| 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) |
| 2026-05-12 00:00 |
03:42:58.04 |
+14:05:59.4 |
HIP 17480 |
26.50 |
| 2026-05-12 12:00 |
03:43:52.66 |
+14:08:40.9 |
HIP 17480 |
15.52 |
| 2026-05-13 00:00 |
03:44:47.45 |
+14:11:21.6 |
HIP 17480 |
12.02 |
| 2026-05-13 12:00 |
03:45:42.40 |
+14:14:01.5 |
HIP 17480 |
20.40 |
| 2026-05-14 00:00 |
03:46:37.52 |
+14:16:40.7 |
HIP 17726 |
16.93 |
| 2026-05-14 12:00 |
03:47:32.80 |
+14:19:19.1 |
HIP 17726 |
3.62 |
| 2026-05-15 00:00 |
03:48:28.26 |
+14:21:56.8 |
HIP 17726 |
10.63 |
| 2026-05-15 12:00 |
03:49:23.88 |
+14:24:33.6 |
HIP 17726 |
24.27 |
| 2026-05-16 00:00 |
03:50:19.67 |
+14:27:09.6 |
HIP 17836 |
37.07 |
| 2026-05-16 12:00 |
03:51:15.63 |
+14:29:44.9 |
HIP 18158 |
25.11 |
| 2026-05-17 00:00 |
03:52:11.75 |
+14:32:19.2 |
HIP 18158 |
14.14 |
| 2026-05-17 12:00 |
03:53:08.05 |
+14:34:52.8 |
HIP 18158 |
12.30 |
| 2026-05-18 00:00 |
03:54:04.51 |
+14:37:25.5 |
HIP 18158 |
22.10 |
| 2026-05-18 12:00 |
03:55:01.14 |
+14:39:57.3 |
HIP 18158 |
34.84 |
| 2026-05-19 00:00 |
03:55:57.94 |
+14:42:28.3 |
HIP 18228 |
42.33 |
| 2026-05-19 12:00 |
03:56:54.91 |
+14:44:58.3 |
HIP 18576 |
31.55 |
| 2026-05-20 00:00 |
03:57:52.05 |
+14:47:27.5 |
HIP 18576 |
20.55 |
| 2026-05-20 12:00 |
03:58:49.36 |
+14:49:55.8 |
HIP 18576 |
15.62 |
| 2026-05-21 00:00 |
03:59:46.84 |
+14:52:23.1 |
HIP 18576 |
21.51 |
| 2026-05-21 12:00 |
04:00:44.49 |
+14:54:49.5 |
HIP 18843 |
27.90 |
| 2026-05-22 00:00 |
04:01:42.31 |
+14:57:15.0 |
HIP 18864 |
15.04 |
| 2026-05-22 12:00 |
04:02:40.30 |
+14:59:39.5 |
HIP 18864 |
4.09 |
| 2026-05-23 00:00 |
04:03:38.47 |
+15:02:03.1 |
HIP 18998 |
8.35 |
| 2026-05-23 12:00 |
04:04:36.80 |
+15:04:25.7 |
HIP 18998 |
6.40 |
| 2026-05-24 00:00 |
04:05:35.31 |
+15:06:47.3 |
HIP 18998 |
20.54 |
| 2026-05-24 12:00 |
04:06:33.99 |
+15:09:07.9 |
HIP 19207 |
12.78 |
| 2026-05-25 00:00 |
04:07:32.84 |
+15:11:27.6 |
HIP 19261 |
2.76 |
| 2026-05-25 12:00 |
04:08:31.87 |
+15:13:46.2 |
HIP 19261 |
12.70 |
| 2026-05-26 00:00 |
04:09:31.07 |
+15:16:03.7 |
HIP 19499 |
16.95 |
| 2026-05-26 12:00 |
04:10:30.45 |
+15:18:20.3 |
HIP 19499 |
4.83 |
| 2026-05-27 00:00 |
04:11:30.01 |
+15:20:35.8 |
HIP 19499 |
13.44 |
| 2026-05-27 12:00 |
04:12:29.74 |
+15:22:50.2 |
HIP 19548 |
24.12 |
| 2026-05-28 00:00 |
04:13:29.64 |
+15:25:03.6 |
HIP 19822 |
29.21 |
| 2026-05-28 12:00 |
04:14:29.73 |
+15:27:15.9 |
HIP 19822 |
18.60 |
| 2026-05-29 00:00 |
04:15:29.99 |
+15:29:27.1 |
HIP 19877 |
6.67 |
| 2026-05-29 12:00 |
04:16:30.44 |
+15:31:37.2 |
HIP 19877 |
13.07 |
| 2026-05-30 00:00 |
04:17:31.06 |
+15:33:46.2 |
HIP 19877 |
27.07 |
| 2026-05-30 12:00 |
04:18:31.86 |
+15:35:54.0 |
HIP 20205 |
18.30 |
| 2026-05-31 00:00 |
04:19:32.85 |
+15:38:00.8 |
HIP 20205 |
3.55 |
| 2026-05-31 12:00 |
04:20:34.01 |
+15:40:06.4 |
HIP 20205 |
11.45 |
| 2026-06-01 00:00 |
04:21:35.36 |
+15:42:10.8 |
HIP 20389 |
7.49 |
| 2026-06-01 12:00 |
04:22:36.89 |
+15:44:14.0 |
HIP 20389 |
9.59 |
| 2026-06-02 00:00 |
04:23:38.61 |
+15:46:16.1 |
HIP 20485 |
3.26 |