| 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) |
| 2026-07-29 00:00 |
20:03:05.01 |
-11:39:53.5 |
HIP 98910 |
29.74 |
| 2026-07-29 12:00 |
20:03:03.59 |
-11:39:58.3 |
HIP 98554 |
29.68 |
| 2026-07-30 00:00 |
20:03:02.18 |
-11:40:03.0 |
HIP 98554 |
29.33 |
| 2026-07-30 12:00 |
20:03:00.77 |
-11:40:07.8 |
HIP 98554 |
28.98 |
| 2026-07-31 00:00 |
20:02:59.36 |
-11:40:12.5 |
HIP 98554 |
28.63 |
| 2026-07-31 12:00 |
20:02:57.95 |
-11:40:17.4 |
HIP 98554 |
28.28 |
| 2026-08-01 00:00 |
20:02:56.55 |
-11:40:22.2 |
HIP 98554 |
27.93 |
| 2026-08-01 12:00 |
20:02:55.15 |
-11:40:27.0 |
HIP 98554 |
27.58 |
| 2026-08-02 00:00 |
20:02:53.75 |
-11:40:31.9 |
HIP 98554 |
27.24 |
| 2026-08-02 12:00 |
20:02:52.35 |
-11:40:36.8 |
HIP 98554 |
26.89 |
| 2026-08-03 00:00 |
20:02:50.95 |
-11:40:41.7 |
HIP 98554 |
26.54 |
| 2026-08-03 12:00 |
20:02:49.56 |
-11:40:46.6 |
HIP 98554 |
26.20 |
| 2026-08-04 00:00 |
20:02:48.17 |
-11:40:51.6 |
HIP 98554 |
25.85 |
| 2026-08-04 12:00 |
20:02:46.78 |
-11:40:56.5 |
HIP 98554 |
25.51 |
| 2026-08-05 00:00 |
20:02:45.40 |
-11:41:01.5 |
HIP 98554 |
25.16 |
| 2026-08-05 12:00 |
20:02:44.02 |
-11:41:06.5 |
HIP 98554 |
24.82 |
| 2026-08-06 00:00 |
20:02:42.64 |
-11:41:11.5 |
HIP 98554 |
24.48 |
| 2026-08-06 12:00 |
20:02:41.26 |
-11:41:16.6 |
HIP 98554 |
24.14 |
| 2026-08-07 00:00 |
20:02:39.89 |
-11:41:21.6 |
HIP 98554 |
23.80 |
| 2026-08-07 12:00 |
20:02:38.52 |
-11:41:26.7 |
HIP 98554 |
23.45 |
| 2026-08-08 00:00 |
20:02:37.15 |
-11:41:31.8 |
HIP 98554 |
23.12 |
| 2026-08-08 12:00 |
20:02:35.79 |
-11:41:36.9 |
HIP 98554 |
22.78 |
| 2026-08-09 00:00 |
20:02:34.43 |
-11:41:42.0 |
HIP 98554 |
22.44 |
| 2026-08-09 12:00 |
20:02:33.08 |
-11:41:47.1 |
HIP 98554 |
22.10 |
| 2026-08-10 00:00 |
20:02:31.73 |
-11:41:52.3 |
HIP 98554 |
21.77 |
| 2026-08-10 12:00 |
20:02:30.38 |
-11:41:57.4 |
HIP 98554 |
21.43 |
| 2026-08-11 00:00 |
20:02:29.04 |
-11:42:02.6 |
HIP 98554 |
21.10 |
| 2026-08-11 12:00 |
20:02:27.70 |
-11:42:07.8 |
HIP 98554 |
20.76 |
| 2026-08-12 00:00 |
20:02:26.37 |
-11:42:13.0 |
HIP 98554 |
20.43 |
| 2026-08-12 12:00 |
20:02:25.04 |
-11:42:18.2 |
HIP 98554 |
20.10 |
| 2026-08-13 00:00 |
20:02:23.71 |
-11:42:23.5 |
HIP 98554 |
19.77 |
| 2026-08-13 12:00 |
20:02:22.39 |
-11:42:28.7 |
HIP 98554 |
19.44 |
| 2026-08-14 00:00 |
20:02:21.08 |
-11:42:33.9 |
HIP 98554 |
19.12 |
| 2026-08-14 12:00 |
20:02:19.77 |
-11:42:39.2 |
HIP 98554 |
18.79 |
| 2026-08-15 00:00 |
20:02:18.46 |
-11:42:44.5 |
HIP 98554 |
18.46 |
| 2026-08-15 12:00 |
20:02:17.16 |
-11:42:49.8 |
HIP 98554 |
18.14 |
| 2026-08-16 00:00 |
20:02:15.86 |
-11:42:55.0 |
HIP 98554 |
17.82 |
| 2026-08-16 12:00 |
20:02:14.57 |
-11:43:00.3 |
HIP 98554 |
17.50 |
| 2026-08-17 00:00 |
20:02:13.29 |
-11:43:05.7 |
HIP 98554 |
17.18 |
| 2026-08-17 12:00 |
20:02:12.01 |
-11:43:11.0 |
HIP 98554 |
16.86 |
| 2026-08-18 00:00 |
20:02:10.73 |
-11:43:16.3 |
HIP 98554 |
16.54 |
| 2026-08-18 12:00 |
20:02:09.47 |
-11:43:21.6 |
HIP 98554 |
16.23 |
| 2026-08-19 00:00 |
20:02:08.20 |
-11:43:27.0 |
HIP 98554 |
15.91 |