252P/LINEAR
| Parameter |
Value |
| Designation |
252P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-03-15T06:19:30.322560Z |
| Orbit solution date (soln_date, UTC) |
2021-09-07T14:01:25Z |
| Obs used |
122 |
| NEO |
Yes |
| M1 |
16.400 |
| K1 |
16.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-06-13.0000000 |
| e |
0.67308502 |
| q (au) |
0.996046 |
| a (au) |
3.046804 |
| i (deg) |
10.422196 |
| Ω (om, deg) |
190.948496 |
| ω (w, deg) |
343.310475 |
| M (ma, deg) |
16.630534 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.317 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.317 |
| n |
6.000 |
| gf |
0.999 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
01:36:25.95 |
+04:35:07.4 |
HIP 7476 |
16.42 |
| 2026-02-03 12:00 |
01:36:46.96 |
+04:37:16.8 |
HIP 7476 |
19.88 |
| 2026-02-04 00:00 |
01:37:08.20 |
+04:39:27.3 |
HIP 7476 |
24.24 |
| 2026-02-04 12:00 |
01:37:29.66 |
+04:41:39.0 |
HIP 7476 |
29.12 |
| 2026-02-05 00:00 |
01:37:51.35 |
+04:43:51.7 |
HIP 7476 |
34.33 |
| 2026-02-05 12:00 |
01:38:13.27 |
+04:46:05.5 |
HIP 7476 |
39.77 |
| 2026-02-06 00:00 |
01:38:35.40 |
+04:48:20.4 |
HIP 7476 |
45.38 |
| 2026-02-06 12:00 |
01:38:57.76 |
+04:50:36.3 |
HIP 7701 |
44.18 |
| 2026-02-07 00:00 |
01:39:20.34 |
+04:52:53.3 |
HIP 7701 |
41.94 |
| 2026-02-07 12:00 |
01:39:43.14 |
+04:55:11.3 |
HIP 7701 |
40.49 |
| 2026-02-08 00:00 |
01:40:06.17 |
+04:57:30.3 |
HIP 7884 |
37.45 |
| 2026-02-08 12:00 |
01:40:29.40 |
+04:59:50.4 |
HIP 7884 |
32.61 |
| 2026-02-09 00:00 |
01:40:52.86 |
+05:02:11.4 |
HIP 7884 |
28.29 |
| 2026-02-09 12:00 |
01:41:16.54 |
+05:04:33.5 |
HIP 7884 |
24.81 |
| 2026-02-10 00:00 |
01:41:40.43 |
+05:06:56.5 |
HIP 7884 |
22.60 |
| 2026-02-10 12:00 |
01:42:04.53 |
+05:09:20.5 |
HIP 7884 |
22.11 |
| 2026-02-11 00:00 |
01:42:28.85 |
+05:11:45.5 |
HIP 7884 |
23.49 |
| 2026-02-11 12:00 |
01:42:53.38 |
+05:14:11.5 |
HIP 8055 |
22.96 |
| 2026-02-12 00:00 |
01:43:18.12 |
+05:16:38.3 |
HIP 8055 |
23.90 |
| 2026-02-12 12:00 |
01:43:43.08 |
+05:19:06.1 |
HIP 8064 |
25.65 |
| 2026-02-13 00:00 |
01:44:08.25 |
+05:21:34.9 |
HIP 8064 |
24.30 |
| 2026-02-13 12:00 |
01:44:33.62 |
+05:24:04.5 |
HIP 8064 |
24.79 |
| 2026-02-14 00:00 |
01:44:59.20 |
+05:26:35.1 |
HIP 8064 |
27.06 |
| 2026-02-14 12:00 |
01:45:24.99 |
+05:29:06.5 |
HIP 8064 |
30.76 |
| 2026-02-15 00:00 |
01:45:50.99 |
+05:31:38.8 |
HIP 8267 |
27.39 |
| 2026-02-15 12:00 |
01:46:17.20 |
+05:34:12.0 |
HIP 8267 |
23.25 |
| 2026-02-16 00:00 |
01:46:43.60 |
+05:36:46.0 |
HIP 8267 |
20.70 |
| 2026-02-16 12:00 |
01:47:10.22 |
+05:39:20.9 |
HIP 8267 |
20.41 |
| 2026-02-17 00:00 |
01:47:37.03 |
+05:41:56.6 |
HIP 8267 |
22.51 |
| 2026-02-17 12:00 |
01:48:04.05 |
+05:44:33.2 |
HIP 8494 |
22.54 |
| 2026-02-18 00:00 |
01:48:31.26 |
+05:47:10.5 |
HIP 8494 |
17.53 |
| 2026-02-18 12:00 |
01:48:58.68 |
+05:49:48.7 |
HIP 8494 |
14.53 |
| 2026-02-19 00:00 |
01:49:26.30 |
+05:52:27.6 |
HIP 8494 |
14.91 |
| 2026-02-19 12:00 |
01:49:54.11 |
+05:55:07.3 |
HIP 8597 |
16.38 |
| 2026-02-20 00:00 |
01:50:22.13 |
+05:57:47.8 |
HIP 8597 |
8.93 |
| 2026-02-20 12:00 |
01:50:50.33 |
+06:00:29.0 |
HIP 8597 |
1.52 |
| 2026-02-21 00:00 |
01:51:18.74 |
+06:03:11.0 |
HIP 8597 |
6.19 |
| 2026-02-21 12:00 |
01:51:47.33 |
+06:05:53.7 |
HIP 8597 |
13.78 |
| 2026-02-22 00:00 |
01:52:16.12 |
+06:08:37.1 |
HIP 8648 |
20.10 |
| 2026-02-22 12:00 |
01:52:45.10 |
+06:11:21.2 |
HIP 8648 |
26.89 |
| 2026-02-23 00:00 |
01:53:14.27 |
+06:14:06.1 |
HIP 8951 |
33.13 |
| 2026-02-23 12:00 |
01:53:43.64 |
+06:16:51.6 |
HIP 8951 |
25.33 |
| 2026-02-24 00:00 |
01:54:13.19 |
+06:19:37.8 |
HIP 8951 |
17.49 |