C/1963 F1 (Alcock)
| 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) |
| 2026-02-03 00:00 |
03:28:19.16 |
-31:10:46.5 |
HIP 16239 |
32.09 |
| 2026-02-03 12:00 |
03:28:18.85 |
-31:10:30.9 |
HIP 16239 |
32.36 |
| 2026-02-04 00:00 |
03:28:18.56 |
-31:10:15.3 |
HIP 16239 |
32.62 |
| 2026-02-04 12:00 |
03:28:18.29 |
-31:09:59.6 |
HIP 16239 |
32.88 |
| 2026-02-05 00:00 |
03:28:18.02 |
-31:09:43.9 |
HIP 16239 |
33.15 |
| 2026-02-05 12:00 |
03:28:17.77 |
-31:09:28.2 |
HIP 16239 |
33.41 |
| 2026-02-06 00:00 |
03:28:17.54 |
-31:09:12.4 |
HIP 16239 |
33.67 |
| 2026-02-06 12:00 |
03:28:17.31 |
-31:08:56.5 |
HIP 16239 |
33.93 |
| 2026-02-07 00:00 |
03:28:17.11 |
-31:08:40.6 |
HIP 16239 |
34.20 |
| 2026-02-07 12:00 |
03:28:16.91 |
-31:08:24.7 |
HIP 16239 |
34.46 |
| 2026-02-08 00:00 |
03:28:16.73 |
-31:08:08.7 |
HIP 16192 |
34.34 |
| 2026-02-08 12:00 |
03:28:16.56 |
-31:07:52.7 |
HIP 16192 |
34.08 |
| 2026-02-09 00:00 |
03:28:16.41 |
-31:07:36.7 |
HIP 16192 |
33.82 |
| 2026-02-09 12:00 |
03:28:16.27 |
-31:07:20.6 |
HIP 16192 |
33.56 |
| 2026-02-10 00:00 |
03:28:16.14 |
-31:07:04.5 |
HIP 16192 |
33.30 |
| 2026-02-10 12:00 |
03:28:16.03 |
-31:06:48.3 |
HIP 16192 |
33.03 |
| 2026-02-11 00:00 |
03:28:15.93 |
-31:06:32.1 |
HIP 16192 |
32.77 |
| 2026-02-11 12:00 |
03:28:15.84 |
-31:06:15.9 |
HIP 16192 |
32.50 |
| 2026-02-12 00:00 |
03:28:15.77 |
-31:05:59.6 |
HIP 16192 |
32.24 |
| 2026-02-12 12:00 |
03:28:15.72 |
-31:05:43.4 |
HIP 16192 |
31.97 |
| 2026-02-13 00:00 |
03:28:15.67 |
-31:05:27.0 |
HIP 16192 |
31.70 |
| 2026-02-13 12:00 |
03:28:15.64 |
-31:05:10.7 |
HIP 16192 |
31.43 |
| 2026-02-14 00:00 |
03:28:15.63 |
-31:04:54.3 |
HIP 16192 |
31.16 |
| 2026-02-14 12:00 |
03:28:15.62 |
-31:04:37.9 |
HIP 16192 |
30.89 |
| 2026-02-15 00:00 |
03:28:15.63 |
-31:04:21.5 |
HIP 16192 |
30.62 |
| 2026-02-15 12:00 |
03:28:15.66 |
-31:04:05.1 |
HIP 16192 |
30.35 |
| 2026-02-16 00:00 |
03:28:15.70 |
-31:03:48.6 |
HIP 16192 |
30.08 |
| 2026-02-16 12:00 |
03:28:15.75 |
-31:03:32.1 |
HIP 16192 |
29.80 |
| 2026-02-17 00:00 |
03:28:15.82 |
-31:03:15.6 |
HIP 16192 |
29.53 |
| 2026-02-17 12:00 |
03:28:15.90 |
-31:02:59.1 |
HIP 16192 |
29.25 |
| 2026-02-18 00:00 |
03:28:15.99 |
-31:02:42.5 |
HIP 16192 |
28.98 |
| 2026-02-18 12:00 |
03:28:16.10 |
-31:02:26.0 |
HIP 16192 |
28.70 |
| 2026-02-19 00:00 |
03:28:16.22 |
-31:02:09.4 |
HIP 16192 |
28.42 |
| 2026-02-19 12:00 |
03:28:16.35 |
-31:01:52.8 |
HIP 16192 |
28.15 |
| 2026-02-20 00:00 |
03:28:16.50 |
-31:01:36.2 |
HIP 16192 |
27.87 |
| 2026-02-20 12:00 |
03:28:16.66 |
-31:01:19.6 |
HIP 16192 |
27.59 |
| 2026-02-21 00:00 |
03:28:16.84 |
-31:01:03.0 |
HIP 16192 |
27.31 |
| 2026-02-21 12:00 |
03:28:17.03 |
-31:00:46.4 |
HIP 16192 |
27.03 |
| 2026-02-22 00:00 |
03:28:17.23 |
-31:00:29.8 |
HIP 16192 |
26.75 |
| 2026-02-22 12:00 |
03:28:17.45 |
-31:00:13.2 |
HIP 16192 |
26.47 |
| 2026-02-23 00:00 |
03:28:17.68 |
-30:59:56.6 |
HIP 16192 |
26.19 |
| 2026-02-23 12:00 |
03:28:17.92 |
-30:59:39.9 |
HIP 16192 |
25.91 |
| 2026-02-24 00:00 |
03:28:18.18 |
-30:59:23.3 |
HIP 16192 |
25.62 |