| 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 |
-0.500 |
| 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) |
| 2026-06-01 00:00 |
20:05:32.72 |
-11:34:33.9 |
HIP 98910 |
6.83 |
| 2026-06-01 12:00 |
20:05:31.80 |
-11:34:34.2 |
HIP 98910 |
6.61 |
| 2026-06-02 00:00 |
20:05:30.87 |
-11:34:34.6 |
HIP 98910 |
6.39 |
| 2026-06-02 12:00 |
20:05:29.93 |
-11:34:35.1 |
HIP 98910 |
6.16 |
| 2026-06-03 00:00 |
20:05:28.98 |
-11:34:35.6 |
HIP 98910 |
5.93 |
| 2026-06-03 12:00 |
20:05:28.02 |
-11:34:36.1 |
HIP 98910 |
5.70 |
| 2026-06-04 00:00 |
20:05:27.06 |
-11:34:36.7 |
HIP 98910 |
5.47 |
| 2026-06-04 12:00 |
20:05:26.08 |
-11:34:37.3 |
HIP 98910 |
5.24 |
| 2026-06-05 00:00 |
20:05:25.09 |
-11:34:38.0 |
HIP 98910 |
5.00 |
| 2026-06-05 12:00 |
20:05:24.10 |
-11:34:38.7 |
HIP 98910 |
4.76 |
| 2026-06-06 00:00 |
20:05:23.10 |
-11:34:39.5 |
HIP 98910 |
4.52 |
| 2026-06-06 12:00 |
20:05:22.09 |
-11:34:40.3 |
HIP 98910 |
4.28 |
| 2026-06-07 00:00 |
20:05:21.07 |
-11:34:41.2 |
HIP 98910 |
4.04 |
| 2026-06-07 12:00 |
20:05:20.04 |
-11:34:42.1 |
HIP 98910 |
3.80 |
| 2026-06-08 00:00 |
20:05:19.00 |
-11:34:43.0 |
HIP 98910 |
3.55 |
| 2026-06-08 12:00 |
20:05:17.95 |
-11:34:44.0 |
HIP 98910 |
3.31 |
| 2026-06-09 00:00 |
20:05:16.90 |
-11:34:45.1 |
HIP 98910 |
3.06 |
| 2026-06-09 12:00 |
20:05:15.84 |
-11:34:46.2 |
HIP 98910 |
2.82 |
| 2026-06-10 00:00 |
20:05:14.77 |
-11:34:47.3 |
HIP 98910 |
2.57 |
| 2026-06-10 12:00 |
20:05:13.69 |
-11:34:48.5 |
HIP 98910 |
2.33 |
| 2026-06-11 00:00 |
20:05:12.60 |
-11:34:49.7 |
HIP 98910 |
2.09 |
| 2026-06-11 12:00 |
20:05:11.51 |
-11:34:51.0 |
HIP 98910 |
1.86 |
| 2026-06-12 00:00 |
20:05:10.41 |
-11:34:52.3 |
HIP 98910 |
1.64 |
| 2026-06-12 12:00 |
20:05:09.30 |
-11:34:53.7 |
HIP 98910 |
1.43 |
| 2026-06-13 00:00 |
20:05:08.18 |
-11:34:55.1 |
HIP 98910 |
1.24 |
| 2026-06-13 12:00 |
20:05:07.05 |
-11:34:56.5 |
HIP 98910 |
1.10 |
| 2026-06-14 00:00 |
20:05:05.92 |
-11:34:58.0 |
HIP 98910 |
1.00 |
| 2026-06-14 12:00 |
20:05:04.78 |
-11:34:59.6 |
HIP 98910 |
0.98 |
| 2026-06-15 00:00 |
20:05:03.63 |
-11:35:01.2 |
HIP 98910 |
1.04 |
| 2026-06-15 12:00 |
20:05:02.48 |
-11:35:02.8 |
HIP 98910 |
1.16 |
| 2026-06-16 00:00 |
20:05:01.31 |
-11:35:04.5 |
HIP 98910 |
1.34 |
| 2026-06-16 12:00 |
20:05:00.14 |
-11:35:06.2 |
HIP 98910 |
1.55 |
| 2026-06-17 00:00 |
20:04:58.97 |
-11:35:08.0 |
HIP 98910 |
1.78 |
| 2026-06-17 12:00 |
20:04:57.78 |
-11:35:09.8 |
HIP 98910 |
2.03 |
| 2026-06-18 00:00 |
20:04:56.59 |
-11:35:11.7 |
HIP 98910 |
2.29 |
| 2026-06-18 12:00 |
20:04:55.40 |
-11:35:13.6 |
HIP 98910 |
2.56 |
| 2026-06-19 00:00 |
20:04:54.19 |
-11:35:15.5 |
HIP 98910 |
2.84 |
| 2026-06-19 12:00 |
20:04:52.98 |
-11:35:17.5 |
HIP 98910 |
3.12 |
| 2026-06-20 00:00 |
20:04:51.77 |
-11:35:19.5 |
HIP 98910 |
3.40 |
| 2026-06-20 12:00 |
20:04:50.54 |
-11:35:21.6 |
HIP 98910 |
3.69 |
| 2026-06-21 00:00 |
20:04:49.31 |
-11:35:23.7 |
HIP 98910 |
3.98 |
| 2026-06-21 12:00 |
20:04:48.08 |
-11:35:25.9 |
HIP 98910 |
4.28 |
| 2026-06-22 00:00 |
20:04:46.84 |
-11:35:28.1 |
HIP 98910 |
4.58 |