |
29.61 |
| 2026-06-07 00:00 |
02:18:48.87 |
+30:37:37.8 |
HIP 10954 |
29.30 |
| 2026-06-07 12:00 |
02:18:50.19 |
+30:37:47.9 |
HIP 10954 |
29.01 |
| 2026-06-08 00:00 |
02:18:51.50 |
+30:37:58.0 |
HIP 10954 |
28.71 |
| 2026-06-08 12:00 |
02:18:52.80 |
+30:38:08.1 |
HIP 10954 |
28.42 |
| 2026-06-09 00:00 |
02:18:54.09 |
+30:38:18.2 |
HIP 10954 |
28.13 |
| 2026-06-09 12:00 |
02:18:55.37 |
+30:38:28.3 |
HIP 10954 |
27.84 |
| 2026-06-10 00:00 |
02:18:56.64 |
+30:38:38.4 |
HIP 10954 |
27.55 |
| 2026-06-10 12:00 |
02:18:57.91 |
+30:38:48.5 |
HIP 10954 |
27.27 |
| 2026-06-11 00:00 |
02:18:59.16 |
+30:38:58.6 |
HIP 10954 |
26.99 |
| 2026-06-11 12:00 |
02:19:00.40 |
+30:39:08.7 |
HIP 10954 |
26.72 |
| 2026-06-12 00:00 |
02:19:01.63 |
+30:39:18.8 |
HIP 10954 |
26.44 |
| 2026-06-12 12:00 |
02:19:02.86 |
+30:39:28.9 |
HIP 10954 |
26.17 |
| 2026-06-13 00:00 |
02:19:04.07 |
+30:39:39.0 |
HIP 10954 |
25.91 |
| 2026-06-13 12:00 |
02:19:05.27 |
+30:39:49.1 |
HIP 10954 |
25.64 |
| 2026-06-14 00:00 |
02:19:06.47 |
+30:39:59.2 |
HIP 10954 |
25.38 |
| 2026-06-14 12:00 |
02:19:07.65 |
+30:40:09.3 |
HIP 10954 |
25.12 |
| 2026-06-15 00:00 |
02:19:08.82 |
+30:40:19.4 |
HIP 10954 |
24.87 |
| 2026-06-15 12:00 |
02:19:09.98 |
+30:40:29.4 |
HIP 10954 |
24.62 |
| 2026-06-16 00:00 |
02:19:11.13 |
+30:40:39.5 |
HIP 10954 |
24.37 |
| 2026-06-16 12:00 |
02:19:12.27 |
+30:40:49.6 |
HIP 10954 |
24.13 |
| 2026-06-17 00:00 |
02:19:13.40 |
+30:40:59.7 |
HIP 10954 |
23.89 |
| 2026-06-17 12:00 |
02:19:14.52 |
+30:41:09.7 |
HIP 10954 |
23.65 |
| 2026-06-18 00:00 |
02:19:15.63 |
+30:41:19.8 |
HIP 10954 |
23.42 |
| 2026-06-18 12:00 |
02:19:16.73 |
+30:41:29.8 |
HIP 10954 |
23.19 |
| 2026-06-19 00:00 |
02:19:17.81 |
+30:41:39.8 |
HIP 10954 |
22.96 |
| 2026-06-19 12:00 |
02:19:18.89 |
+30:41:49.8 |
HIP 10954 |
22.74 |
| 2026-06-20 00:00 |
02:19:19.95 |
+30:41:59.8 |
HIP 10954 |
22.52 |
| 2026-06-20 12:00 |
02:19:21.00 |
+30:42:09.8 |
HIP 10954 |
22.31 |
| 2026-06-21 00:00 |
02:19:22.05 |
+30:42:19.8 |
HIP 10954 |
22.10 |
| 2026-06-21 12:00 |
02:19:23.07 |
+30:42:29.8 |
HIP 10954 |
21.89 |
| 2026-06-22 00:00 |
02:19:24.09 |
+30:42:39.7 |
HIP 10954 |
21.69 |