C/2012 V2 (LINEAR)
| Parameter |
Value |
| Designation |
C/2012 V2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-16T12:00:32.616000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:28Z |
| Obs used |
1054 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-03-07.0000000 |
| e |
0.99762394 |
| q (au) |
1.454756 |
| a (au) |
612.254628 |
| i (deg) |
67.184787 |
| Ω (om, deg) |
262.164771 |
| ω (w, deg) |
217.323257 |
| M (ma, deg) |
359.989428 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.401 + 5.597\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.401 |
| n |
5.597 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.995 |
| 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 |
| 2012-10-30 |
2013-01-20 |
-3.2735 |
+1.646 |
| 2013-01-20 |
2013-03-25 |
-7.5577 |
+3.461 |
| 2013-03-25 |
2013-08-16 |
+13.2993 |
-4.446 |
| 2013-08-17 |
2013-11-06 |
+2.2763 |
-2.713 |
| 2013-11-06 |
2013-12-16 |
-9.8138 |
+1.381 |
| 2013-12-16 |
2014-05-16 |
+7.6762 |
-3.882 |
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 |
17:52:33.09 |
-12:55:28.8 |
HIP 87402 |
29.77 |
| 2026-02-03 12:00 |
17:52:36.12 |
-12:55:18.1 |
HIP 87402 |
29.94 |
| 2026-02-04 00:00 |
17:52:39.13 |
-12:55:07.2 |
HIP 87402 |
30.12 |
| 2026-02-04 12:00 |
17:52:42.11 |
-12:54:56.3 |
HIP 87402 |
30.31 |
| 2026-02-05 00:00 |
17:52:45.06 |
-12:54:45.3 |
HIP 87402 |
30.51 |
| 2026-02-05 12:00 |
17:52:47.98 |
-12:54:34.2 |
HIP 87402 |
30.73 |
| 2026-02-06 00:00 |
17:52:50.88 |
-12:54:23.1 |
HIP 87402 |
30.96 |
| 2026-02-06 12:00 |
17:52:53.76 |
-12:54:11.9 |
HIP 87402 |
31.20 |
| 2026-02-07 00:00 |
17:52:56.60 |
-12:54:00.6 |
HIP 87402 |
31.45 |
| 2026-02-07 12:00 |
17:52:59.42 |
-12:53:49.2 |
HIP 87402 |
31.71 |
| 2026-02-08 00:00 |
17:53:02.21 |
-12:53:37.7 |
HIP 87402 |
31.97 |
| 2026-02-08 12:00 |
17:53:04.98 |
-12:53:26.2 |
HIP 87402 |
32.25 |
| 2026-02-09 00:00 |
17:53:07.72 |
-12:53:14.6 |
HIP 87402 |
32.53 |
| 2026-02-09 12:00 |
17:53:10.43 |
-12:53:03.0 |
HIP 87402 |
32.82 |
| 2026-02-10 00:00 |
17:53:13.11 |
-12:52:51.2 |
HIP 87402 |
33.12 |
| 2026-02-10 12:00 |
17:53:15.76 |
-12:52:39.4 |
HIP 87402 |
33.42 |
| 2026-02-11 00:00 |
17:53:18.39 |
-12:52:27.5 |
HIP 87402 |
33.73 |
| 2026-02-11 12:00 |
17:53:20.98 |
-12:52:15.6 |
HIP 87402 |
34.04 |
| 2026-02-12 00:00 |
17:53:23.55 |
-12:52:03.6 |
HIP 87402 |
34.35 |
| 2026-02-12 12:00 |
17:53:26.09 |
-12:51:51.5 |
HIP 87402 |
34.67 |
| 2026-02-13 00:00 |
17:53:28.60 |
-12:51:39.4 |
HIP 87402 |
34.99 |
| 2026-02-13 12:00 |
17:53:31.08 |
-12:51:27.1 |
HIP 87402 |
35.32 |
| 2026-02-14 00:00 |
17:53:33.53 |
-12:51:14.8 |
HIP 87402 |
35.65 |
| 2026-02-14 12:00 |
17:53:35.95 |
-12:51:02.5 |
HIP 87402 |
35.98 |
| 2026-02-15 00:00 |
17:53:38.34 |
-12:50:50.1 |
HIP 87402 |
36.31 |
| 2026-02-15 12:00 |
17:53:40.70 |
-12:50:37.6 |
HIP 87402 |
36.64 |
| 2026-02-16 00:00 |
17:53:43.03 |
-12:50:25.1 |
HIP 87402 |
36.97 |
| 2026-02-16 12:00 |
17:53:45.33 |
-12:50:12.5 |
HIP 87402 |
37.30 |
| 2026-02-17 00:00 |
17:53:47.60 |
-12:49:59.8 |
HIP 87402 |
37.63 |
| 2026-02-17 12:00 |
17:53:49.84 |
-12:49:47.1 |
HIP 87402 |
37.97 |
| 2026-02-18 00:00 |
17:53:52.04 |
-12:49:34.3 |
HIP 87402 |
38.30 |
| 2026-02-18 12:00 |
17:53:54.22 |
-12:49:21.4 |
HIP 87402 |
38.63 |
| 2026-02-19 00:00 |
17:53:56.36 |
-12:49:08.5 |
HIP 87402 |
38.95 |
| 2026-02-19 12:00 |
17:53:58.48 |
-12:48:55.6 |
HIP 87402 |
39.28 |
| 2026-02-20 00:00 |
17:54:00.56 |
-12:48:42.5 |
HIP 87402 |
39.60 |
| 2026-02-20 12:00 |
17:54:02.60 |
-12:48:29.5 |
HIP 87402 |
39.93 |
| 2026-02-21 00:00 |
17:54:04.62 |
-12:48:16.3 |
HIP 87402 |
40.25 |
| 2026-02-21 12:00 |
17:54:06.61 |
-12:48:03.1 |
HIP 87402 |
40.56 |
| 2026-02-22 00:00 |
17:54:08.56 |
-12:47:49.9 |
HIP 87402 |
40.88 |
| 2026-02-22 12:00 |
17:54:10.48 |
-12:47:36.6 |
HIP 87402 |
41.19 |
| 2026-02-23 00:00 |
17:54:12.36 |
-12:47:23.3 |
HIP 87402 |
41.50 |
| 2026-02-23 12:00 |
17:54:14.22 |
-12:47:09.9 |
HIP 87402 |
41.80 |
| 2026-02-24 00:00 |
17:54:16.04 |
-12:46:56.4 |
HIP 87402 |
42.10 |