| Parameter |
Value |
| Designation |
C/1963 F1 (Alcock) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1963-05-05T21:06:43.280640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
25 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1963-05-15.0000000 |
| e |
0.99791950 |
| q (au) |
1.537080 |
| a (au) |
738.804223 |
| i (deg) |
86.218793 |
| Ω (om, deg) |
43.465153 |
| ω (w, deg) |
146.621136 |
| M (ma, deg) |
0.000448 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.297 + 5.819\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.297 |
| n |
5.819 |
| gf |
1.000 |
| gb |
-0.539 |
| 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) |
| 2026-03-26 00:00 |
03:28:56.35 |
-30:43:27.8 |
HIP 16192 |
10.38 |
| 2026-03-26 12:00 |
03:28:57.33 |
-30:43:13.3 |
HIP 16192 |
10.25 |
| 2026-03-27 00:00 |
03:28:58.32 |
-30:42:58.9 |
HIP 16192 |
10.14 |
| 2026-03-27 12:00 |
03:28:59.32 |
-30:42:44.5 |
HIP 16192 |
10.03 |
| 2026-03-28 00:00 |
03:29:00.34 |
-30:42:30.2 |
HIP 16192 |
9.94 |
| 2026-03-28 12:00 |
03:29:01.36 |
-30:42:16.0 |
HIP 16192 |
9.86 |
| 2026-03-29 00:00 |
03:29:02.39 |
-30:42:01.9 |
HIP 16192 |
9.79 |
| 2026-03-29 12:00 |
03:29:03.42 |
-30:41:47.8 |
HIP 16192 |
9.74 |
| 2026-03-30 00:00 |
03:29:04.47 |
-30:41:33.8 |
HIP 16192 |
9.69 |
| 2026-03-30 12:00 |
03:29:05.53 |
-30:41:19.9 |
HIP 16192 |
9.66 |
| 2026-03-31 00:00 |
03:29:06.60 |
-30:41:06.0 |
HIP 16192 |
9.64 |
| 2026-03-31 12:00 |
03:29:07.67 |
-30:40:52.2 |
HIP 16192 |
9.64 |
| 2026-04-01 00:00 |
03:29:08.76 |
-30:40:38.5 |
HIP 16192 |
9.65 |
| 2026-04-01 12:00 |
03:29:09.85 |
-30:40:24.9 |
HIP 16192 |
9.67 |
| 2026-04-02 00:00 |
03:29:10.96 |
-30:40:11.4 |
HIP 16192 |
9.71 |
| 2026-04-02 12:00 |
03:29:12.07 |
-30:39:57.9 |
HIP 16192 |
9.76 |
| 2026-04-03 00:00 |
03:29:13.19 |
-30:39:44.5 |
HIP 16192 |
9.82 |
| 2026-04-03 12:00 |
03:29:14.32 |
-30:39:31.2 |
HIP 16192 |
9.89 |
| 2026-04-04 00:00 |
03:29:15.46 |
-30:39:18.0 |
HIP 16192 |
9.98 |
| 2026-04-04 12:00 |
03:29:16.60 |
-30:39:04.9 |
HIP 16192 |
10.08 |
| 2026-04-05 00:00 |
03:29:17.76 |
-30:38:51.8 |
HIP 16192 |
10.19 |
| 2026-04-05 12:00 |
03:29:18.92 |
-30:38:38.9 |
HIP 16192 |
10.31 |
| 2026-04-06 00:00 |
03:29:20.09 |
-30:38:26.0 |
HIP 16192 |
10.45 |
| 2026-04-06 12:00 |
03:29:21.27 |
-30:38:13.2 |
HIP 16192 |
10.59 |
| 2026-04-07 00:00 |
03:29:22.45 |
-30:38:00.5 |
HIP 16192 |
10.75 |
| 2026-04-07 12:00 |
03:29:23.65 |
-30:37:47.9 |
HIP 16192 |
10.92 |
| 2026-04-08 00:00 |
03:29:24.85 |
-30:37:35.4 |
HIP 16192 |
11.09 |
| 2026-04-08 12:00 |
03:29:26.06 |
-30:37:22.9 |
HIP 16192 |
11.28 |
| 2026-04-09 00:00 |
03:29:27.28 |
-30:37:10.6 |
HIP 16192 |
11.47 |
| 2026-04-09 12:00 |
03:29:28.51 |
-30:36:58.3 |
HIP 16192 |
11.67 |
| 2026-04-10 00:00 |
03:29:29.74 |
-30:36:46.2 |
HIP 16192 |
11.88 |
| 2026-04-10 12:00 |
03:29:30.98 |
-30:36:34.1 |
HIP 16192 |
12.10 |
| 2026-04-11 00:00 |
03:29:32.23 |
-30:36:22.1 |
HIP 16192 |
12.32 |
| 2026-04-11 12:00 |
03:29:33.48 |
-30:36:10.2 |
HIP 16192 |
12.55 |
| 2026-04-12 00:00 |
03:29:34.75 |
-30:35:58.4 |
HIP 16192 |
12.79 |
| 2026-04-12 12:00 |
03:29:36.02 |
-30:35:46.8 |
HIP 16192 |
13.03 |
| 2026-04-13 00:00 |
03:29:37.29 |
-30:35:35.2 |
HIP 16192 |
13.28 |
| 2026-04-13 12:00 |
03:29:38.58 |
-30:35:23.7 |
HIP 16192 |
13.53 |
| 2026-04-14 00:00 |
03:29:39.87 |
-30:35:12.3 |
HIP 16192 |
13.79 |
| 2026-04-14 12:00 |
03:29:41.16 |
-30:35:01.0 |
HIP 16192 |
14.06 |
| 2026-04-15 00:00 |
03:29:42.47 |
-30:34:49.8 |
HIP 16192 |
14.33 |
| 2026-04-15 12:00 |
03:29:43.78 |
-30:34:38.7 |
HIP 16192 |
14.60 |
| 2026-04-16 00:00 |
03:29:45.09 |
-30:34:27.7 |
HIP 16192 |
14.88 |