| 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) |
| 2026-09-20 00:00 |
20:01:03.28 |
-11:49:06.2 |
HIP 98554 |
2.77 |
| 2026-09-20 12:00 |
20:01:02.57 |
-11:49:11.2 |
HIP 98554 |
2.83 |
| 2026-09-21 00:00 |
20:01:01.87 |
-11:49:16.1 |
HIP 98554 |
2.91 |
| 2026-09-21 12:00 |
20:01:01.18 |
-11:49:21.1 |
HIP 98554 |
2.99 |
| 2026-09-22 00:00 |
20:01:00.50 |
-11:49:26.0 |
HIP 98554 |
3.09 |
| 2026-09-22 12:00 |
20:00:59.84 |
-11:49:30.9 |
HIP 98554 |
3.18 |
| 2026-09-23 00:00 |
20:00:59.18 |
-11:49:35.8 |
HIP 98554 |
3.29 |
| 2026-09-23 12:00 |
20:00:58.54 |
-11:49:40.6 |
HIP 98554 |
3.39 |
| 2026-09-24 00:00 |
20:00:57.90 |
-11:49:45.5 |
HIP 98554 |
3.50 |
| 2026-09-24 12:00 |
20:00:57.28 |
-11:49:50.3 |
HIP 98554 |
3.62 |
| 2026-09-25 00:00 |
20:00:56.67 |
-11:49:55.1 |
HIP 98554 |
3.73 |
| 2026-09-25 12:00 |
20:00:56.07 |
-11:49:59.9 |
HIP 98554 |
3.85 |
| 2026-09-26 00:00 |
20:00:55.48 |
-11:50:04.6 |
HIP 98554 |
3.97 |
| 2026-09-26 12:00 |
20:00:54.91 |
-11:50:09.3 |
HIP 98554 |
4.08 |
| 2026-09-27 00:00 |
20:00:54.34 |
-11:50:14.1 |
HIP 98554 |
4.20 |
| 2026-09-27 12:00 |
20:00:53.79 |
-11:50:18.7 |
HIP 98554 |
4.32 |
| 2026-09-28 00:00 |
20:00:53.25 |
-11:50:23.4 |
HIP 98554 |
4.44 |
| 2026-09-28 12:00 |
20:00:52.71 |
-11:50:28.0 |
HIP 98554 |
4.55 |
| 2026-09-29 00:00 |
20:00:52.19 |
-11:50:32.7 |
HIP 98554 |
4.67 |
| 2026-09-29 12:00 |
20:00:51.69 |
-11:50:37.3 |
HIP 98554 |
4.79 |
| 2026-09-30 00:00 |
20:00:51.19 |
-11:50:41.8 |
HIP 98554 |
4.90 |
| 2026-09-30 12:00 |
20:00:50.71 |
-11:50:46.4 |
HIP 98554 |
5.01 |
| 2026-10-01 00:00 |
20:00:50.23 |
-11:50:50.9 |
HIP 98554 |
5.12 |
| 2026-10-01 12:00 |
20:00:49.77 |
-11:50:55.4 |
HIP 98554 |
5.23 |
| 2026-10-02 00:00 |
20:00:49.32 |
-11:50:59.8 |
HIP 98554 |
5.34 |
| 2026-10-02 12:00 |
20:00:48.88 |
-11:51:04.3 |
HIP 98554 |
5.45 |
| 2026-10-03 00:00 |
20:00:48.46 |
-11:51:08.7 |
HIP 98554 |
5.55 |
| 2026-10-03 12:00 |
20:00:48.05 |
-11:51:13.1 |
HIP 98554 |
5.66 |
| 2026-10-04 00:00 |
20:00:47.64 |
-11:51:17.4 |
HIP 98554 |
5.76 |
| 2026-10-04 12:00 |
20:00:47.25 |
-11:51:21.8 |
HIP 98554 |
5.85 |
| 2026-10-05 00:00 |
20:00:46.88 |
-11:51:26.1 |
HIP 98554 |
5.95 |
| 2026-10-05 12:00 |
20:00:46.51 |
-11:51:30.4 |
HIP 98554 |
6.04 |
| 2026-10-06 00:00 |
20:00:46.16 |
-11:51:34.6 |
HIP 98554 |
6.14 |
| 2026-10-06 12:00 |
20:00:45.82 |
-11:51:38.8 |
HIP 98554 |
6.23 |
| 2026-10-07 00:00 |
20:00:45.49 |
-11:51:43.0 |
HIP 98554 |
6.31 |
| 2026-10-07 12:00 |
20:00:45.17 |
-11:51:47.2 |
HIP 98554 |
6.40 |
| 2026-10-08 00:00 |
20:00:44.86 |
-11:51:51.3 |
HIP 98554 |
6.48 |
| 2026-10-08 12:00 |
20:00:44.57 |
-11:51:55.4 |
HIP 98554 |
6.56 |
| 2026-10-09 00:00 |
20:00:44.29 |
-11:51:59.5 |
HIP 98554 |
6.63 |
| 2026-10-09 12:00 |
20:00:44.03 |
-11:52:03.5 |
HIP 98554 |
6.71 |
| 2026-10-10 00:00 |
20:00:43.77 |
-11:52:07.5 |
HIP 98554 |
6.78 |
| 2026-10-10 12:00 |
20:00:43.53 |
-11:52:11.5 |
HIP 98554 |
6.85 |
| 2026-10-11 00:00 |
20:00:43.30 |
-11:52:15.4 |
HIP 98554 |
6.92 |