C/2011 K1 (Schwartz-Holvorcem)
| Parameter |
Value |
| Designation |
C/2011 K1 (Schwartz-Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-04-21T22:15:47.076480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:50Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-06-03.0000000 |
| e |
1.00702797 |
| q (au) |
3.376629 |
| a (au) |
-480.455780 |
| i (deg) |
122.624865 |
| Ω (om, deg) |
70.737393 |
| ω (w, deg) |
167.097081 |
| M (ma, deg) |
0.003938 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.629 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.629 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.980 |
| 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) |
| 2026-02-03 00:00 |
06:43:44.96 |
-19:42:37.7 |
HIP 32297 |
11.29 |
| 2026-02-03 12:00 |
06:43:41.28 |
-19:42:08.8 |
HIP 32297 |
12.01 |
| 2026-02-04 00:00 |
06:43:37.62 |
-19:41:39.6 |
HIP 32297 |
12.77 |
| 2026-02-04 12:00 |
06:43:33.98 |
-19:41:10.1 |
HIP 32297 |
13.54 |
| 2026-02-05 00:00 |
06:43:30.37 |
-19:40:40.4 |
HIP 32179 |
13.47 |
| 2026-02-05 12:00 |
06:43:26.77 |
-19:40:10.4 |
HIP 32179 |
12.68 |
| 2026-02-06 00:00 |
06:43:23.21 |
-19:39:40.2 |
HIP 32179 |
11.92 |
| 2026-02-06 12:00 |
06:43:19.66 |
-19:39:09.7 |
HIP 32179 |
11.18 |
| 2026-02-07 00:00 |
06:43:16.14 |
-19:38:39.0 |
HIP 32179 |
10.48 |
| 2026-02-07 12:00 |
06:43:12.64 |
-19:38:08.0 |
HIP 32179 |
9.83 |
| 2026-02-08 00:00 |
06:43:09.16 |
-19:37:36.8 |
HIP 32179 |
9.23 |
| 2026-02-08 12:00 |
06:43:05.71 |
-19:37:05.3 |
HIP 32179 |
8.69 |
| 2026-02-09 00:00 |
06:43:02.29 |
-19:36:33.5 |
HIP 32179 |
8.23 |
| 2026-02-09 12:00 |
06:42:58.88 |
-19:36:01.6 |
HIP 32179 |
7.85 |
| 2026-02-10 00:00 |
06:42:55.51 |
-19:35:29.4 |
HIP 32179 |
7.57 |
| 2026-02-10 12:00 |
06:42:52.16 |
-19:34:56.9 |
HIP 32179 |
7.40 |
| 2026-02-11 00:00 |
06:42:48.83 |
-19:34:24.2 |
HIP 32179 |
7.34 |
| 2026-02-11 12:00 |
06:42:45.53 |
-19:33:51.3 |
HIP 32179 |
7.40 |
| 2026-02-12 00:00 |
06:42:42.26 |
-19:33:18.2 |
HIP 32179 |
7.57 |
| 2026-02-12 12:00 |
06:42:39.01 |
-19:32:44.8 |
HIP 32179 |
7.85 |
| 2026-02-13 00:00 |
06:42:35.79 |
-19:32:11.2 |
HIP 32179 |
8.22 |
| 2026-02-13 12:00 |
06:42:32.60 |
-19:31:37.4 |
HIP 32179 |
8.67 |
| 2026-02-14 00:00 |
06:42:29.44 |
-19:31:03.3 |
HIP 32179 |
9.19 |
| 2026-02-14 12:00 |
06:42:26.30 |
-19:30:29.1 |
HIP 32179 |
9.76 |
| 2026-02-15 00:00 |
06:42:23.18 |
-19:29:54.6 |
HIP 32179 |
10.38 |
| 2026-02-15 12:00 |
06:42:20.10 |
-19:29:19.9 |
HIP 32147 |
10.42 |
| 2026-02-16 00:00 |
06:42:17.05 |
-19:28:45.0 |
HIP 32147 |
10.47 |
| 2026-02-16 12:00 |
06:42:14.02 |
-19:28:09.9 |
HIP 32147 |
10.60 |
| 2026-02-17 00:00 |
06:42:11.02 |
-19:27:34.7 |
HIP 32147 |
10.79 |
| 2026-02-17 12:00 |
06:42:08.05 |
-19:26:59.2 |
HIP 32147 |
11.05 |
| 2026-02-18 00:00 |
06:42:05.11 |
-19:26:23.5 |
HIP 32147 |
11.37 |
| 2026-02-18 12:00 |
06:42:02.20 |
-19:25:47.6 |
HIP 32147 |
11.74 |
| 2026-02-19 00:00 |
06:41:59.31 |
-19:25:11.5 |
HIP 32147 |
12.16 |
| 2026-02-19 12:00 |
06:41:56.46 |
-19:24:35.3 |
HIP 32147 |
12.63 |
| 2026-02-20 00:00 |
06:41:53.64 |
-19:23:58.8 |
HIP 32147 |
13.14 |
| 2026-02-20 12:00 |
06:41:50.84 |
-19:23:22.2 |
HIP 32147 |
13.68 |
| 2026-02-21 00:00 |
06:41:48.08 |
-19:22:45.4 |
HIP 32147 |
14.25 |
| 2026-02-21 12:00 |
06:41:45.34 |
-19:22:08.4 |
HIP 32147 |
14.84 |
| 2026-02-22 00:00 |
06:41:42.64 |
-19:21:31.3 |
HIP 32147 |
15.45 |
| 2026-02-22 12:00 |
06:41:39.97 |
-19:20:54.0 |
HIP 32147 |
16.09 |
| 2026-02-23 00:00 |
06:41:37.33 |
-19:20:16.5 |
HIP 32147 |
16.74 |
| 2026-02-23 12:00 |
06:41:34.72 |
-19:19:38.9 |
HIP 32147 |
17.40 |
| 2026-02-24 00:00 |
06:41:32.13 |
-19:19:01.1 |
HIP 32147 |
18.07 |