| 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
$$
M_a = (8.535 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.535 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
-3.783 |
| 2023-05-14 |
2023-10-17 |
+15.2071 |
-5.277 |
| 2023-10-17 |
2024-11-21 |
+3.9569 |
-1.564 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:52:39.89 |
+16:48:18.6 |
HIP 32958 |
16.19 |
| 2026-09-20 12:00 |
06:52:53.20 |
+16:47:03.8 |
HIP 32958 |
17.82 |
| 2026-09-21 00:00 |
06:53:06.35 |
+16:45:48.8 |
HIP 32958 |
19.88 |
| 2026-09-21 12:00 |
06:53:19.34 |
+16:44:33.8 |
HIP 32958 |
22.22 |
| 2026-09-22 00:00 |
06:53:32.17 |
+16:43:18.7 |
HIP 33230 |
24.51 |
| 2026-09-22 12:00 |
06:53:44.85 |
+16:42:03.5 |
HIP 33230 |
23.09 |
| 2026-09-23 00:00 |
06:53:57.36 |
+16:40:48.2 |
HIP 33230 |
22.10 |
| 2026-09-23 12:00 |
06:54:09.71 |
+16:39:32.9 |
HIP 33230 |
21.57 |
| 2026-09-24 00:00 |
06:54:21.91 |
+16:38:17.4 |
HIP 33230 |
21.53 |
| 2026-09-24 12:00 |
06:54:33.93 |
+16:37:01.9 |
HIP 33230 |
21.96 |
| 2026-09-25 00:00 |
06:54:45.80 |
+16:35:46.3 |
HIP 33230 |
22.83 |
| 2026-09-25 12:00 |
06:54:57.50 |
+16:34:30.6 |
HIP 33230 |
24.07 |
| 2026-09-26 00:00 |
06:55:09.04 |
+16:33:14.9 |
HIP 33230 |
25.61 |
| 2026-09-26 12:00 |
06:55:20.41 |
+16:31:59.1 |
HIP 33230 |
27.39 |
| 2026-09-27 00:00 |
06:55:31.61 |
+16:30:43.3 |
HIP 33230 |
29.36 |
| 2026-09-27 12:00 |
06:55:42.64 |
+16:29:27.4 |
HIP 33230 |
31.48 |
| 2026-09-28 00:00 |
06:55:53.51 |
+16:28:11.5 |
HIP 33230 |
33.70 |
| 2026-09-28 12:00 |
06:56:04.20 |
+16:26:55.5 |
HIP 33469 |
32.02 |
| 2026-09-29 00:00 |
06:56:14.73 |
+16:25:39.5 |
HIP 33469 |
29.49 |
| 2026-09-29 12:00 |
06:56:25.08 |
+16:24:23.5 |
HIP 33469 |
27.04 |
| 2026-09-30 00:00 |
06:56:35.26 |
+16:23:07.4 |
HIP 33469 |
24.68 |
| 2026-09-30 12:00 |
06:56:45.26 |
+16:21:51.3 |
HIP 33469 |
22.42 |
| 2026-10-01 00:00 |
06:56:55.09 |
+16:20:35.2 |
HIP 33469 |
20.30 |
| 2026-10-01 12:00 |
06:57:04.74 |
+16:19:19.0 |
HIP 33469 |
18.33 |
| 2026-10-02 00:00 |
06:57:14.22 |
+16:18:02.9 |
HIP 33469 |
16.56 |
| 2026-10-02 12:00 |
06:57:23.51 |
+16:16:46.7 |
HIP 33469 |
15.04 |
| 2026-10-03 00:00 |
06:57:32.63 |
+16:15:30.5 |
HIP 33469 |
13.82 |
| 2026-10-03 12:00 |
06:57:41.57 |
+16:14:14.4 |
HIP 33469 |
12.98 |
| 2026-10-04 00:00 |
06:57:50.32 |
+16:12:58.2 |
HIP 33469 |
12.56 |
| 2026-10-04 12:00 |
06:57:58.90 |
+16:11:42.1 |
HIP 33469 |
12.59 |
| 2026-10-05 00:00 |
06:58:07.28 |
+16:10:25.9 |
HIP 33469 |
13.05 |
| 2026-10-05 12:00 |
06:58:15.49 |
+16:09:09.8 |
HIP 33618 |
13.74 |
| 2026-10-06 00:00 |
06:58:23.50 |
+16:07:53.7 |
HIP 33618 |
11.44 |
| 2026-10-06 12:00 |
06:58:31.33 |
+16:06:37.6 |
HIP 33618 |
9.18 |
| 2026-10-07 00:00 |
06:58:38.98 |
+16:05:21.6 |
HIP 33618 |
6.98 |
| 2026-10-07 12:00 |
06:58:46.43 |
+16:04:05.6 |
HIP 33618 |
4.84 |
| 2026-10-08 00:00 |
06:58:53.69 |
+16:02:49.7 |
HIP 33618 |
2.83 |
| 2026-10-08 12:00 |
06:59:00.76 |
+16:01:33.8 |
HIP 33618 |
1.41 |
| 2026-10-09 00:00 |
06:59:07.64 |
+16:00:18.0 |
HIP 33618 |
2.21 |
| 2026-10-09 12:00 |
06:59:14.33 |
+15:59:02.2 |
HIP 33618 |
4.03 |
| 2026-10-10 00:00 |
06:59:20.82 |
+15:57:46.5 |
HIP 33618 |
5.97 |
| 2026-10-10 12:00 |
06:59:27.12 |
+15:56:30.8 |
HIP 33618 |
7.91 |
| 2026-10-11 00:00 |
06:59:33.22 |
+15:55:15.3 |
HIP 33618 |
9.82 |