| 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) |
| 2026-07-29 00:00 |
22:30:05.92 |
-13:41:19.5 |
HIP 110978 |
15.01 |
| 2026-07-29 12:00 |
22:29:52.09 |
-13:43:11.2 |
HIP 110978 |
11.69 |
| 2026-07-30 00:00 |
22:29:38.11 |
-13:45:03.5 |
HIP 110978 |
8.77 |
| 2026-07-30 12:00 |
22:29:23.98 |
-13:46:56.5 |
HIP 110978 |
6.87 |
| 2026-07-31 00:00 |
22:29:09.70 |
-13:48:50.1 |
HIP 110978 |
6.94 |
| 2026-07-31 12:00 |
22:28:55.27 |
-13:50:44.3 |
HIP 110941 |
4.33 |
| 2026-08-01 00:00 |
22:28:40.69 |
-13:52:39.0 |
HIP 110941 |
4.61 |
| 2026-08-01 12:00 |
22:28:25.97 |
-13:54:34.4 |
HIP 110941 |
7.52 |
| 2026-08-02 00:00 |
22:28:11.11 |
-13:56:30.3 |
HIP 110941 |
11.19 |
| 2026-08-02 12:00 |
22:27:56.11 |
-13:58:26.7 |
HIP 110941 |
15.12 |
| 2026-08-03 00:00 |
22:27:40.96 |
-14:00:23.6 |
HIP 110941 |
19.16 |
| 2026-08-03 12:00 |
22:27:25.69 |
-14:02:21.1 |
HIP 110767 |
15.28 |
| 2026-08-04 00:00 |
22:27:10.27 |
-14:04:19.0 |
HIP 110767 |
11.15 |
| 2026-08-04 12:00 |
22:26:54.73 |
-14:06:17.4 |
HIP 110767 |
7.10 |
| 2026-08-05 00:00 |
22:26:39.05 |
-14:08:16.3 |
HIP 110767 |
3.55 |
| 2026-08-05 12:00 |
22:26:23.25 |
-14:10:15.6 |
HIP 110767 |
3.40 |
| 2026-08-06 00:00 |
22:26:07.32 |
-14:12:15.3 |
HIP 110767 |
6.94 |
| 2026-08-06 12:00 |
22:25:51.26 |
-14:14:15.4 |
HIP 110767 |
11.10 |
| 2026-08-07 00:00 |
22:25:35.08 |
-14:16:15.9 |
HIP 110767 |
15.40 |
| 2026-08-07 12:00 |
22:25:18.79 |
-14:18:16.8 |
HIP 110663 |
18.73 |
| 2026-08-08 00:00 |
22:25:02.37 |
-14:20:18.0 |
HIP 110663 |
20.41 |
| 2026-08-08 12:00 |
22:24:45.84 |
-14:22:19.5 |
HIP 110663 |
22.87 |
| 2026-08-09 00:00 |
22:24:29.20 |
-14:24:21.4 |
HIP 110507 |
22.81 |
| 2026-08-09 12:00 |
22:24:12.45 |
-14:26:23.5 |
HIP 110507 |
20.72 |
| 2026-08-10 00:00 |
22:23:55.58 |
-14:28:25.9 |
HIP 110507 |
19.47 |
| 2026-08-10 12:00 |
22:23:38.62 |
-14:30:28.5 |
HIP 110507 |
19.24 |
| 2026-08-11 00:00 |
22:23:21.55 |
-14:32:31.4 |
HIP 110507 |
20.09 |
| 2026-08-11 12:00 |
22:23:04.39 |
-14:34:34.5 |
HIP 110507 |
21.91 |
| 2026-08-12 00:00 |
22:22:47.12 |
-14:36:37.8 |
HIP 110388 |
20.07 |
| 2026-08-12 12:00 |
22:22:29.77 |
-14:38:41.2 |
HIP 110388 |
17.69 |
| 2026-08-13 00:00 |
22:22:12.32 |
-14:40:44.8 |
HIP 110388 |
16.32 |
| 2026-08-13 12:00 |
22:21:54.78 |
-14:42:48.5 |
HIP 110388 |
16.24 |
| 2026-08-14 00:00 |
22:21:37.16 |
-14:44:52.3 |
HIP 110350 |
13.46 |
| 2026-08-14 12:00 |
22:21:19.46 |
-14:46:56.2 |
HIP 110350 |
9.32 |
| 2026-08-15 00:00 |
22:21:01.68 |
-14:49:00.1 |
HIP 110350 |
6.12 |
| 2026-08-15 12:00 |
22:20:43.82 |
-14:51:04.1 |
HIP 110350 |
5.81 |
| 2026-08-16 00:00 |
22:20:25.89 |
-14:53:08.1 |
HIP 110350 |
8.72 |
| 2026-08-16 12:00 |
22:20:07.89 |
-14:55:12.1 |
HIP 110350 |
12.84 |
| 2026-08-17 00:00 |
22:19:49.82 |
-14:57:16.1 |
HIP 110350 |
17.34 |
| 2026-08-17 12:00 |
22:19:31.69 |
-14:59:20.0 |
HIP 110131 |
14.79 |
| 2026-08-18 00:00 |
22:19:13.50 |
-15:01:23.9 |
HIP 110131 |
10.34 |
| 2026-08-18 12:00 |
22:18:55.25 |
-15:03:27.7 |
HIP 110131 |
6.50 |
| 2026-08-19 00:00 |
22:18:36.94 |
-15:05:31.4 |
HIP 110131 |
4.97 |