237P/LINEAR
| Parameter |
Value |
| Designation |
237P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-05-14T13:55:38.369280Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T10:11:19Z |
| Obs used |
2268 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
21.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-12-09.0000000 |
| e |
0.43436596 |
| q (au) |
1.986663 |
| a (au) |
3.512276 |
| i (deg) |
14.014625 |
| Ω (om, deg) |
245.378783 |
| ω (w, deg) |
25.235831 |
| M (ma, deg) |
281.901559 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.540 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.540 |
| n |
6.000 |
| 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 |
| 2022-02-04 |
2023-05-14 |
+9.5015 |
-3.788 |
| 2023-05-14 |
2023-10-17 |
+15.0031 |
-5.204 |
| 2023-10-17 |
2024-11-21 |
+3.9800 |
-1.580 |
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 |
04:18:31.20 |
+18:16:07.5 |
HIP 20056 |
7.02 |
| 2026-02-03 12:00 |
04:18:30.05 |
+18:15:50.9 |
HIP 20056 |
6.73 |
| 2026-02-04 00:00 |
04:18:29.12 |
+18:15:34.9 |
HIP 20056 |
6.50 |
| 2026-02-04 12:00 |
04:18:28.42 |
+18:15:19.6 |
HIP 20056 |
6.33 |
| 2026-02-05 00:00 |
04:18:27.94 |
+18:15:05.1 |
HIP 20056 |
6.22 |
| 2026-02-05 12:00 |
04:18:27.69 |
+18:14:51.1 |
HIP 20056 |
6.18 |
| 2026-02-06 00:00 |
04:18:27.66 |
+18:14:37.9 |
HIP 20056 |
6.20 |
| 2026-02-06 12:00 |
04:18:27.85 |
+18:14:25.2 |
HIP 20056 |
6.27 |
| 2026-02-07 00:00 |
04:18:28.27 |
+18:14:13.3 |
HIP 20056 |
6.40 |
| 2026-02-07 12:00 |
04:18:28.91 |
+18:14:02.0 |
HIP 20056 |
6.59 |
| 2026-02-08 00:00 |
04:18:29.76 |
+18:13:51.4 |
HIP 20056 |
6.83 |
| 2026-02-08 12:00 |
04:18:30.84 |
+18:13:41.4 |
HIP 20056 |
7.12 |
| 2026-02-09 00:00 |
04:18:32.15 |
+18:13:32.0 |
HIP 20056 |
7.45 |
| 2026-02-09 12:00 |
04:18:33.67 |
+18:13:23.3 |
HIP 20056 |
7.84 |
| 2026-02-10 00:00 |
04:18:35.41 |
+18:13:15.3 |
HIP 20056 |
8.27 |
| 2026-02-10 12:00 |
04:18:37.36 |
+18:13:07.8 |
HIP 20056 |
8.75 |
| 2026-02-11 00:00 |
04:18:39.54 |
+18:13:01.0 |
HIP 20056 |
9.28 |
| 2026-02-11 12:00 |
04:18:41.94 |
+18:12:54.9 |
HIP 20056 |
9.86 |
| 2026-02-12 00:00 |
04:18:44.55 |
+18:12:49.3 |
HIP 20056 |
10.48 |
| 2026-02-12 12:00 |
04:18:47.37 |
+18:12:44.4 |
HIP 20056 |
11.15 |
| 2026-02-13 00:00 |
04:18:50.42 |
+18:12:40.1 |
HIP 20056 |
11.87 |
| 2026-02-13 12:00 |
04:18:53.68 |
+18:12:36.4 |
HIP 20056 |
12.64 |
| 2026-02-14 00:00 |
04:18:57.15 |
+18:12:33.3 |
HIP 20056 |
13.46 |
| 2026-02-14 12:00 |
04:19:00.84 |
+18:12:30.8 |
HIP 20056 |
14.32 |
| 2026-02-15 00:00 |
04:19:04.74 |
+18:12:28.9 |
HIP 20056 |
15.24 |
| 2026-02-15 12:00 |
04:19:08.85 |
+18:12:27.5 |
HIP 20056 |
16.20 |
| 2026-02-16 00:00 |
04:19:13.17 |
+18:12:26.8 |
HIP 20056 |
17.21 |
| 2026-02-16 12:00 |
04:19:17.70 |
+18:12:26.7 |
HIP 20056 |
18.27 |
| 2026-02-17 00:00 |
04:19:22.45 |
+18:12:27.1 |
HIP 20056 |
19.38 |
| 2026-02-17 12:00 |
04:19:27.40 |
+18:12:28.1 |
HIP 20056 |
20.55 |
| 2026-02-18 00:00 |
04:19:32.56 |
+18:12:29.7 |
HIP 20056 |
21.76 |
| 2026-02-18 12:00 |
04:19:37.93 |
+18:12:31.8 |
HIP 20056 |
23.01 |
| 2026-02-19 00:00 |
04:19:43.50 |
+18:12:34.5 |
HIP 20336 |
24.09 |
| 2026-02-19 12:00 |
04:19:49.28 |
+18:12:37.7 |
HIP 20336 |
22.72 |
| 2026-02-20 00:00 |
04:19:55.27 |
+18:12:41.5 |
HIP 20336 |
21.31 |
| 2026-02-20 12:00 |
04:20:01.45 |
+18:12:45.8 |
HIP 20336 |
19.85 |
| 2026-02-21 00:00 |
04:20:07.84 |
+18:12:50.7 |
HIP 20336 |
18.34 |
| 2026-02-21 12:00 |
04:20:14.44 |
+18:12:56.1 |
HIP 20336 |
16.78 |
| 2026-02-22 00:00 |
04:20:21.23 |
+18:13:02.0 |
HIP 20336 |
15.18 |
| 2026-02-22 12:00 |
04:20:28.22 |
+18:13:08.4 |
HIP 20336 |
13.53 |
| 2026-02-23 00:00 |
04:20:35.41 |
+18:13:15.3 |
HIP 20336 |
11.84 |
| 2026-02-23 12:00 |
04:20:42.80 |
+18:13:22.7 |
HIP 20336 |
10.11 |
| 2026-02-24 00:00 |
04:20:50.38 |
+18:13:30.6 |
HIP 20336 |
8.34 |