| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
06:43:47.43 |
+16:26:06.6 |
HIP 32224 |
21.01 |
| 2026-07-29 12:00 |
06:45:14.80 |
+16:24:08.3 |
HIP 32413 |
12.97 |
| 2026-07-30 00:00 |
06:46:42.44 |
+16:22:06.9 |
HIP 32413 |
11.40 |
| 2026-07-30 12:00 |
06:48:10.34 |
+16:20:02.2 |
HIP 32753 |
25.14 |
| 2026-07-31 00:00 |
06:49:38.51 |
+16:17:54.3 |
HIP 32753 |
6.34 |
| 2026-07-31 12:00 |
06:51:06.94 |
+16:15:43.2 |
HIP 32789 |
17.68 |
| 2026-08-01 00:00 |
06:52:35.65 |
+16:13:28.9 |
HIP 32958 |
25.51 |
| 2026-08-01 12:00 |
06:54:04.62 |
+16:11:11.2 |
HIP 33205 |
22.55 |
| 2026-08-02 00:00 |
06:55:33.87 |
+16:08:50.3 |
HIP 33205 |
22.66 |
| 2026-08-02 12:00 |
06:57:03.39 |
+16:06:26.0 |
HIP 33469 |
7.29 |
| 2026-08-03 00:00 |
06:58:33.17 |
+16:03:58.5 |
HIP 33618 |
7.88 |
| 2026-08-03 12:00 |
07:00:03.23 |
+16:01:27.5 |
HIP 33715 |
4.46 |
| 2026-08-04 00:00 |
07:01:33.56 |
+15:58:53.2 |
HIP 33818 |
6.15 |
| 2026-08-04 12:00 |
07:03:04.17 |
+15:56:15.4 |
HIP 33941 |
6.79 |
| 2026-08-05 00:00 |
07:04:35.05 |
+15:53:34.3 |
HIP 34057 |
20.12 |
| 2026-08-05 12:00 |
07:06:06.21 |
+15:50:49.6 |
HIP 34440 |
33.05 |
| 2026-08-06 00:00 |
07:07:37.64 |
+15:48:01.6 |
HIP 34440 |
13.24 |
| 2026-08-06 12:00 |
07:09:09.34 |
+15:45:10.0 |
HIP 34496 |
14.94 |
| 2026-08-07 00:00 |
07:10:41.32 |
+15:42:14.9 |
HIP 34705 |
23.90 |
| 2026-08-07 12:00 |
07:12:13.58 |
+15:39:16.3 |
HIP 34865 |
20.78 |
| 2026-08-08 00:00 |
07:13:46.12 |
+15:36:14.1 |
HIP 34865 |
20.68 |
| 2026-08-08 12:00 |
07:15:18.93 |
+15:33:08.4 |
HIP 35071 |
22.77 |
| 2026-08-09 00:00 |
07:16:52.02 |
+15:29:59.1 |
HIP 35362 |
20.19 |
| 2026-08-09 12:00 |
07:18:25.38 |
+15:26:46.2 |
HIP 35362 |
2.60 |
| 2026-08-10 00:00 |
07:19:59.03 |
+15:23:29.6 |
HIP 35548 |
15.03 |
| 2026-08-10 12:00 |
07:21:32.95 |
+15:20:09.4 |
HIP 35796 |
21.37 |
| 2026-08-11 00:00 |
07:23:07.15 |
+15:16:45.6 |
HIP 35796 |
4.97 |
| 2026-08-11 12:00 |
07:24:41.63 |
+15:13:18.0 |
HIP 35933 |
18.05 |
| 2026-08-12 00:00 |
07:26:16.39 |
+15:09:46.8 |
HIP 36212 |
19.14 |
| 2026-08-12 12:00 |
07:27:51.43 |
+15:06:11.9 |
HIP 36340 |
13.48 |
| 2026-08-13 00:00 |
07:29:26.74 |
+15:02:33.2 |
HIP 36340 |
10.35 |
| 2026-08-13 12:00 |
07:31:02.33 |
+14:58:50.8 |
HIP 36564 |
16.61 |
| 2026-08-14 00:00 |
07:32:38.21 |
+14:55:04.6 |
HIP 36822 |
26.42 |
| 2026-08-14 12:00 |
07:34:14.36 |
+14:51:14.6 |
HIP 36822 |
6.19 |
| 2026-08-15 00:00 |
07:35:50.79 |
+14:47:20.8 |
HIP 37066 |
18.05 |
| 2026-08-15 12:00 |
07:37:27.50 |
+14:43:23.2 |
HIP 37066 |
11.81 |
| 2026-08-16 00:00 |
07:39:04.50 |
+14:39:21.8 |
HIP 37282 |
12.18 |
| 2026-08-16 12:00 |
07:40:41.77 |
+14:35:16.6 |
HIP 37282 |
21.08 |
| 2026-08-17 00:00 |
07:42:19.32 |
+14:31:07.5 |
HIP 37521 |
19.02 |
| 2026-08-17 12:00 |
07:43:57.15 |
+14:26:54.5 |
HIP 37708 |
16.79 |
| 2026-08-18 00:00 |
07:45:35.27 |
+14:22:37.6 |
HIP 37836 |
13.60 |
| 2026-08-18 12:00 |
07:47:13.66 |
+14:18:16.9 |
HIP 37967 |
25.34 |
| 2026-08-19 00:00 |
07:48:52.34 |
+14:13:52.2 |
HIP 38202 |
12.29 |