| Parameter |
Value |
| Designation |
74P/Smirnova-Chernykh |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-07-26T18:53:38.227200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T15:24:14Z |
| Obs used |
6028 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-01-30.0000000 |
| e |
0.14785301 |
| q (au) |
3.549250 |
| a (au) |
4.165067 |
| i (deg) |
6.651004 |
| Ω (om, deg) |
77.083800 |
| ω (w, deg) |
86.558859 |
| M (ma, deg) |
148.788615 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.727 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.727 |
| n |
6.000 |
| gf |
0.983 |
| gb |
-0.986 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:25:46.40 |
+26:42:16.2 |
HIP 35967 |
13.72 |
| 2026-06-01 12:00 |
07:26:15.11 |
+26:41:10.3 |
HIP 35967 |
19.65 |
| 2026-06-02 00:00 |
07:26:43.88 |
+26:40:04.1 |
HIP 35967 |
25.87 |
| 2026-06-02 12:00 |
07:27:12.71 |
+26:38:57.5 |
HIP 36262 |
27.51 |
| 2026-06-03 00:00 |
07:27:41.60 |
+26:37:50.7 |
HIP 36262 |
24.58 |
| 2026-06-03 12:00 |
07:28:10.56 |
+26:36:43.5 |
HIP 36262 |
23.17 |
| 2026-06-04 00:00 |
07:28:39.57 |
+26:35:35.9 |
HIP 36416 |
23.27 |
| 2026-06-04 12:00 |
07:29:08.65 |
+26:34:28.1 |
HIP 36416 |
21.87 |
| 2026-06-05 00:00 |
07:29:37.78 |
+26:33:19.9 |
HIP 36416 |
22.42 |
| 2026-06-05 12:00 |
07:30:06.98 |
+26:32:11.4 |
HIP 36601 |
21.03 |
| 2026-06-06 00:00 |
07:30:36.23 |
+26:31:02.6 |
HIP 36601 |
14.39 |
| 2026-06-06 12:00 |
07:31:05.53 |
+26:29:53.4 |
HIP 36601 |
7.76 |
| 2026-06-07 00:00 |
07:31:34.90 |
+26:28:43.9 |
HIP 36601 |
1.34 |
| 2026-06-07 12:00 |
07:32:04.32 |
+26:27:34.1 |
HIP 36601 |
5.71 |
| 2026-06-08 00:00 |
07:32:33.79 |
+26:26:23.9 |
HIP 36601 |
12.38 |
| 2026-06-08 12:00 |
07:33:03.32 |
+26:25:13.4 |
HIP 36725 |
18.51 |
| 2026-06-09 00:00 |
07:33:32.90 |
+26:24:02.6 |
HIP 36725 |
17.80 |
| 2026-06-09 12:00 |
07:34:02.54 |
+26:22:51.5 |
HIP 36725 |
19.54 |
| 2026-06-10 00:00 |
07:34:32.22 |
+26:21:40.0 |
HIP 36912 |
18.15 |
| 2026-06-10 12:00 |
07:35:01.96 |
+26:20:28.2 |
HIP 36912 |
16.25 |
| 2026-06-11 00:00 |
07:35:31.75 |
+26:19:16.0 |
HIP 36912 |
17.04 |
| 2026-06-11 12:00 |
07:36:01.59 |
+26:18:03.6 |
HIP 36912 |
20.22 |
| 2026-06-12 00:00 |
07:36:31.47 |
+26:16:50.8 |
HIP 36912 |
24.90 |
| 2026-06-12 12:00 |
07:37:01.41 |
+26:15:37.6 |
HIP 36912 |
30.40 |
| 2026-06-13 00:00 |
07:37:31.39 |
+26:14:24.1 |
HIP 37064 |
31.09 |
| 2026-06-13 12:00 |
07:38:01.42 |
+26:13:10.3 |
HIP 37064 |
32.18 |
| 2026-06-14 00:00 |
07:38:31.50 |
+26:11:56.2 |
HIP 37064 |
34.62 |
| 2026-06-14 12:00 |
07:39:01.61 |
+26:10:41.8 |
HIP 37337 |
34.62 |
| 2026-06-15 00:00 |
07:39:31.78 |
+26:09:27.0 |
HIP 37452 |
28.69 |
| 2026-06-15 12:00 |
07:40:01.98 |
+26:08:11.9 |
HIP 37452 |
22.55 |
| 2026-06-16 00:00 |
07:40:32.23 |
+26:06:56.4 |
HIP 37452 |
16.98 |
| 2026-06-16 12:00 |
07:41:02.52 |
+26:05:40.7 |
HIP 37452 |
12.80 |
| 2026-06-17 00:00 |
07:41:32.85 |
+26:04:24.6 |
HIP 37452 |
11.61 |
| 2026-06-17 12:00 |
07:42:03.22 |
+26:03:08.1 |
HIP 37452 |
14.22 |
| 2026-06-18 00:00 |
07:42:33.63 |
+26:01:51.4 |
HIP 37452 |
19.14 |
| 2026-06-18 12:00 |
07:43:04.07 |
+26:00:34.3 |
HIP 37704 |
19.56 |
| 2026-06-19 00:00 |
07:43:34.55 |
+25:59:16.9 |
HIP 37704 |
14.23 |
| 2026-06-19 12:00 |
07:44:05.07 |
+25:57:59.2 |
HIP 37704 |
10.94 |
| 2026-06-20 00:00 |
07:44:35.63 |
+25:56:41.2 |
HIP 37704 |
11.60 |
| 2026-06-20 12:00 |
07:45:06.21 |
+25:55:22.9 |
HIP 37848 |
7.03 |
| 2026-06-21 00:00 |
07:45:36.83 |
+25:54:04.2 |
HIP 37848 |
5.36 |
| 2026-06-21 12:00 |
07:46:07.49 |
+25:52:45.2 |
HIP 37848 |
10.31 |
| 2026-06-22 00:00 |
07:46:38.17 |
+25:51:25.9 |
HIP 37971 |
11.05 |