메타데이터
| 항목 |
값 |
| Designation |
C/2021 G1 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-22T06:47:31.761600Z |
| Orbit solution date (soln_date, UTC) |
2025-01-14T17:42:12Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-04-11T07:50:24.892800Z |
| Discovery magnitude (MPC) |
21.72 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-04-21.0000000 |
| e |
0.95490157 |
| q (au) |
3.423704 |
| a (au) |
75.916250 |
| i (deg) |
131.566251 |
| Ω (om, deg) |
270.695657 |
| ω (w, deg) |
107.498712 |
| M (ma, deg) |
359.862493 |
밝기
산란 + 전체 선형
$$
M_a = (19.995 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
19.995 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:12:14.00 |
-13:13:44.0 |
HIP 19608 |
2.13 |
| 2026-07-29 12:00 |
04:12:16.90 |
-13:14:58.5 |
HIP 19608 |
3.22 |
| 2026-07-30 00:00 |
04:12:19.74 |
-13:16:13.5 |
HIP 19608 |
4.50 |
| 2026-07-30 12:00 |
04:12:22.52 |
-13:17:29.0 |
HIP 19608 |
5.85 |
| 2026-07-31 00:00 |
04:12:25.24 |
-13:18:45.0 |
HIP 19608 |
7.22 |
| 2026-07-31 12:00 |
04:12:27.89 |
-13:20:01.4 |
HIP 19608 |
8.60 |
| 2026-08-01 00:00 |
04:12:30.48 |
-13:21:18.3 |
HIP 19608 |
10.00 |
| 2026-08-01 12:00 |
04:12:33.01 |
-13:22:35.6 |
HIP 19608 |
11.40 |
| 2026-08-02 00:00 |
04:12:35.47 |
-13:23:53.4 |
HIP 19608 |
12.80 |
| 2026-08-02 12:00 |
04:12:37.87 |
-13:25:11.7 |
HIP 19608 |
14.21 |
| 2026-08-03 00:00 |
04:12:40.21 |
-13:26:30.4 |
HIP 19614 |
13.68 |
| 2026-08-03 12:00 |
04:12:42.49 |
-13:27:49.6 |
HIP 19614 |
12.89 |
| 2026-08-04 00:00 |
04:12:44.70 |
-13:29:09.2 |
HIP 19614 |
12.20 |
| 2026-08-04 12:00 |
04:12:46.84 |
-13:30:29.2 |
HIP 19614 |
11.62 |
| 2026-08-05 00:00 |
04:12:48.92 |
-13:31:49.7 |
HIP 19614 |
11.19 |
| 2026-08-05 12:00 |
04:12:50.93 |
-13:33:10.7 |
HIP 19614 |
10.91 |
| 2026-08-06 00:00 |
04:12:52.88 |
-13:34:32.1 |
HIP 19614 |
10.79 |
| 2026-08-06 12:00 |
04:12:54.76 |
-13:35:53.9 |
HIP 19614 |
10.85 |
| 2026-08-07 00:00 |
04:12:56.58 |
-13:37:16.1 |
HIP 19614 |
11.08 |
| 2026-08-07 12:00 |
04:12:58.33 |
-13:38:38.8 |
HIP 19614 |
11.47 |
| 2026-08-08 00:00 |
04:13:00.01 |
-13:40:01.8 |
HIP 19614 |
12.00 |
| 2026-08-08 12:00 |
04:13:01.62 |
-13:41:25.3 |
HIP 19614 |
12.67 |
| 2026-08-09 00:00 |
04:13:03.17 |
-13:42:49.3 |
HIP 19614 |
13.44 |
| 2026-08-09 12:00 |
04:13:04.65 |
-13:44:13.6 |
HIP 19614 |
14.31 |
| 2026-08-10 00:00 |
04:13:06.06 |
-13:45:38.3 |
HIP 19614 |
15.25 |
| 2026-08-10 12:00 |
04:13:07.40 |
-13:47:03.5 |
HIP 19614 |
16.26 |
| 2026-08-11 00:00 |
04:13:08.67 |
-13:48:29.0 |
HIP 19614 |
17.33 |
| 2026-08-11 12:00 |
04:13:09.87 |
-13:49:55.0 |
HIP 19614 |
18.44 |
| 2026-08-12 00:00 |
04:13:11.00 |
-13:51:21.3 |
HIP 19614 |
19.58 |
| 2026-08-12 12:00 |
04:13:12.06 |
-13:52:48.0 |
HIP 19614 |
20.76 |
| 2026-08-13 00:00 |
04:13:13.05 |
-13:54:15.1 |
HIP 19614 |
21.97 |
| 2026-08-13 12:00 |
04:13:13.97 |
-13:55:42.6 |
HIP 19614 |
23.20 |
| 2026-08-14 00:00 |
04:13:14.81 |
-13:57:10.4 |
HIP 19692 |
22.30 |
| 2026-08-14 12:00 |
04:13:15.59 |
-13:58:38.6 |
HIP 19692 |
20.86 |
| 2026-08-15 00:00 |
04:13:16.30 |
-14:00:07.2 |
HIP 19692 |
19.41 |
| 2026-08-15 12:00 |
04:13:16.93 |
-14:01:36.2 |
HIP 19692 |
17.96 |
| 2026-08-16 00:00 |
04:13:17.49 |
-14:03:05.5 |
HIP 19692 |
16.51 |
| 2026-08-16 12:00 |
04:13:17.98 |
-14:04:35.1 |
HIP 19692 |
15.07 |
| 2026-08-17 00:00 |
04:13:18.39 |
-14:06:05.1 |
HIP 19692 |
13.62 |
| 2026-08-17 12:00 |
04:13:18.74 |
-14:07:35.4 |
HIP 19692 |
12.18 |
| 2026-08-18 00:00 |
04:13:19.01 |
-14:09:06.1 |
HIP 19692 |
10.74 |
| 2026-08-18 12:00 |
04:13:19.21 |
-14:10:37.1 |
HIP 19692 |
9.32 |
| 2026-08-19 00:00 |
04:13:19.33 |
-14:12:08.4 |
HIP 19692 |
7.92 |