| Parameter |
Value |
| Designation |
C/2007 D3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-05-27T16:50:25.203840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:04Z |
| Obs used |
177 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-11-28.0000000 |
| e |
0.99201293 |
| q (au) |
5.208969 |
| a (au) |
652.174844 |
| i (deg) |
45.920258 |
| Ω (om, deg) |
148.429528 |
| ω (w, deg) |
309.094137 |
| M (ma, deg) |
0.010906 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.625 + 3.167\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.625 |
| n |
3.167 |
| gf |
1.000 |
| gb |
-0.948 |
| 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) |
| 2026-07-29 00:00 |
15:55:02.00 |
+26:50:52.2 |
HIP 78038 |
18.37 |
| 2026-07-29 12:00 |
15:55:00.84 |
+26:50:21.3 |
HIP 78038 |
18.90 |
| 2026-07-30 00:00 |
15:54:59.71 |
+26:49:50.2 |
HIP 78038 |
19.44 |
| 2026-07-30 12:00 |
15:54:58.61 |
+26:49:19.0 |
HIP 78038 |
19.98 |
| 2026-07-31 00:00 |
15:54:57.54 |
+26:48:47.6 |
HIP 77956 |
19.90 |
| 2026-07-31 12:00 |
15:54:56.50 |
+26:48:16.0 |
HIP 77956 |
19.43 |
| 2026-08-01 00:00 |
15:54:55.49 |
+26:47:44.2 |
HIP 77956 |
18.95 |
| 2026-08-01 12:00 |
15:54:54.50 |
+26:47:12.4 |
HIP 77956 |
18.48 |
| 2026-08-02 00:00 |
15:54:53.55 |
+26:46:40.3 |
HIP 77956 |
18.00 |
| 2026-08-02 12:00 |
15:54:52.62 |
+26:46:08.1 |
HIP 77956 |
17.53 |
| 2026-08-03 00:00 |
15:54:51.72 |
+26:45:35.7 |
HIP 77956 |
17.07 |
| 2026-08-03 12:00 |
15:54:50.85 |
+26:45:03.2 |
HIP 77956 |
16.60 |
| 2026-08-04 00:00 |
15:54:50.01 |
+26:44:30.6 |
HIP 77956 |
16.14 |
| 2026-08-04 12:00 |
15:54:49.20 |
+26:43:57.8 |
HIP 77956 |
15.68 |
| 2026-08-05 00:00 |
15:54:48.42 |
+26:43:24.9 |
HIP 77956 |
15.22 |
| 2026-08-05 12:00 |
15:54:47.67 |
+26:42:51.8 |
HIP 77956 |
14.77 |
| 2026-08-06 00:00 |
15:54:46.94 |
+26:42:18.6 |
HIP 77956 |
14.32 |
| 2026-08-06 12:00 |
15:54:46.25 |
+26:41:45.2 |
HIP 77956 |
13.88 |
| 2026-08-07 00:00 |
15:54:45.59 |
+26:41:11.7 |
HIP 77956 |
13.44 |
| 2026-08-07 12:00 |
15:54:44.95 |
+26:40:38.1 |
HIP 77956 |
13.01 |
| 2026-08-08 00:00 |
15:54:44.35 |
+26:40:04.4 |
HIP 77956 |
12.58 |
| 2026-08-08 12:00 |
15:54:43.77 |
+26:39:30.5 |
HIP 77956 |
12.16 |
| 2026-08-09 00:00 |
15:54:43.22 |
+26:38:56.5 |
HIP 77956 |
11.75 |
| 2026-08-09 12:00 |
15:54:42.71 |
+26:38:22.4 |
HIP 77956 |
11.35 |
| 2026-08-10 00:00 |
15:54:42.22 |
+26:37:48.1 |
HIP 77956 |
10.96 |
| 2026-08-10 12:00 |
15:54:41.77 |
+26:37:13.8 |
HIP 77956 |
10.58 |
| 2026-08-11 00:00 |
15:54:41.34 |
+26:36:39.3 |
HIP 77956 |
10.22 |
| 2026-08-11 12:00 |
15:54:40.94 |
+26:36:04.7 |
HIP 77956 |
9.86 |
| 2026-08-12 00:00 |
15:54:40.58 |
+26:35:30.0 |
HIP 77956 |
9.53 |
| 2026-08-12 12:00 |
15:54:40.24 |
+26:34:55.2 |
HIP 77956 |
9.21 |
| 2026-08-13 00:00 |
15:54:39.94 |
+26:34:20.3 |
HIP 77956 |
8.92 |
| 2026-08-13 12:00 |
15:54:39.66 |
+26:33:45.3 |
HIP 77956 |
8.64 |
| 2026-08-14 00:00 |
15:54:39.42 |
+26:33:10.2 |
HIP 77956 |
8.40 |
| 2026-08-14 12:00 |
15:54:39.20 |
+26:32:35.0 |
HIP 77956 |
8.18 |
| 2026-08-15 00:00 |
15:54:39.02 |
+26:31:59.7 |
HIP 77956 |
7.99 |
| 2026-08-15 12:00 |
15:54:38.86 |
+26:31:24.4 |
HIP 77956 |
7.83 |
| 2026-08-16 00:00 |
15:54:38.74 |
+26:30:48.9 |
HIP 77956 |
7.71 |
| 2026-08-16 12:00 |
15:54:38.65 |
+26:30:13.3 |
HIP 77956 |
7.63 |
| 2026-08-17 00:00 |
15:54:38.58 |
+26:29:37.7 |
HIP 77956 |
7.58 |
| 2026-08-17 12:00 |
15:54:38.55 |
+26:29:02.0 |
HIP 77956 |
7.58 |
| 2026-08-18 00:00 |
15:54:38.55 |
+26:28:26.2 |
HIP 77956 |
7.61 |
| 2026-08-18 12:00 |
15:54:38.58 |
+26:27:50.4 |
HIP 77956 |
7.69 |
| 2026-08-19 00:00 |
15:54:38.64 |
+26:27:14.4 |
HIP 77956 |
7.80 |