C/1969 P1 (Fujikawa)
| Parameter |
Value |
| Designation |
C/1969 P1 (Fujikawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1969-10-12T10:44:43.465920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1969-09-15.0000000 |
| e |
1.00000000 |
| q (au) |
0.773919 |
| a (au) |
- |
| i (deg) |
8.925201 |
| Ω (om, deg) |
192.395306 |
| ω (w, deg) |
299.019745 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (7.334 + 4.191\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.334 |
| n |
4.191 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
20:04:01.07 |
-11:49:29.2 |
HIP 98903 |
17.24 |
| 2026-02-03 12:00 |
20:04:02.51 |
-11:49:24.0 |
HIP 98903 |
16.98 |
| 2026-02-04 00:00 |
20:04:03.95 |
-11:49:18.8 |
HIP 98903 |
16.72 |
| 2026-02-04 12:00 |
20:04:05.38 |
-11:49:13.5 |
HIP 98903 |
16.46 |
| 2026-02-05 00:00 |
20:04:06.81 |
-11:49:08.3 |
HIP 98903 |
16.21 |
| 2026-02-05 12:00 |
20:04:08.23 |
-11:49:03.0 |
HIP 98903 |
15.97 |
| 2026-02-06 00:00 |
20:04:09.65 |
-11:48:57.8 |
HIP 98903 |
15.73 |
| 2026-02-06 12:00 |
20:04:11.07 |
-11:48:52.5 |
HIP 98903 |
15.50 |
| 2026-02-07 00:00 |
20:04:12.48 |
-11:48:47.2 |
HIP 98903 |
15.27 |
| 2026-02-07 12:00 |
20:04:13.89 |
-11:48:41.8 |
HIP 98903 |
15.04 |
| 2026-02-08 00:00 |
20:04:15.30 |
-11:48:36.5 |
HIP 98903 |
14.83 |
| 2026-02-08 12:00 |
20:04:16.70 |
-11:48:31.1 |
HIP 98903 |
14.62 |
| 2026-02-09 00:00 |
20:04:18.09 |
-11:48:25.8 |
HIP 98903 |
14.41 |
| 2026-02-09 12:00 |
20:04:19.49 |
-11:48:20.4 |
HIP 98903 |
14.22 |
| 2026-02-10 00:00 |
20:04:20.87 |
-11:48:15.0 |
HIP 98903 |
14.03 |
| 2026-02-10 12:00 |
20:04:22.25 |
-11:48:09.6 |
HIP 98903 |
13.85 |
| 2026-02-11 00:00 |
20:04:23.63 |
-11:48:04.2 |
HIP 98903 |
13.67 |
| 2026-02-11 12:00 |
20:04:25.01 |
-11:47:58.8 |
HIP 98903 |
13.50 |
| 2026-02-12 00:00 |
20:04:26.37 |
-11:47:53.3 |
HIP 98903 |
13.35 |
| 2026-02-12 12:00 |
20:04:27.74 |
-11:47:47.9 |
HIP 98903 |
13.20 |
| 2026-02-13 00:00 |
20:04:29.09 |
-11:47:42.4 |
HIP 98903 |
13.05 |
| 2026-02-13 12:00 |
20:04:30.45 |
-11:47:36.9 |
HIP 98903 |
12.92 |
| 2026-02-14 00:00 |
20:04:31.79 |
-11:47:31.4 |
HIP 98903 |
12.79 |
| 2026-02-14 12:00 |
20:04:33.13 |
-11:47:25.9 |
HIP 98903 |
12.68 |
| 2026-02-15 00:00 |
20:04:34.47 |
-11:47:20.4 |
HIP 98903 |
12.57 |
| 2026-02-15 12:00 |
20:04:35.80 |
-11:47:14.9 |
HIP 98903 |
12.47 |
| 2026-02-16 00:00 |
20:04:37.12 |
-11:47:09.4 |
HIP 98903 |
12.38 |
| 2026-02-16 12:00 |
20:04:38.44 |
-11:47:03.9 |
HIP 98903 |
12.30 |
| 2026-02-17 00:00 |
20:04:39.75 |
-11:46:58.3 |
HIP 98903 |
12.23 |
| 2026-02-17 12:00 |
20:04:41.06 |
-11:46:52.8 |
HIP 98903 |
12.17 |
| 2026-02-18 00:00 |
20:04:42.36 |
-11:46:47.3 |
HIP 98903 |
12.12 |
| 2026-02-18 12:00 |
20:04:43.65 |
-11:46:41.7 |
HIP 98910 |
11.98 |
| 2026-02-19 00:00 |
20:04:44.94 |
-11:46:36.1 |
HIP 98910 |
11.76 |
| 2026-02-19 12:00 |
20:04:46.22 |
-11:46:30.6 |
HIP 98910 |
11.55 |
| 2026-02-20 00:00 |
20:04:47.50 |
-11:46:25.0 |
HIP 98910 |
11.34 |
| 2026-02-20 12:00 |
20:04:48.76 |
-11:46:19.4 |
HIP 98910 |
11.13 |
| 2026-02-21 00:00 |
20:04:50.02 |
-11:46:13.9 |
HIP 98910 |
10.94 |
| 2026-02-21 12:00 |
20:04:51.28 |
-11:46:08.3 |
HIP 98910 |
10.75 |
| 2026-02-22 00:00 |
20:04:52.52 |
-11:46:02.7 |
HIP 98910 |
10.56 |
| 2026-02-22 12:00 |
20:04:53.76 |
-11:45:57.1 |
HIP 98910 |
10.39 |
| 2026-02-23 00:00 |
20:04:55.00 |
-11:45:51.5 |
HIP 98910 |
10.22 |
| 2026-02-23 12:00 |
20:04:56.22 |
-11:45:45.9 |
HIP 98910 |
10.06 |
| 2026-02-24 00:00 |
20:04:57.44 |
-11:45:40.3 |
HIP 98910 |
9.90 |