C/1996 R1 (Hergenrother-Spahr)
| Parameter |
Value |
| Designation |
C/1996 R1 (Hergenrother-Spahr) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-08-28T17:45:00.472320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:49Z |
| Obs used |
321 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
24.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-09-28.0000000 |
| e |
0.98558370 |
| q (au) |
1.899198 |
| a (au) |
131.739702 |
| i (deg) |
145.814443 |
| Ω (om, deg) |
149.745053 |
| ω (w, deg) |
139.456909 |
| M (ma, deg) |
0.019724 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.178 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.178 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.991 |
| 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 |
12:49:05.86 |
-37:37:17.6 |
HIP 62640 |
15.35 |
| 2026-02-03 12:00 |
12:49:04.34 |
-37:37:27.4 |
HIP 62640 |
15.69 |
| 2026-02-04 00:00 |
12:49:02.80 |
-37:37:37.0 |
HIP 62640 |
16.03 |
| 2026-02-04 12:00 |
12:49:01.24 |
-37:37:46.5 |
HIP 62640 |
16.38 |
| 2026-02-05 00:00 |
12:48:59.65 |
-37:37:55.7 |
HIP 62640 |
16.73 |
| 2026-02-05 12:00 |
12:48:58.05 |
-37:38:04.8 |
HIP 62640 |
17.08 |
| 2026-02-06 00:00 |
12:48:56.42 |
-37:38:13.7 |
HIP 62640 |
17.43 |
| 2026-02-06 12:00 |
12:48:54.77 |
-37:38:22.5 |
HIP 62640 |
17.78 |
| 2026-02-07 00:00 |
12:48:53.10 |
-37:38:31.0 |
HIP 62640 |
18.14 |
| 2026-02-07 12:00 |
12:48:51.42 |
-37:38:39.4 |
HIP 62640 |
18.49 |
| 2026-02-08 00:00 |
12:48:49.71 |
-37:38:47.6 |
HIP 62640 |
18.85 |
| 2026-02-08 12:00 |
12:48:47.97 |
-37:38:55.6 |
HIP 62640 |
19.21 |
| 2026-02-09 00:00 |
12:48:46.22 |
-37:39:03.4 |
HIP 62640 |
19.58 |
| 2026-02-09 12:00 |
12:48:44.45 |
-37:39:11.0 |
HIP 62640 |
19.94 |
| 2026-02-10 00:00 |
12:48:42.66 |
-37:39:18.5 |
HIP 62640 |
20.31 |
| 2026-02-10 12:00 |
12:48:40.85 |
-37:39:25.7 |
HIP 62640 |
20.68 |
| 2026-02-11 00:00 |
12:48:39.02 |
-37:39:32.8 |
HIP 62640 |
21.06 |
| 2026-02-11 12:00 |
12:48:37.16 |
-37:39:39.7 |
HIP 62640 |
21.43 |
| 2026-02-12 00:00 |
12:48:35.29 |
-37:39:46.4 |
HIP 62640 |
21.81 |
| 2026-02-12 12:00 |
12:48:33.40 |
-37:39:52.9 |
HIP 62640 |
22.18 |
| 2026-02-13 00:00 |
12:48:31.49 |
-37:39:59.2 |
HIP 62640 |
22.57 |
| 2026-02-13 12:00 |
12:48:29.56 |
-37:40:05.3 |
HIP 62640 |
22.95 |
| 2026-02-14 00:00 |
12:48:27.61 |
-37:40:11.2 |
HIP 62640 |
23.33 |
| 2026-02-14 12:00 |
12:48:25.64 |
-37:40:17.0 |
HIP 62640 |
23.72 |
| 2026-02-15 00:00 |
12:48:23.66 |
-37:40:22.5 |
HIP 62640 |
24.11 |
| 2026-02-15 12:00 |
12:48:21.65 |
-37:40:27.8 |
HIP 62640 |
24.50 |
| 2026-02-16 00:00 |
12:48:19.62 |
-37:40:33.0 |
HIP 62435 |
24.35 |
| 2026-02-16 12:00 |
12:48:17.58 |
-37:40:37.9 |
HIP 62435 |
24.16 |
| 2026-02-17 00:00 |
12:48:15.52 |
-37:40:42.7 |
HIP 62435 |
23.98 |
| 2026-02-17 12:00 |
12:48:13.44 |
-37:40:47.3 |
HIP 62435 |
23.81 |
| 2026-02-18 00:00 |
12:48:11.34 |
-37:40:51.6 |
HIP 62435 |
23.65 |
| 2026-02-18 12:00 |
12:48:09.23 |
-37:40:55.8 |
HIP 62435 |
23.49 |
| 2026-02-19 00:00 |
12:48:07.10 |
-37:40:59.8 |
HIP 62435 |
23.34 |
| 2026-02-19 12:00 |
12:48:04.95 |
-37:41:03.5 |
HIP 62435 |
23.21 |
| 2026-02-20 00:00 |
12:48:02.78 |
-37:41:07.1 |
HIP 62435 |
23.08 |
| 2026-02-20 12:00 |
12:48:00.59 |
-37:41:10.5 |
HIP 62435 |
22.96 |
| 2026-02-21 00:00 |
12:47:58.39 |
-37:41:13.6 |
HIP 62435 |
22.86 |
| 2026-02-21 12:00 |
12:47:56.17 |
-37:41:16.6 |
HIP 62435 |
22.76 |
| 2026-02-22 00:00 |
12:47:53.94 |
-37:41:19.4 |
HIP 62435 |
22.68 |
| 2026-02-22 12:00 |
12:47:51.69 |
-37:41:21.9 |
HIP 62435 |
22.61 |
| 2026-02-23 00:00 |
12:47:49.42 |
-37:41:24.3 |
HIP 62435 |
22.55 |
| 2026-02-23 12:00 |
12:47:47.14 |
-37:41:26.5 |
HIP 62435 |
22.50 |
| 2026-02-24 00:00 |
12:47:44.84 |
-37:41:28.4 |
HIP 62435 |
22.46 |