| Parameter |
Value |
| Designation |
144P/Kushida |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-01-25T19:11:47.238720Z |
| Orbit solution date (soln_date, UTC) |
2024-12-30T09:07:42Z |
| Obs used |
3111 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
18.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-08-12T00:16:24.096000Z |
| Discovery magnitude (MPC) |
21.40 V |
| Discovery observatory (MPC) |
A77 · Observatoire Chante-Perdrix, Dauban |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-01-18.0000000 |
| e |
0.63510624 |
| q (au) |
1.397336 |
| a (au) |
3.829432 |
| i (deg) |
3.930393 |
| Ω (om, deg) |
242.979419 |
| ω (w, deg) |
216.345483 |
| M (ma, deg) |
310.968153 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.854 + 4.742\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.854 |
| n |
4.742 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-06-22 |
2023-11-24 |
+5.1076 |
+0.335 |
| 2023-11-24 |
2024-01-25 |
+49.8144 |
-8.102 |
| 2024-01-26 |
2024-06-29 |
-7.8618 |
-1.021 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:29:05.99 |
-22:05:00.0 |
HIP 85526 |
30.41 |
| 2026-05-12 12:00 |
17:28:50.22 |
-22:04:37.7 |
HIP 85526 |
30.32 |
| 2026-05-13 00:00 |
17:28:34.32 |
-22:04:15.2 |
HIP 85526 |
30.67 |
| 2026-05-13 12:00 |
17:28:18.28 |
-22:03:52.6 |
HIP 85526 |
31.47 |
| 2026-05-14 00:00 |
17:28:02.11 |
-22:03:29.7 |
HIP 85526 |
32.68 |
| 2026-05-14 12:00 |
17:27:45.80 |
-22:03:06.8 |
HIP 85526 |
34.29 |
| 2026-05-15 00:00 |
17:27:29.36 |
-22:02:43.7 |
HIP 85247 |
33.18 |
| 2026-05-15 12:00 |
17:27:12.80 |
-22:02:20.4 |
HIP 85247 |
29.38 |
| 2026-05-16 00:00 |
17:26:56.11 |
-22:01:56.9 |
HIP 85247 |
25.58 |
| 2026-05-16 12:00 |
17:26:39.30 |
-22:01:33.3 |
HIP 85247 |
21.78 |
| 2026-05-17 00:00 |
17:26:22.36 |
-22:01:09.6 |
HIP 85247 |
18.01 |
| 2026-05-17 12:00 |
17:26:05.31 |
-22:00:45.7 |
HIP 85247 |
14.30 |
| 2026-05-18 00:00 |
17:25:48.14 |
-22:00:21.6 |
HIP 85247 |
10.75 |
| 2026-05-18 12:00 |
17:25:30.86 |
-21:59:57.4 |
HIP 85247 |
7.66 |
| 2026-05-19 00:00 |
17:25:13.47 |
-21:59:33.0 |
HIP 85247 |
5.84 |
| 2026-05-19 12:00 |
17:24:55.97 |
-21:59:08.5 |
HIP 85247 |
6.52 |
| 2026-05-20 00:00 |
17:24:38.36 |
-21:58:43.8 |
HIP 85247 |
9.20 |
| 2026-05-20 12:00 |
17:24:20.65 |
-21:58:19.0 |
HIP 85247 |
12.68 |
| 2026-05-21 00:00 |
17:24:02.84 |
-21:57:54.0 |
HIP 85247 |
16.49 |
| 2026-05-21 12:00 |
17:23:44.94 |
-21:57:28.9 |
HIP 85121 |
19.04 |
| 2026-05-22 00:00 |
17:23:26.93 |
-21:57:03.6 |
HIP 85121 |
19.25 |
| 2026-05-22 12:00 |
17:23:08.84 |
-21:56:38.2 |
HIP 85121 |
20.35 |
| 2026-05-23 00:00 |
17:22:50.66 |
-21:56:12.6 |
HIP 85121 |
22.23 |
| 2026-05-23 12:00 |
17:22:32.39 |
-21:55:46.9 |
HIP 85121 |
24.71 |
| 2026-05-24 00:00 |
17:22:14.03 |
-21:55:21.0 |
HIP 85121 |
27.64 |
| 2026-05-24 12:00 |
17:21:55.60 |
-21:54:55.0 |
HIP 84869 |
25.49 |
| 2026-05-25 00:00 |
17:21:37.08 |
-21:54:28.9 |
HIP 84869 |
23.32 |
| 2026-05-25 12:00 |
17:21:18.49 |
-21:54:02.6 |
HIP 84869 |
21.78 |
| 2026-05-26 00:00 |
17:20:59.83 |
-21:53:36.2 |
HIP 84869 |
21.05 |
| 2026-05-26 12:00 |
17:20:41.09 |
-21:53:09.6 |
HIP 84869 |
21.19 |
| 2026-05-27 00:00 |
17:20:22.29 |
-21:52:42.9 |
HIP 84798 |
21.60 |
| 2026-05-27 12:00 |
17:20:03.42 |
-21:52:16.0 |
HIP 84798 |
20.46 |
| 2026-05-28 00:00 |
17:19:44.48 |
-21:51:49.0 |
HIP 84798 |
20.24 |
| 2026-05-28 12:00 |
17:19:25.49 |
-21:51:21.9 |
HIP 84798 |
20.97 |
| 2026-05-29 00:00 |
17:19:06.44 |
-21:50:54.7 |
HIP 84798 |
22.57 |
| 2026-05-29 12:00 |
17:18:47.33 |
-21:50:27.3 |
HIP 84798 |
24.89 |
| 2026-05-30 00:00 |
17:18:28.18 |
-21:49:59.8 |
HIP 84798 |
27.74 |
| 2026-05-30 12:00 |
17:18:08.97 |
-21:49:32.2 |
HIP 84491 |
24.45 |
| 2026-05-31 00:00 |
17:17:49.71 |
-21:49:04.4 |
HIP 84491 |
20.05 |
| 2026-05-31 12:00 |
17:17:30.41 |
-21:48:36.6 |
HIP 84491 |
15.69 |
| 2026-06-01 00:00 |
17:17:11.07 |
-21:48:08.6 |
HIP 84491 |
11.43 |
| 2026-06-01 12:00 |
17:16:51.69 |
-21:47:40.5 |
HIP 84491 |
7.47 |
| 2026-06-02 00:00 |
17:16:32.28 |
-21:47:12.2 |
HIP 84491 |
4.67 |