160P/LINEAR
| Parameter |
Value |
| Designation |
160P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-09-18T12:33:16.488000Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:49Z |
| Obs used |
973 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
31.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-09-19.0000000 |
| e |
0.47909715 |
| q (au) |
2.066541 |
| a (au) |
3.967229 |
| i (deg) |
17.276215 |
| Ω (om, deg) |
337.002091 |
| ω (w, deg) |
18.198295 |
| M (ma, deg) |
0.059483 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.016 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.016 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.994 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-07-15 |
2019-08-02 |
+40.9969 |
-10.922 |
| 2019-08-02 |
2020-10-25 |
-18.3580 |
+8.627 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:42:43.84 |
-34:20:49.9 |
HIP 76945 |
21.80 |
| 2026-02-03 12:00 |
15:43:11.23 |
-34:24:03.7 |
HIP 76945 |
19.57 |
| 2026-02-04 00:00 |
15:43:38.49 |
-34:27:17.5 |
HIP 76945 |
19.36 |
| 2026-02-04 12:00 |
15:44:05.60 |
-34:30:31.3 |
HIP 77157 |
19.03 |
| 2026-02-05 00:00 |
15:44:32.58 |
-34:33:45.1 |
HIP 77157 |
18.25 |
| 2026-02-05 12:00 |
15:44:59.41 |
-34:36:58.8 |
HIP 77157 |
19.67 |
| 2026-02-06 00:00 |
15:45:26.11 |
-34:40:12.5 |
HIP 77286 |
16.08 |
| 2026-02-06 12:00 |
15:45:52.65 |
-34:43:26.2 |
HIP 77286 |
10.89 |
| 2026-02-07 00:00 |
15:46:19.05 |
-34:46:39.8 |
HIP 77286 |
7.71 |
| 2026-02-07 12:00 |
15:46:45.30 |
-34:49:53.4 |
HIP 77286 |
8.95 |
| 2026-02-08 00:00 |
15:47:11.40 |
-34:53:07.0 |
HIP 77286 |
13.39 |
| 2026-02-08 12:00 |
15:47:37.35 |
-34:56:20.6 |
HIP 77286 |
18.87 |
| 2026-02-09 00:00 |
15:48:03.14 |
-34:59:34.1 |
HIP 77286 |
24.68 |
| 2026-02-09 12:00 |
15:48:28.77 |
-35:02:47.6 |
HIP 77631 |
30.21 |
| 2026-02-10 00:00 |
15:48:54.24 |
-35:06:01.1 |
HIP 77631 |
25.19 |
| 2026-02-10 12:00 |
15:49:19.56 |
-35:09:14.5 |
HIP 77631 |
20.80 |
| 2026-02-11 00:00 |
15:49:44.71 |
-35:12:27.9 |
HIP 77631 |
17.52 |
| 2026-02-11 12:00 |
15:50:09.69 |
-35:15:41.3 |
HIP 77631 |
15.99 |
| 2026-02-12 00:00 |
15:50:34.51 |
-35:18:54.7 |
HIP 77631 |
16.66 |
| 2026-02-12 12:00 |
15:50:59.15 |
-35:22:08.1 |
HIP 77631 |
19.28 |
| 2026-02-13 00:00 |
15:51:23.63 |
-35:25:21.4 |
HIP 77631 |
23.17 |
| 2026-02-13 12:00 |
15:51:47.93 |
-35:28:34.6 |
HIP 77631 |
27.78 |
| 2026-02-14 00:00 |
15:52:12.06 |
-35:31:47.9 |
HIP 77631 |
32.80 |
| 2026-02-14 12:00 |
15:52:36.01 |
-35:35:01.1 |
HIP 77631 |
38.04 |
| 2026-02-15 00:00 |
15:52:59.77 |
-35:38:14.3 |
HIP 78020 |
34.78 |
| 2026-02-15 12:00 |
15:53:23.36 |
-35:41:27.4 |
HIP 78020 |
29.91 |
| 2026-02-16 00:00 |
15:53:46.76 |
-35:44:40.6 |
HIP 78020 |
25.47 |
| 2026-02-16 12:00 |
15:54:09.98 |
-35:47:53.6 |
HIP 78020 |
21.69 |
| 2026-02-17 00:00 |
15:54:33.00 |
-35:51:06.7 |
HIP 78020 |
18.95 |
| 2026-02-17 12:00 |
15:54:55.84 |
-35:54:19.7 |
HIP 78020 |
17.69 |
| 2026-02-18 00:00 |
15:55:18.48 |
-35:57:32.7 |
HIP 78020 |
18.19 |
| 2026-02-18 12:00 |
15:55:40.93 |
-36:00:45.6 |
HIP 78118 |
17.77 |
| 2026-02-19 00:00 |
15:56:03.18 |
-36:03:58.5 |
HIP 78118 |
15.03 |
| 2026-02-19 12:00 |
15:56:25.23 |
-36:07:11.3 |
HIP 78142 |
11.99 |
| 2026-02-20 00:00 |
15:56:47.08 |
-36:10:24.1 |
HIP 78142 |
6.95 |
| 2026-02-20 12:00 |
15:57:08.72 |
-36:13:36.9 |
HIP 78142 |
3.56 |
| 2026-02-21 00:00 |
15:57:30.17 |
-36:16:49.6 |
HIP 78142 |
5.98 |
| 2026-02-21 12:00 |
15:57:51.40 |
-36:20:02.3 |
HIP 78142 |
10.78 |
| 2026-02-22 00:00 |
15:58:12.42 |
-36:23:14.9 |
HIP 78142 |
15.91 |
| 2026-02-22 12:00 |
15:58:33.23 |
-36:26:27.5 |
HIP 78345 |
15.47 |
| 2026-02-23 00:00 |
15:58:53.83 |
-36:29:40.0 |
HIP 78345 |
11.26 |
| 2026-02-23 12:00 |
15:59:14.21 |
-36:32:52.5 |
HIP 78345 |
8.36 |
| 2026-02-24 00:00 |
15:59:34.38 |
-36:36:04.9 |
HIP 78345 |
8.21 |