P/2015 D6 (Lemmon-PANSTARRS)
| Parameter |
Value |
| Designation |
P/2015 D6 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-07-21T02:31:34.800960Z |
| Orbit solution date (soln_date, UTC) |
2024-09-01T19:42:23Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
16.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-03.0000000 |
| e |
0.36774122 |
| q (au) |
4.567753 |
| a (au) |
7.224499 |
| i (deg) |
20.225177 |
| Ω (om, deg) |
46.134037 |
| ω (w, deg) |
126.551812 |
| M (ma, deg) |
0.654493 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.288 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.288 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.997 |
| 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) |
| 2026-02-03 00:00 |
00:18:10.51 |
-12:10:48.2 |
HIP 1369 |
17.68 |
| 2026-02-03 12:00 |
00:18:19.73 |
-12:09:05.2 |
HIP 1369 |
19.02 |
| 2026-02-04 00:00 |
00:18:29.00 |
-12:07:22.1 |
HIP 1369 |
20.68 |
| 2026-02-04 12:00 |
00:18:38.35 |
-12:05:38.9 |
HIP 1369 |
22.60 |
| 2026-02-05 00:00 |
00:18:47.75 |
-12:03:55.5 |
HIP 1581 |
22.86 |
| 2026-02-05 12:00 |
00:18:57.21 |
-12:02:12.0 |
HIP 1581 |
22.88 |
| 2026-02-06 00:00 |
00:19:06.73 |
-12:00:28.5 |
HIP 1581 |
23.27 |
| 2026-02-06 12:00 |
00:19:16.31 |
-11:58:44.8 |
HIP 1517 |
23.94 |
| 2026-02-07 00:00 |
00:19:25.95 |
-11:57:01.0 |
HIP 1517 |
22.91 |
| 2026-02-07 12:00 |
00:19:35.64 |
-11:55:17.1 |
HIP 1517 |
22.22 |
| 2026-02-08 00:00 |
00:19:45.40 |
-11:53:33.1 |
HIP 1517 |
21.91 |
| 2026-02-08 12:00 |
00:19:55.21 |
-11:51:49.1 |
HIP 1517 |
22.01 |
| 2026-02-09 00:00 |
00:20:05.08 |
-11:50:04.9 |
HIP 1517 |
22.50 |
| 2026-02-09 12:00 |
00:20:15.00 |
-11:48:20.7 |
HIP 1517 |
23.38 |
| 2026-02-10 00:00 |
00:20:24.98 |
-11:46:36.4 |
HIP 1517 |
24.61 |
| 2026-02-10 12:00 |
00:20:35.01 |
-11:44:52.0 |
HIP 1739 |
26.09 |
| 2026-02-11 00:00 |
00:20:45.10 |
-11:43:07.5 |
HIP 1739 |
25.34 |
| 2026-02-11 12:00 |
00:20:55.24 |
-11:41:23.0 |
HIP 1739 |
24.93 |
| 2026-02-12 00:00 |
00:21:05.44 |
-11:39:38.4 |
HIP 1739 |
24.88 |
| 2026-02-12 12:00 |
00:21:15.69 |
-11:37:53.8 |
HIP 1739 |
25.19 |
| 2026-02-13 00:00 |
00:21:25.99 |
-11:36:09.1 |
HIP 1739 |
25.86 |
| 2026-02-13 12:00 |
00:21:36.34 |
-11:34:24.4 |
HIP 1739 |
26.86 |
| 2026-02-14 00:00 |
00:21:46.75 |
-11:32:39.6 |
HIP 1832 |
25.89 |
| 2026-02-14 12:00 |
00:21:57.20 |
-11:30:54.8 |
HIP 1832 |
22.79 |
| 2026-02-15 00:00 |
00:22:07.71 |
-11:29:10.0 |
HIP 1832 |
19.68 |
| 2026-02-15 12:00 |
00:22:18.27 |
-11:27:25.1 |
HIP 1832 |
16.56 |
| 2026-02-16 00:00 |
00:22:28.87 |
-11:25:40.2 |
HIP 1832 |
13.43 |
| 2026-02-16 12:00 |
00:22:39.52 |
-11:23:55.3 |
HIP 1832 |
10.28 |
| 2026-02-17 00:00 |
00:22:50.22 |
-11:22:10.3 |
HIP 1832 |
7.13 |
| 2026-02-17 12:00 |
00:23:00.97 |
-11:20:25.3 |
HIP 1832 |
3.98 |
| 2026-02-18 00:00 |
00:23:11.76 |
-11:18:40.4 |
HIP 1832 |
0.87 |
| 2026-02-18 12:00 |
00:23:22.60 |
-11:16:55.4 |
HIP 1832 |
2.42 |
| 2026-02-19 00:00 |
00:23:33.49 |
-11:15:10.4 |
HIP 1832 |
5.59 |
| 2026-02-19 12:00 |
00:23:44.42 |
-11:13:25.5 |
HIP 1832 |
8.79 |
| 2026-02-20 00:00 |
00:23:55.40 |
-11:11:40.5 |
HIP 1832 |
12.00 |
| 2026-02-20 12:00 |
00:24:06.42 |
-11:09:55.6 |
HIP 1832 |
15.22 |
| 2026-02-21 00:00 |
00:24:17.48 |
-11:08:10.6 |
HIP 1832 |
18.45 |
| 2026-02-21 12:00 |
00:24:28.58 |
-11:06:25.7 |
HIP 1832 |
21.68 |
| 2026-02-22 00:00 |
00:24:39.73 |
-11:04:40.9 |
HIP 1832 |
24.93 |
| 2026-02-22 12:00 |
00:24:50.91 |
-11:02:56.0 |
HIP 2066 |
27.40 |
| 2026-02-23 00:00 |
00:25:02.14 |
-11:01:11.2 |
HIP 2066 |
26.93 |
| 2026-02-23 12:00 |
00:25:13.41 |
-10:59:26.4 |
HIP 2066 |
26.84 |
| 2026-02-24 00:00 |
00:25:24.72 |
-10:57:41.7 |
HIP 2066 |
27.15 |