| Parameter |
Value |
| Designation |
C/2016 A8 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-30T16:04:12.187200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:22Z |
| Obs used |
1422 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
13.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-11.0000000 |
| e |
0.94634519 |
| q (au) |
1.881129 |
| a (au) |
35.059838 |
| i (deg) |
148.211836 |
| Ω (om, deg) |
111.232164 |
| ω (w, deg) |
130.265301 |
| M (ma, deg) |
359.906613 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.519 + 5.854\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.519 |
| n |
5.854 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.998 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2014-08-24 |
2016-01-17 |
-32.6027 |
+16.540 |
| 2016-01-17 |
2016-08-30 |
+0.8040 |
-0.427 |
| 2016-08-30 |
2017-03-05 |
-3.2783 |
+0.896 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
11:31:27.90 |
-29:27:24.9 |
HIP 56280 |
15.79 |
| 2026-09-25 12:00 |
11:31:32.75 |
-29:27:53.9 |
HIP 56280 |
15.48 |
| 2026-09-26 00:00 |
11:31:37.58 |
-29:28:23.2 |
HIP 56280 |
15.26 |
| 2026-09-26 12:00 |
11:31:42.41 |
-29:28:52.7 |
HIP 56280 |
15.13 |
| 2026-09-27 00:00 |
11:31:47.23 |
-29:29:22.6 |
HIP 56280 |
15.10 |
| 2026-09-27 12:00 |
11:31:52.04 |
-29:29:52.8 |
HIP 56280 |
15.16 |
| 2026-09-28 00:00 |
11:31:56.84 |
-29:30:23.2 |
HIP 56280 |
15.31 |
| 2026-09-28 12:00 |
11:32:01.63 |
-29:30:53.9 |
HIP 56280 |
15.55 |
| 2026-09-29 00:00 |
11:32:06.42 |
-29:31:24.9 |
HIP 56280 |
15.88 |
| 2026-09-29 12:00 |
11:32:11.19 |
-29:31:56.1 |
HIP 56280 |
16.29 |
| 2026-09-30 00:00 |
11:32:15.95 |
-29:32:27.7 |
HIP 56280 |
16.78 |
| 2026-09-30 12:00 |
11:32:20.70 |
-29:32:59.5 |
HIP 56280 |
17.33 |
| 2026-10-01 00:00 |
11:32:25.44 |
-29:33:31.6 |
HIP 56280 |
17.95 |
| 2026-10-01 12:00 |
11:32:30.17 |
-29:34:03.9 |
HIP 56280 |
18.63 |
| 2026-10-02 00:00 |
11:32:34.88 |
-29:34:36.5 |
HIP 56280 |
19.35 |
| 2026-10-02 12:00 |
11:32:39.58 |
-29:35:09.4 |
HIP 56280 |
20.12 |
| 2026-10-03 00:00 |
11:32:44.27 |
-29:35:42.6 |
HIP 56280 |
20.93 |
| 2026-10-03 12:00 |
11:32:48.95 |
-29:36:16.0 |
HIP 56280 |
21.77 |
| 2026-10-04 00:00 |
11:32:53.62 |
-29:36:49.6 |
HIP 56280 |
22.64 |
| 2026-10-04 12:00 |
11:32:58.27 |
-29:37:23.6 |
HIP 56280 |
23.54 |
| 2026-10-05 00:00 |
11:33:02.91 |
-29:37:57.7 |
HIP 56280 |
24.47 |
| 2026-10-05 12:00 |
11:33:07.53 |
-29:38:32.2 |
HIP 56280 |
25.42 |
| 2026-10-06 00:00 |
11:33:12.14 |
-29:39:06.9 |
HIP 56280 |
26.39 |
| 2026-10-06 12:00 |
11:33:16.73 |
-29:39:41.8 |
HIP 56280 |
27.37 |
| 2026-10-07 00:00 |
11:33:21.31 |
-29:40:17.0 |
HIP 56280 |
28.37 |
| 2026-10-07 12:00 |
11:33:25.87 |
-29:40:52.4 |
HIP 56280 |
29.38 |
| 2026-10-08 00:00 |
11:33:30.42 |
-29:41:28.0 |
HIP 56504 |
28.45 |
| 2026-10-08 12:00 |
11:33:34.95 |
-29:42:03.9 |
HIP 56504 |
27.34 |
| 2026-10-09 00:00 |
11:33:39.46 |
-29:42:40.1 |
HIP 56504 |
26.23 |
| 2026-10-09 12:00 |
11:33:43.96 |
-29:43:16.4 |
HIP 56504 |
25.13 |
| 2026-10-10 00:00 |
11:33:48.44 |
-29:43:53.0 |
HIP 56504 |
24.02 |
| 2026-10-10 12:00 |
11:33:52.90 |
-29:44:29.8 |
HIP 56504 |
22.93 |
| 2026-10-11 00:00 |
11:33:57.34 |
-29:45:06.9 |
HIP 56504 |
21.83 |
| 2026-10-11 12:00 |
11:34:01.76 |
-29:45:44.1 |
HIP 56504 |
20.74 |
| 2026-10-12 00:00 |
11:34:06.17 |
-29:46:21.6 |
HIP 56504 |
19.66 |
| 2026-10-12 12:00 |
11:34:10.56 |
-29:46:59.3 |
HIP 56504 |
18.59 |
| 2026-10-13 00:00 |
11:34:14.92 |
-29:47:37.2 |
HIP 56504 |
17.52 |
| 2026-10-13 12:00 |
11:34:19.27 |
-29:48:15.4 |
HIP 56504 |
16.46 |
| 2026-10-14 00:00 |
11:34:23.59 |
-29:48:53.7 |
HIP 56504 |
15.41 |
| 2026-10-14 12:00 |
11:34:27.90 |
-29:49:32.2 |
HIP 56504 |
14.38 |
| 2026-10-15 00:00 |
11:34:32.18 |
-29:50:11.0 |
HIP 56504 |
13.36 |
| 2026-10-15 12:00 |
11:34:36.45 |
-29:50:49.9 |
HIP 56504 |
12.36 |
| 2026-10-16 00:00 |
11:34:40.69 |
-29:51:29.0 |
HIP 56504 |
11.38 |