144P/Kushida
| 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
$$
M_a = (12.883 + 4.716\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.883 |
| n |
4.716 |
| 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 |
+5.0249 |
+0.349 |
| 2023-11-24 |
2024-01-25 |
+49.6233 |
-8.023 |
| 2024-01-26 |
2024-06-29 |
-8.0953 |
-0.977 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:20:46.08 |
-22:32:37.2 |
HIP 84869 |
18.29 |
| 2026-02-03 12:00 |
17:21:05.27 |
-22:32:46.8 |
HIP 84869 |
19.06 |
| 2026-02-04 00:00 |
17:21:24.33 |
-22:32:56.2 |
HIP 84869 |
20.77 |
| 2026-02-04 12:00 |
17:21:43.28 |
-22:33:05.2 |
HIP 85078 |
21.77 |
| 2026-02-05 00:00 |
17:22:02.10 |
-22:33:14.0 |
HIP 85078 |
17.55 |
| 2026-02-05 12:00 |
17:22:20.80 |
-22:33:22.4 |
HIP 85078 |
13.45 |
| 2026-02-06 00:00 |
17:22:39.38 |
-22:33:30.7 |
HIP 85078 |
9.55 |
| 2026-02-06 12:00 |
17:22:57.83 |
-22:33:38.6 |
HIP 85078 |
6.21 |
| 2026-02-07 00:00 |
17:23:16.16 |
-22:33:46.2 |
HIP 85078 |
4.72 |
| 2026-02-07 12:00 |
17:23:34.35 |
-22:33:53.6 |
HIP 85078 |
6.45 |
| 2026-02-08 00:00 |
17:23:52.42 |
-22:34:00.7 |
HIP 85078 |
9.78 |
| 2026-02-08 12:00 |
17:24:10.36 |
-22:34:07.5 |
HIP 85078 |
13.56 |
| 2026-02-09 00:00 |
17:24:28.17 |
-22:34:14.1 |
HIP 85176 |
13.85 |
| 2026-02-09 12:00 |
17:24:45.85 |
-22:34:20.4 |
HIP 85176 |
14.62 |
| 2026-02-10 00:00 |
17:25:03.39 |
-22:34:26.4 |
HIP 85176 |
16.38 |
| 2026-02-10 12:00 |
17:25:20.81 |
-22:34:32.2 |
HIP 85254 |
17.76 |
| 2026-02-11 00:00 |
17:25:38.08 |
-22:34:37.7 |
HIP 85254 |
18.34 |
| 2026-02-11 12:00 |
17:25:55.22 |
-22:34:42.9 |
HIP 85254 |
19.72 |
| 2026-02-12 00:00 |
17:26:12.23 |
-22:34:47.9 |
HIP 85254 |
21.72 |
| 2026-02-12 12:00 |
17:26:29.10 |
-22:34:52.7 |
HIP 85254 |
24.18 |
| 2026-02-13 00:00 |
17:26:45.83 |
-22:34:57.1 |
HIP 85526 |
26.72 |
| 2026-02-13 12:00 |
17:27:02.42 |
-22:35:01.4 |
HIP 85526 |
22.89 |
| 2026-02-14 00:00 |
17:27:18.87 |
-22:35:05.3 |
HIP 85526 |
19.09 |
| 2026-02-14 12:00 |
17:27:35.17 |
-22:35:09.1 |
HIP 85526 |
15.33 |
| 2026-02-15 00:00 |
17:27:51.34 |
-22:35:12.5 |
HIP 85526 |
11.60 |
| 2026-02-15 12:00 |
17:28:07.36 |
-22:35:15.8 |
HIP 85526 |
7.91 |
| 2026-02-16 00:00 |
17:28:23.23 |
-22:35:18.8 |
HIP 85526 |
4.25 |
| 2026-02-16 12:00 |
17:28:38.96 |
-22:35:21.5 |
HIP 85526 |
0.77 |
| 2026-02-17 00:00 |
17:28:54.55 |
-22:35:24.0 |
HIP 85526 |
3.04 |
| 2026-02-17 12:00 |
17:29:09.98 |
-22:35:26.3 |
HIP 85526 |
6.58 |
| 2026-02-18 00:00 |
17:29:25.27 |
-22:35:28.4 |
HIP 85526 |
10.10 |
| 2026-02-18 12:00 |
17:29:40.40 |
-22:35:30.2 |
HIP 85526 |
13.59 |
| 2026-02-19 00:00 |
17:29:55.39 |
-22:35:31.8 |
HIP 85526 |
17.05 |
| 2026-02-19 12:00 |
17:30:10.22 |
-22:35:33.1 |
HIP 85526 |
20.47 |
| 2026-02-20 00:00 |
17:30:24.90 |
-22:35:34.2 |
HIP 85642 |
21.92 |
| 2026-02-20 12:00 |
17:30:39.43 |
-22:35:35.1 |
HIP 85642 |
22.79 |
| 2026-02-21 00:00 |
17:30:53.80 |
-22:35:35.8 |
HIP 85642 |
24.09 |
| 2026-02-21 12:00 |
17:31:08.02 |
-22:35:36.3 |
HIP 85642 |
25.73 |
| 2026-02-22 00:00 |
17:31:22.07 |
-22:35:36.5 |
HIP 85804 |
25.65 |
| 2026-02-22 12:00 |
17:31:35.98 |
-22:35:36.6 |
HIP 85804 |
24.84 |
| 2026-02-23 00:00 |
17:31:49.72 |
-22:35:36.4 |
HIP 85804 |
24.42 |
| 2026-02-23 12:00 |
17:32:03.31 |
-22:35:36.0 |
HIP 85804 |
24.41 |
| 2026-02-24 00:00 |
17:32:16.73 |
-22:35:35.4 |
HIP 85804 |
24.80 |