| 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) |
| 2026-03-26 00:00 |
02:29:07.25 |
+09:20:26.9 |
HIP 11603 |
15.17 |
| 2026-03-26 12:00 |
02:29:47.20 |
+09:23:36.6 |
HIP 11603 |
10.73 |
| 2026-03-27 00:00 |
02:30:27.30 |
+09:26:46.4 |
HIP 11603 |
14.67 |
| 2026-03-27 12:00 |
02:31:07.55 |
+09:29:56.3 |
HIP 11603 |
23.08 |
| 2026-03-28 00:00 |
02:31:47.97 |
+09:33:06.3 |
HIP 11603 |
32.70 |
| 2026-03-28 12:00 |
02:32:28.53 |
+09:36:16.3 |
HIP 11864 |
33.20 |
| 2026-03-29 00:00 |
02:33:09.25 |
+09:39:26.4 |
HIP 11864 |
28.81 |
| 2026-03-29 12:00 |
02:33:50.13 |
+09:42:36.6 |
HIP 11864 |
27.92 |
| 2026-03-30 00:00 |
02:34:31.16 |
+09:45:46.8 |
HIP 12076 |
27.77 |
| 2026-03-30 12:00 |
02:35:12.34 |
+09:48:57.1 |
HIP 12076 |
19.81 |
| 2026-03-31 00:00 |
02:35:53.68 |
+09:52:07.4 |
HIP 12076 |
15.49 |
| 2026-03-31 12:00 |
02:36:35.17 |
+09:55:17.7 |
HIP 12076 |
17.76 |
| 2026-04-01 00:00 |
02:37:16.82 |
+09:58:28.0 |
HIP 12227 |
24.85 |
| 2026-04-01 12:00 |
02:37:58.62 |
+10:01:38.3 |
HIP 12227 |
29.11 |
| 2026-04-02 00:00 |
02:38:40.58 |
+10:04:48.7 |
HIP 12354 |
33.89 |
| 2026-04-02 12:00 |
02:39:22.69 |
+10:07:59.0 |
HIP 12497 |
24.58 |
| 2026-04-03 00:00 |
02:40:04.95 |
+10:11:09.3 |
HIP 12497 |
14.37 |
| 2026-04-03 12:00 |
02:40:47.37 |
+10:14:19.6 |
HIP 12497 |
6.71 |
| 2026-04-04 00:00 |
02:41:29.94 |
+10:17:29.9 |
HIP 12497 |
11.06 |
| 2026-04-04 12:00 |
02:42:12.66 |
+10:20:40.1 |
HIP 12599 |
12.41 |
| 2026-04-05 00:00 |
02:42:55.54 |
+10:23:50.3 |
HIP 12599 |
16.25 |
| 2026-04-05 12:00 |
02:43:38.57 |
+10:27:00.5 |
HIP 12647 |
24.47 |
| 2026-04-06 00:00 |
02:44:21.76 |
+10:30:10.5 |
HIP 12828 |
24.83 |
| 2026-04-06 12:00 |
02:45:05.10 |
+10:33:20.5 |
HIP 12877 |
16.62 |
| 2026-04-07 00:00 |
02:45:48.59 |
+10:36:30.5 |
HIP 12877 |
12.65 |
| 2026-04-07 12:00 |
02:46:32.24 |
+10:39:40.3 |
HIP 12877 |
17.13 |
| 2026-04-08 00:00 |
02:47:16.05 |
+10:42:50.1 |
HIP 12877 |
26.04 |
| 2026-04-08 12:00 |
02:48:00.00 |
+10:45:59.7 |
HIP 13042 |
32.69 |
| 2026-04-09 00:00 |
02:48:44.11 |
+10:49:09.3 |
HIP 13042 |
39.07 |
| 2026-04-09 12:00 |
02:49:28.38 |
+10:52:18.7 |
HIP 13342 |
35.73 |
| 2026-04-10 00:00 |
02:50:12.80 |
+10:55:28.0 |
HIP 13342 |
27.75 |
| 2026-04-10 12:00 |
02:50:57.38 |
+10:58:37.2 |
HIP 13342 |
22.83 |
| 2026-04-11 00:00 |
02:51:42.10 |
+11:01:46.2 |
HIP 13364 |
17.07 |
| 2026-04-11 12:00 |
02:52:26.99 |
+11:04:55.1 |
HIP 13364 |
15.26 |
| 2026-04-12 00:00 |
02:53:12.03 |
+11:08:03.8 |
HIP 13538 |
19.88 |
| 2026-04-12 12:00 |
02:53:57.22 |
+11:11:12.3 |
HIP 13538 |
9.37 |
| 2026-04-13 00:00 |
02:54:42.57 |
+11:14:20.7 |
HIP 13538 |
6.80 |
| 2026-04-13 12:00 |
02:55:28.07 |
+11:17:28.8 |
HIP 13586 |
13.68 |
| 2026-04-14 00:00 |
02:56:13.73 |
+11:20:36.8 |
HIP 13586 |
19.82 |
| 2026-04-14 12:00 |
02:56:59.54 |
+11:23:44.6 |
HIP 13586 |
29.51 |
| 2026-04-15 00:00 |
02:57:45.50 |
+11:26:52.1 |
HIP 13759 |
39.74 |
| 2026-04-15 12:00 |
02:58:31.62 |
+11:29:59.4 |
HIP 13921 |
32.46 |
| 2026-04-16 00:00 |
02:59:17.90 |
+11:33:06.5 |
HIP 13966 |
26.77 |