| Parameter |
Value |
| Designation |
C/1977 D1 (Lovas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-11-01T07:57:55.978560Z |
| Orbit solution date (soln_date, UTC) |
2023-08-28T01:42:37Z |
| Obs used |
30 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1977-05-05.0000000 |
| e |
1.00340358 |
| q (au) |
5.715993 |
| a (au) |
-1679.405282 |
| i (deg) |
64.522285 |
| Ω (om, deg) |
338.172768 |
| ω (w, deg) |
146.312104 |
| M (ma, deg) |
0.002645 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.198 + 2.119\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.198 |
| n |
2.119 |
| gf |
0.800 |
| gb |
-0.900 |
| k |
0.800 |
| δ90 |
9.972 |
| 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) |
| 2026-03-26 00:00 |
21:56:38.37 |
-74:18:36.1 |
HIP 108010 |
18.11 |
| 2026-03-26 12:00 |
21:56:43.07 |
-74:18:45.2 |
HIP 108010 |
18.46 |
| 2026-03-27 00:00 |
21:56:47.73 |
-74:18:54.5 |
HIP 108010 |
18.80 |
| 2026-03-27 12:00 |
21:56:52.37 |
-74:19:04.0 |
HIP 108010 |
19.15 |
| 2026-03-28 00:00 |
21:56:56.97 |
-74:19:13.6 |
HIP 108010 |
19.50 |
| 2026-03-28 12:00 |
21:57:01.55 |
-74:19:23.3 |
HIP 108010 |
19.85 |
| 2026-03-29 00:00 |
21:57:06.09 |
-74:19:33.3 |
HIP 108010 |
20.20 |
| 2026-03-29 12:00 |
21:57:10.61 |
-74:19:43.4 |
HIP 108010 |
20.55 |
| 2026-03-30 00:00 |
21:57:15.09 |
-74:19:53.6 |
HIP 108010 |
20.89 |
| 2026-03-30 12:00 |
21:57:19.54 |
-74:20:04.0 |
HIP 108010 |
21.24 |
| 2026-03-31 00:00 |
21:57:23.95 |
-74:20:14.6 |
HIP 108777 |
21.29 |
| 2026-03-31 12:00 |
21:57:28.34 |
-74:20:25.4 |
HIP 108777 |
20.94 |
| 2026-04-01 00:00 |
21:57:32.69 |
-74:20:36.3 |
HIP 108777 |
20.60 |
| 2026-04-01 12:00 |
21:57:37.02 |
-74:20:47.3 |
HIP 108777 |
20.25 |
| 2026-04-02 00:00 |
21:57:41.30 |
-74:20:58.5 |
HIP 108777 |
19.91 |
| 2026-04-02 12:00 |
21:57:45.56 |
-74:21:09.9 |
HIP 108777 |
19.57 |
| 2026-04-03 00:00 |
21:57:49.78 |
-74:21:21.4 |
HIP 108777 |
19.23 |
| 2026-04-03 12:00 |
21:57:53.97 |
-74:21:33.1 |
HIP 108777 |
18.89 |
| 2026-04-04 00:00 |
21:57:58.12 |
-74:21:44.9 |
HIP 108777 |
18.55 |
| 2026-04-04 12:00 |
21:58:02.24 |
-74:21:56.9 |
HIP 108777 |
18.21 |
| 2026-04-05 00:00 |
21:58:06.33 |
-74:22:09.0 |
HIP 108777 |
17.88 |
| 2026-04-05 12:00 |
21:58:10.38 |
-74:22:21.3 |
HIP 108777 |
17.54 |
| 2026-04-06 00:00 |
21:58:14.39 |
-74:22:33.7 |
HIP 108777 |
17.21 |
| 2026-04-06 12:00 |
21:58:18.37 |
-74:22:46.3 |
HIP 108777 |
16.88 |
| 2026-04-07 00:00 |
21:58:22.32 |
-74:22:59.0 |
HIP 108777 |
16.55 |
| 2026-04-07 12:00 |
21:58:26.23 |
-74:23:11.9 |
HIP 108777 |
16.22 |
| 2026-04-08 00:00 |
21:58:30.10 |
-74:23:24.9 |
HIP 108777 |
15.89 |
| 2026-04-08 12:00 |
21:58:33.94 |
-74:23:38.1 |
HIP 108777 |
15.56 |
| 2026-04-09 00:00 |
21:58:37.74 |
-74:23:51.4 |
HIP 108777 |
15.24 |
| 2026-04-09 12:00 |
21:58:41.50 |
-74:24:04.8 |
HIP 108777 |
14.92 |
| 2026-04-10 00:00 |
21:58:45.22 |
-74:24:18.4 |
HIP 108777 |
14.60 |
| 2026-04-10 12:00 |
21:58:48.91 |
-74:24:32.2 |
HIP 108777 |
14.28 |
| 2026-04-11 00:00 |
21:58:52.56 |
-74:24:46.1 |
HIP 108777 |
13.97 |
| 2026-04-11 12:00 |
21:58:56.17 |
-74:25:00.1 |
HIP 108777 |
13.65 |
| 2026-04-12 00:00 |
21:58:59.75 |
-74:25:14.2 |
HIP 108777 |
13.35 |
| 2026-04-12 12:00 |
21:59:03.28 |
-74:25:28.5 |
HIP 108777 |
13.04 |
| 2026-04-13 00:00 |
21:59:06.78 |
-74:25:43.0 |
HIP 108777 |
12.74 |
| 2026-04-13 12:00 |
21:59:10.24 |
-74:25:57.5 |
HIP 108777 |
12.44 |
| 2026-04-14 00:00 |
21:59:13.65 |
-74:26:12.3 |
HIP 108777 |
12.14 |
| 2026-04-14 12:00 |
21:59:17.03 |
-74:26:27.1 |
HIP 108777 |
11.85 |
| 2026-04-15 00:00 |
21:59:20.37 |
-74:26:42.1 |
HIP 108777 |
11.56 |
| 2026-04-15 12:00 |
21:59:23.67 |
-74:26:57.2 |
HIP 108777 |
11.28 |
| 2026-04-16 00:00 |
21:59:26.93 |
-74:27:12.4 |
HIP 108777 |
11.00 |