| 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) |
| 2026-07-29 00:00 |
11:52:46.28 |
+03:39:57.2 |
HIP 57975 |
14.65 |
| 2026-07-29 12:00 |
11:52:56.40 |
+03:38:47.7 |
HIP 57975 |
11.96 |
| 2026-07-30 00:00 |
11:53:06.60 |
+03:37:37.8 |
HIP 57975 |
9.30 |
| 2026-07-30 12:00 |
11:53:16.86 |
+03:36:27.5 |
HIP 57975 |
6.74 |
| 2026-07-31 00:00 |
11:53:27.19 |
+03:35:16.8 |
HIP 57975 |
4.48 |
| 2026-07-31 12:00 |
11:53:37.58 |
+03:34:05.8 |
HIP 57975 |
3.29 |
| 2026-08-01 00:00 |
11:53:48.04 |
+03:32:54.4 |
HIP 57975 |
4.23 |
| 2026-08-01 12:00 |
11:53:58.57 |
+03:31:42.5 |
HIP 57975 |
6.45 |
| 2026-08-02 00:00 |
11:54:09.16 |
+03:30:30.4 |
HIP 57975 |
9.07 |
| 2026-08-02 12:00 |
11:54:19.82 |
+03:29:17.8 |
HIP 57975 |
11.84 |
| 2026-08-03 00:00 |
11:54:30.54 |
+03:28:04.8 |
HIP 57975 |
14.69 |
| 2026-08-03 12:00 |
11:54:41.33 |
+03:26:51.5 |
HIP 58113 |
15.18 |
| 2026-08-04 00:00 |
11:54:52.18 |
+03:25:37.8 |
HIP 58113 |
13.06 |
| 2026-08-04 12:00 |
11:55:03.09 |
+03:24:23.8 |
HIP 58113 |
11.32 |
| 2026-08-05 00:00 |
11:55:14.07 |
+03:23:09.4 |
HIP 58113 |
10.19 |
| 2026-08-05 12:00 |
11:55:25.11 |
+03:21:54.6 |
HIP 58113 |
9.87 |
| 2026-08-06 00:00 |
11:55:36.21 |
+03:20:39.5 |
HIP 58113 |
10.46 |
| 2026-08-06 12:00 |
11:55:47.37 |
+03:19:24.1 |
HIP 58113 |
11.84 |
| 2026-08-07 00:00 |
11:55:58.60 |
+03:18:08.3 |
HIP 58113 |
13.78 |
| 2026-08-07 12:00 |
11:56:09.88 |
+03:16:52.1 |
HIP 58113 |
16.10 |
| 2026-08-08 00:00 |
11:56:21.23 |
+03:15:35.6 |
HIP 58113 |
18.65 |
| 2026-08-08 12:00 |
11:56:32.63 |
+03:14:18.8 |
HIP 58113 |
21.36 |
| 2026-08-09 00:00 |
11:56:44.10 |
+03:13:01.6 |
HIP 58113 |
24.19 |
| 2026-08-09 12:00 |
11:56:55.62 |
+03:11:44.1 |
HIP 58377 |
26.03 |
| 2026-08-10 00:00 |
11:57:07.20 |
+03:10:26.3 |
HIP 58377 |
24.88 |
| 2026-08-10 12:00 |
11:57:18.84 |
+03:09:08.1 |
HIP 58377 |
24.09 |
| 2026-08-11 00:00 |
11:57:30.54 |
+03:07:49.6 |
HIP 58377 |
23.71 |
| 2026-08-11 12:00 |
11:57:42.29 |
+03:06:30.8 |
HIP 58377 |
23.76 |
| 2026-08-12 00:00 |
11:57:54.10 |
+03:05:11.7 |
HIP 58377 |
24.24 |
| 2026-08-12 12:00 |
11:58:05.97 |
+03:03:52.3 |
HIP 58472 |
23.01 |
| 2026-08-13 00:00 |
11:58:17.89 |
+03:02:32.6 |
HIP 58472 |
19.76 |
| 2026-08-13 12:00 |
11:58:29.86 |
+03:01:12.6 |
HIP 58472 |
16.50 |
| 2026-08-14 00:00 |
11:58:41.89 |
+02:59:52.3 |
HIP 58472 |
13.22 |
| 2026-08-14 12:00 |
11:58:53.98 |
+02:58:31.7 |
HIP 58472 |
9.94 |
| 2026-08-15 00:00 |
11:59:06.11 |
+02:57:10.8 |
HIP 58472 |
6.66 |
| 2026-08-15 12:00 |
11:59:18.30 |
+02:55:49.6 |
HIP 58472 |
3.46 |
| 2026-08-16 00:00 |
11:59:30.54 |
+02:54:28.2 |
HIP 58472 |
1.30 |
| 2026-08-16 12:00 |
11:59:42.83 |
+02:53:06.4 |
HIP 58472 |
3.73 |
| 2026-08-17 00:00 |
11:59:55.18 |
+02:51:44.4 |
HIP 58472 |
6.99 |
| 2026-08-17 12:00 |
12:00:07.57 |
+02:50:22.1 |
HIP 58472 |
10.33 |
| 2026-08-18 00:00 |
12:00:20.01 |
+02:48:59.6 |
HIP 58472 |
13.71 |
| 2026-08-18 12:00 |
12:00:32.50 |
+02:47:36.8 |
HIP 58472 |
17.11 |
| 2026-08-19 00:00 |
12:00:45.04 |
+02:46:13.8 |
HIP 58472 |
20.52 |