| Parameter |
Value |
| Designation |
70P/Kojima |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-10-20T16:00:34.519680Z |
| Orbit solution date (soln_date, UTC) |
2026-05-06T05:40:47Z |
| Obs used |
2097 |
| NEO |
- |
| M1 |
12.500 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-05-14.0000000 |
| e |
0.45391285 |
| q (au) |
2.006566 |
| a (au) |
3.674443 |
| i (deg) |
6.600119 |
| Ω (om, deg) |
119.270141 |
| ω (w, deg) |
1.953402 |
| M (ma, deg) |
28.732632 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.474 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.474 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.842 |
| 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 |
21:59:34.17 |
-16:59:54.9 |
HIP 108560 |
18.83 |
| 2026-09-20 12:00 |
21:59:18.99 |
-17:01:14.3 |
HIP 108560 |
17.47 |
| 2026-09-21 00:00 |
21:59:03.96 |
-17:02:32.6 |
HIP 108560 |
16.92 |
| 2026-09-21 12:00 |
21:58:49.07 |
-17:03:49.8 |
HIP 108560 |
17.21 |
| 2026-09-22 00:00 |
21:58:34.33 |
-17:05:05.8 |
HIP 108560 |
18.29 |
| 2026-09-22 12:00 |
21:58:19.74 |
-17:06:20.7 |
HIP 108560 |
20.00 |
| 2026-09-23 00:00 |
21:58:05.31 |
-17:07:34.4 |
HIP 108560 |
22.18 |
| 2026-09-23 12:00 |
21:57:51.04 |
-17:08:47.0 |
HIP 108560 |
24.68 |
| 2026-09-24 00:00 |
21:57:36.92 |
-17:09:58.4 |
HIP 108560 |
27.41 |
| 2026-09-24 12:00 |
21:57:22.97 |
-17:11:08.6 |
HIP 108560 |
30.27 |
| 2026-09-25 00:00 |
21:57:09.17 |
-17:12:17.7 |
HIP 108560 |
33.23 |
| 2026-09-25 12:00 |
21:56:55.55 |
-17:13:25.6 |
HIP 108419 |
36.11 |
| 2026-09-26 00:00 |
21:56:42.09 |
-17:14:32.2 |
HIP 108419 |
36.40 |
| 2026-09-26 12:00 |
21:56:28.79 |
-17:15:37.7 |
HIP 108095 |
35.13 |
| 2026-09-27 00:00 |
21:56:15.67 |
-17:16:42.0 |
HIP 108095 |
32.26 |
| 2026-09-27 12:00 |
21:56:02.72 |
-17:17:45.1 |
HIP 108095 |
29.52 |
| 2026-09-28 00:00 |
21:55:49.95 |
-17:18:47.0 |
HIP 108095 |
26.93 |
| 2026-09-28 12:00 |
21:55:37.35 |
-17:19:47.7 |
HIP 108095 |
24.52 |
| 2026-09-29 00:00 |
21:55:24.93 |
-17:20:47.2 |
HIP 108108 |
22.22 |
| 2026-09-29 12:00 |
21:55:12.68 |
-17:21:45.4 |
HIP 108108 |
19.36 |
| 2026-09-30 00:00 |
21:55:00.62 |
-17:22:42.5 |
HIP 108108 |
16.64 |
| 2026-09-30 12:00 |
21:54:48.74 |
-17:23:38.3 |
HIP 108108 |
14.07 |
| 2026-10-01 00:00 |
21:54:37.05 |
-17:24:32.9 |
HIP 108108 |
11.75 |
| 2026-10-01 12:00 |
21:54:25.54 |
-17:25:26.2 |
HIP 108108 |
9.80 |
| 2026-10-02 00:00 |
21:54:14.22 |
-17:26:18.3 |
HIP 108108 |
8.43 |
| 2026-10-02 12:00 |
21:54:03.09 |
-17:27:09.2 |
HIP 108108 |
7.88 |
| 2026-10-03 00:00 |
21:53:52.15 |
-17:27:58.8 |
HIP 108108 |
8.29 |
| 2026-10-03 12:00 |
21:53:41.40 |
-17:28:47.2 |
HIP 108108 |
9.47 |
| 2026-10-04 00:00 |
21:53:30.85 |
-17:29:34.4 |
HIP 108108 |
11.16 |
| 2026-10-04 12:00 |
21:53:20.49 |
-17:30:20.3 |
HIP 108108 |
13.12 |
| 2026-10-05 00:00 |
21:53:10.33 |
-17:31:04.9 |
HIP 108108 |
15.23 |
| 2026-10-05 12:00 |
21:53:00.36 |
-17:31:48.3 |
HIP 108108 |
17.41 |
| 2026-10-06 00:00 |
21:52:50.60 |
-17:32:30.4 |
HIP 108108 |
19.61 |
| 2026-10-06 12:00 |
21:52:41.04 |
-17:33:11.2 |
HIP 108108 |
21.82 |
| 2026-10-07 00:00 |
21:52:31.69 |
-17:33:50.8 |
HIP 108108 |
24.01 |
| 2026-10-07 12:00 |
21:52:22.53 |
-17:34:29.2 |
HIP 108108 |
26.18 |
| 2026-10-08 00:00 |
21:52:13.59 |
-17:35:06.2 |
HIP 108108 |
28.31 |
| 2026-10-08 12:00 |
21:52:04.85 |
-17:35:42.0 |
HIP 108108 |
30.40 |
| 2026-10-09 00:00 |
21:51:56.32 |
-17:36:16.5 |
HIP 107824 |
30.65 |
| 2026-10-09 12:00 |
21:51:47.99 |
-17:36:49.7 |
HIP 107824 |
29.05 |
| 2026-10-10 00:00 |
21:51:39.88 |
-17:37:21.7 |
HIP 107824 |
27.55 |
| 2026-10-10 12:00 |
21:51:31.98 |
-17:37:52.4 |
HIP 107824 |
26.17 |
| 2026-10-11 00:00 |
21:51:24.29 |
-17:38:21.8 |
HIP 107824 |
24.89 |