230P/LINEAR
| Parameter |
Value |
| Designation |
230P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-11-18T01:34:10.223040Z |
| Orbit solution date (soln_date, UTC) |
2025-11-13T12:12:40Z |
| Obs used |
1528 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-07-24T08:25:25.536000Z |
| Discovery magnitude (MPC) |
21.80 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-07-08.0000000 |
| e |
0.56311389 |
| q (au) |
1.485293 |
| a (au) |
3.399726 |
| i (deg) |
14.653033 |
| Ω (om, deg) |
112.396470 |
| ω (w, deg) |
308.912952 |
| M (ma, deg) |
339.077991 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.860 + 2.038\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.860 |
| n |
2.038 |
| gf |
0.876 |
| gb |
-0.500 |
| k |
0.937 |
| δ90 |
3.149 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:32:46.67 |
-15:45:09.5 |
HIP 85860 |
10.95 |
| 2026-02-03 12:00 |
17:33:07.05 |
-15:45:15.2 |
HIP 85860 |
12.15 |
| 2026-02-04 00:00 |
17:33:27.34 |
-15:45:20.4 |
HIP 85860 |
14.93 |
| 2026-02-04 12:00 |
17:33:47.54 |
-15:45:25.1 |
HIP 85860 |
18.58 |
| 2026-02-05 00:00 |
17:34:07.64 |
-15:45:29.5 |
HIP 85860 |
22.68 |
| 2026-02-05 12:00 |
17:34:27.64 |
-15:45:33.4 |
HIP 86104 |
20.08 |
| 2026-02-06 00:00 |
17:34:47.54 |
-15:45:36.9 |
HIP 86104 |
15.42 |
| 2026-02-06 12:00 |
17:35:07.35 |
-15:45:40.0 |
HIP 86104 |
10.89 |
| 2026-02-07 00:00 |
17:35:27.05 |
-15:45:42.7 |
HIP 86104 |
6.74 |
| 2026-02-07 12:00 |
17:35:46.65 |
-15:45:45.0 |
HIP 86104 |
4.15 |
| 2026-02-08 00:00 |
17:36:06.15 |
-15:45:46.8 |
HIP 86104 |
5.77 |
| 2026-02-08 12:00 |
17:36:25.55 |
-15:45:48.3 |
HIP 86104 |
9.64 |
| 2026-02-09 00:00 |
17:36:44.84 |
-15:45:49.3 |
HIP 86104 |
13.99 |
| 2026-02-09 12:00 |
17:37:04.03 |
-15:45:50.0 |
HIP 86266 |
13.92 |
| 2026-02-10 00:00 |
17:37:23.10 |
-15:45:50.2 |
HIP 86266 |
12.00 |
| 2026-02-10 12:00 |
17:37:42.07 |
-15:45:50.0 |
HIP 86266 |
11.66 |
| 2026-02-11 00:00 |
17:38:00.94 |
-15:45:49.5 |
HIP 86266 |
13.01 |
| 2026-02-11 12:00 |
17:38:19.69 |
-15:45:48.6 |
HIP 86412 |
15.54 |
| 2026-02-12 00:00 |
17:38:38.33 |
-15:45:47.2 |
HIP 86412 |
11.06 |
| 2026-02-12 12:00 |
17:38:56.86 |
-15:45:45.5 |
HIP 86412 |
6.60 |
| 2026-02-13 00:00 |
17:39:15.27 |
-15:45:43.4 |
HIP 86412 |
2.17 |
| 2026-02-13 12:00 |
17:39:33.57 |
-15:45:40.9 |
HIP 86412 |
2.24 |
| 2026-02-14 00:00 |
17:39:51.76 |
-15:45:38.0 |
HIP 86412 |
6.61 |
| 2026-02-14 12:00 |
17:40:09.83 |
-15:45:34.8 |
HIP 86412 |
10.96 |
| 2026-02-15 00:00 |
17:40:27.78 |
-15:45:31.2 |
HIP 86496 |
13.72 |
| 2026-02-15 12:00 |
17:40:45.61 |
-15:45:27.2 |
HIP 86496 |
13.96 |
| 2026-02-16 00:00 |
17:41:03.32 |
-15:45:22.9 |
HIP 86496 |
15.42 |
| 2026-02-16 12:00 |
17:41:20.91 |
-15:45:18.2 |
HIP 86496 |
17.79 |
| 2026-02-17 00:00 |
17:41:38.38 |
-15:45:13.1 |
HIP 86669 |
18.84 |
| 2026-02-17 12:00 |
17:41:55.73 |
-15:45:07.7 |
HIP 86683 |
15.77 |
| 2026-02-18 00:00 |
17:42:12.95 |
-15:45:01.9 |
HIP 86683 |
13.22 |
| 2026-02-18 12:00 |
17:42:30.04 |
-15:44:55.8 |
HIP 86683 |
11.64 |
| 2026-02-19 00:00 |
17:42:47.01 |
-15:44:49.3 |
HIP 86683 |
11.39 |
| 2026-02-19 12:00 |
17:43:03.85 |
-15:44:42.5 |
HIP 86683 |
12.52 |
| 2026-02-20 00:00 |
17:43:20.57 |
-15:44:35.4 |
HIP 86683 |
14.70 |
| 2026-02-20 12:00 |
17:43:37.15 |
-15:44:27.9 |
HIP 86683 |
17.52 |
| 2026-02-21 00:00 |
17:43:53.60 |
-15:44:20.1 |
HIP 86683 |
20.69 |
| 2026-02-21 12:00 |
17:44:09.92 |
-15:44:12.0 |
HIP 86683 |
24.08 |
| 2026-02-22 00:00 |
17:44:26.11 |
-15:44:03.5 |
HIP 86683 |
27.57 |
| 2026-02-22 12:00 |
17:44:42.17 |
-15:43:54.8 |
HIP 86683 |
31.13 |
| 2026-02-23 00:00 |
17:44:58.09 |
-15:43:45.7 |
HIP 86992 |
28.79 |
| 2026-02-23 12:00 |
17:45:13.87 |
-15:43:36.3 |
HIP 86992 |
25.87 |
| 2026-02-24 00:00 |
17:45:29.52 |
-15:43:26.6 |
HIP 86992 |
23.23 |