메타데이터
| 항목 |
값 |
| Designation |
C/2020 S8 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-10T22:18:20.384640Z |
| Orbit solution date (soln_date, UTC) |
2021-08-06T00:42:41Z |
| Obs used |
591 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
16.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-18T02:54:34.272000Z |
| Discovery magnitude (MPC) |
20.10 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-03-21.0000000 |
| e |
0.99139921 |
| q (au) |
2.363839 |
| a (au) |
274.839865 |
| i (deg) |
108.517979 |
| Ω (om, deg) |
24.051990 |
| ω (w, deg) |
160.334070 |
| M (ma, deg) |
359.995473 |
밝기
산란 + 전체 선형
$$
M_a = (10.125 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.125 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.807 |
| k |
0.994 |
| 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) |
| 2026-09-20 00:00 |
05:01:03.43 |
-38:45:32.7 |
HIP 23366 |
10.71 |
| 2026-09-20 12:00 |
05:01:00.04 |
-38:47:05.6 |
HIP 23366 |
9.67 |
| 2026-09-21 00:00 |
05:00:56.56 |
-38:48:38.3 |
HIP 23366 |
8.85 |
| 2026-09-21 12:00 |
05:00:52.99 |
-38:50:10.9 |
HIP 23366 |
8.30 |
| 2026-09-22 00:00 |
05:00:49.34 |
-38:51:43.4 |
HIP 23366 |
8.10 |
| 2026-09-22 12:00 |
05:00:45.60 |
-38:53:15.8 |
HIP 23366 |
8.27 |
| 2026-09-23 00:00 |
05:00:41.77 |
-38:54:48.0 |
HIP 23366 |
8.78 |
| 2026-09-23 12:00 |
05:00:37.86 |
-38:56:20.1 |
HIP 23366 |
9.60 |
| 2026-09-24 00:00 |
05:00:33.86 |
-38:57:52.0 |
HIP 23366 |
10.64 |
| 2026-09-24 12:00 |
05:00:29.77 |
-38:59:23.7 |
HIP 23366 |
11.86 |
| 2026-09-25 00:00 |
05:00:25.60 |
-39:00:55.3 |
HIP 23366 |
13.20 |
| 2026-09-25 12:00 |
05:00:21.34 |
-39:02:26.6 |
HIP 23366 |
14.64 |
| 2026-09-26 00:00 |
05:00:17.00 |
-39:03:57.8 |
HIP 23366 |
16.14 |
| 2026-09-26 12:00 |
05:00:12.57 |
-39:05:28.8 |
HIP 23366 |
17.70 |
| 2026-09-27 00:00 |
05:00:08.05 |
-39:06:59.5 |
HIP 23366 |
19.31 |
| 2026-09-27 12:00 |
05:00:03.45 |
-39:08:30.1 |
HIP 23366 |
20.94 |
| 2026-09-28 00:00 |
04:59:58.76 |
-39:10:00.4 |
HIP 23366 |
22.61 |
| 2026-09-28 12:00 |
04:59:53.99 |
-39:11:30.5 |
HIP 23366 |
24.29 |
| 2026-09-29 00:00 |
04:59:49.13 |
-39:13:00.3 |
HIP 23366 |
26.00 |
| 2026-09-29 12:00 |
04:59:44.18 |
-39:14:29.9 |
HIP 23366 |
27.72 |
| 2026-09-30 00:00 |
04:59:39.15 |
-39:15:59.3 |
HIP 23281 |
27.24 |
| 2026-09-30 12:00 |
04:59:34.04 |
-39:17:28.4 |
HIP 23281 |
26.28 |
| 2026-10-01 00:00 |
04:59:28.84 |
-39:18:57.2 |
HIP 23281 |
25.42 |
| 2026-10-01 12:00 |
04:59:23.56 |
-39:20:25.7 |
HIP 23281 |
24.68 |
| 2026-10-02 00:00 |
04:59:18.19 |
-39:21:53.9 |
HIP 23281 |
24.06 |
| 2026-10-02 12:00 |
04:59:12.74 |
-39:23:21.8 |
HIP 23281 |
23.57 |
| 2026-10-03 00:00 |
04:59:07.20 |
-39:24:49.5 |
HIP 23281 |
23.23 |
| 2026-10-03 12:00 |
04:59:01.58 |
-39:26:16.8 |
HIP 23281 |
23.05 |
| 2026-10-04 00:00 |
04:58:55.87 |
-39:27:43.8 |
HIP 23281 |
23.02 |
| 2026-10-04 12:00 |
04:58:50.08 |
-39:29:10.4 |
HIP 23281 |
23.15 |
| 2026-10-05 00:00 |
04:58:44.21 |
-39:30:36.7 |
HIP 23188 |
23.10 |
| 2026-10-05 12:00 |
04:58:38.25 |
-39:32:02.7 |
HIP 23188 |
22.18 |
| 2026-10-06 00:00 |
04:58:32.21 |
-39:33:28.3 |
HIP 23188 |
21.38 |
| 2026-10-06 12:00 |
04:58:26.08 |
-39:34:53.5 |
HIP 23188 |
20.73 |
| 2026-10-07 00:00 |
04:58:19.88 |
-39:36:18.4 |
HIP 23188 |
20.24 |
| 2026-10-07 12:00 |
04:58:13.59 |
-39:37:42.9 |
HIP 23188 |
19.93 |
| 2026-10-08 00:00 |
04:58:07.22 |
-39:39:07.0 |
HIP 23188 |
19.80 |
| 2026-10-08 12:00 |
04:58:00.76 |
-39:40:30.6 |
HIP 23188 |
19.86 |
| 2026-10-09 00:00 |
04:57:54.23 |
-39:41:53.9 |
HIP 23188 |
20.12 |
| 2026-10-09 12:00 |
04:57:47.61 |
-39:43:16.7 |
HIP 23188 |
20.55 |
| 2026-10-10 00:00 |
04:57:40.91 |
-39:44:39.1 |
HIP 23188 |
21.17 |
| 2026-10-10 12:00 |
04:57:34.14 |
-39:46:01.1 |
HIP 23188 |
21.94 |
| 2026-10-11 00:00 |
04:57:27.28 |
-39:47:22.6 |
HIP 23188 |
22.86 |