| Parameter |
Value |
| Designation |
P/2014 L2 (NEOWISE) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-07-15T10:00:57.260160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:54Z |
| Obs used |
1130 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
18.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-09-05.0000000 |
| e |
0.64676281 |
| q (au) |
2.234542 |
| a (au) |
6.325896 |
| i (deg) |
5.184412 |
| Ω (om, deg) |
149.405843 |
| ω (w, deg) |
182.777950 |
| M (ma, deg) |
3.195397 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.912 |
| n |
6.000 |
| gf |
1.000 |
| 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 |
11:44:50.37 |
+04:46:39.2 |
HIP 57490 |
33.45 |
| 2026-05-12 12:00 |
11:44:45.44 |
+04:47:05.8 |
HIP 57490 |
34.56 |
| 2026-05-13 00:00 |
11:44:40.61 |
+04:47:31.6 |
HIP 57490 |
35.67 |
| 2026-05-13 12:00 |
11:44:35.88 |
+04:47:56.8 |
HIP 57490 |
36.77 |
| 2026-05-14 00:00 |
11:44:31.26 |
+04:48:21.2 |
HIP 57083 |
35.99 |
| 2026-05-14 12:00 |
11:44:26.73 |
+04:48:44.9 |
HIP 57083 |
34.92 |
| 2026-05-15 00:00 |
11:44:22.32 |
+04:49:07.9 |
HIP 57083 |
33.87 |
| 2026-05-15 12:00 |
11:44:18.00 |
+04:49:30.1 |
HIP 57083 |
32.85 |
| 2026-05-16 00:00 |
11:44:13.79 |
+04:49:51.6 |
HIP 57083 |
31.87 |
| 2026-05-16 12:00 |
11:44:09.69 |
+04:50:12.4 |
HIP 57083 |
30.92 |
| 2026-05-17 00:00 |
11:44:05.69 |
+04:50:32.5 |
HIP 57083 |
30.00 |
| 2026-05-17 12:00 |
11:44:01.80 |
+04:50:51.9 |
HIP 57083 |
29.11 |
| 2026-05-18 00:00 |
11:43:58.01 |
+04:51:10.5 |
HIP 57083 |
28.26 |
| 2026-05-18 12:00 |
11:43:54.33 |
+04:51:28.4 |
HIP 57083 |
27.44 |
| 2026-05-19 00:00 |
11:43:50.76 |
+04:51:45.5 |
HIP 57083 |
26.65 |
| 2026-05-19 12:00 |
11:43:47.29 |
+04:52:02.0 |
HIP 57083 |
25.89 |
| 2026-05-20 00:00 |
11:43:43.93 |
+04:52:17.7 |
HIP 57083 |
25.16 |
| 2026-05-20 12:00 |
11:43:40.68 |
+04:52:32.6 |
HIP 57083 |
24.47 |
| 2026-05-21 00:00 |
11:43:37.53 |
+04:52:46.9 |
HIP 57083 |
23.80 |
| 2026-05-21 12:00 |
11:43:34.49 |
+04:53:00.4 |
HIP 57083 |
23.17 |
| 2026-05-22 00:00 |
11:43:31.56 |
+04:53:13.2 |
HIP 57083 |
22.56 |
| 2026-05-22 12:00 |
11:43:28.74 |
+04:53:25.2 |
HIP 57083 |
21.99 |
| 2026-05-23 00:00 |
11:43:26.03 |
+04:53:36.5 |
HIP 57083 |
21.45 |
| 2026-05-23 12:00 |
11:43:23.42 |
+04:53:47.1 |
HIP 57083 |
20.93 |
| 2026-05-24 00:00 |
11:43:20.92 |
+04:53:57.0 |
HIP 57083 |
20.44 |
| 2026-05-24 12:00 |
11:43:18.53 |
+04:54:06.1 |
HIP 57083 |
19.98 |
| 2026-05-25 00:00 |
11:43:16.25 |
+04:54:14.6 |
HIP 57083 |
19.55 |
| 2026-05-25 12:00 |
11:43:14.08 |
+04:54:22.2 |
HIP 57083 |
19.14 |
| 2026-05-26 00:00 |
11:43:12.01 |
+04:54:29.2 |
HIP 57083 |
18.75 |
| 2026-05-26 12:00 |
11:43:10.06 |
+04:54:35.4 |
HIP 57083 |
18.39 |
| 2026-05-27 00:00 |
11:43:08.21 |
+04:54:41.0 |
HIP 57083 |
18.05 |
| 2026-05-27 12:00 |
11:43:06.47 |
+04:54:45.8 |
HIP 57083 |
17.74 |
| 2026-05-28 00:00 |
11:43:04.84 |
+04:54:49.8 |
HIP 57083 |
17.44 |
| 2026-05-28 12:00 |
11:43:03.32 |
+04:54:53.2 |
HIP 57083 |
17.16 |
| 2026-05-29 00:00 |
11:43:01.90 |
+04:54:55.8 |
HIP 57083 |
16.90 |
| 2026-05-29 12:00 |
11:43:00.59 |
+04:54:57.7 |
HIP 57083 |
16.66 |
| 2026-05-30 00:00 |
11:42:59.40 |
+04:54:58.9 |
HIP 57083 |
16.44 |
| 2026-05-30 12:00 |
11:42:58.31 |
+04:54:59.4 |
HIP 57083 |
16.23 |
| 2026-05-31 00:00 |
11:42:57.32 |
+04:54:59.2 |
HIP 57083 |
16.04 |
| 2026-05-31 12:00 |
11:42:56.45 |
+04:54:58.3 |
HIP 57083 |
15.86 |
| 2026-06-01 00:00 |
11:42:55.69 |
+04:54:56.6 |
HIP 57083 |
15.70 |
| 2026-06-01 12:00 |
11:42:55.03 |
+04:54:54.2 |
HIP 57083 |
15.55 |
| 2026-06-02 00:00 |
11:42:54.48 |
+04:54:51.2 |
HIP 57083 |
15.41 |