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 · 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) |
| 2026-05-12 00:00 |
04:40:18.71 |
-35:55:41.8 |
HIP 21724 |
17.93 |
| 2026-05-12 12:00 |
04:40:26.51 |
-35:54:49.8 |
HIP 21724 |
17.69 |
| 2026-05-13 00:00 |
04:40:34.32 |
-35:53:58.6 |
HIP 21724 |
17.64 |
| 2026-05-13 12:00 |
04:40:42.16 |
-35:53:08.1 |
HIP 21724 |
17.78 |
| 2026-05-14 00:00 |
04:40:50.02 |
-35:52:18.5 |
HIP 21724 |
18.12 |
| 2026-05-14 12:00 |
04:40:57.90 |
-35:51:29.6 |
HIP 21724 |
18.64 |
| 2026-05-15 00:00 |
04:41:05.80 |
-35:50:41.4 |
HIP 21724 |
19.32 |
| 2026-05-15 12:00 |
04:41:13.72 |
-35:49:54.1 |
HIP 21724 |
20.15 |
| 2026-05-16 00:00 |
04:41:21.65 |
-35:49:07.5 |
HIP 21724 |
21.11 |
| 2026-05-16 12:00 |
04:41:29.61 |
-35:48:21.7 |
HIP 21872 |
21.34 |
| 2026-05-17 00:00 |
04:41:37.58 |
-35:47:36.6 |
HIP 21872 |
20.08 |
| 2026-05-17 12:00 |
04:41:45.57 |
-35:46:52.4 |
HIP 21872 |
18.91 |
| 2026-05-18 00:00 |
04:41:53.57 |
-35:46:08.9 |
HIP 21872 |
17.86 |
| 2026-05-18 12:00 |
04:42:01.59 |
-35:45:26.2 |
HIP 21872 |
16.93 |
| 2026-05-19 00:00 |
04:42:09.62 |
-35:44:44.3 |
HIP 21872 |
16.17 |
| 2026-05-19 12:00 |
04:42:17.67 |
-35:44:03.2 |
HIP 21872 |
15.59 |
| 2026-05-20 00:00 |
04:42:25.73 |
-35:43:22.8 |
HIP 21872 |
15.20 |
| 2026-05-20 12:00 |
04:42:33.81 |
-35:42:43.3 |
HIP 21872 |
15.03 |
| 2026-05-21 00:00 |
04:42:41.90 |
-35:42:04.5 |
HIP 21872 |
15.08 |
| 2026-05-21 12:00 |
04:42:49.99 |
-35:41:26.5 |
HIP 21872 |
15.35 |
| 2026-05-22 00:00 |
04:42:58.10 |
-35:40:49.3 |
HIP 21872 |
15.82 |
| 2026-05-22 12:00 |
04:43:06.22 |
-35:40:12.9 |
HIP 21872 |
16.48 |
| 2026-05-23 00:00 |
04:43:14.35 |
-35:39:37.3 |
HIP 21872 |
17.30 |
| 2026-05-23 12:00 |
04:43:22.49 |
-35:39:02.5 |
HIP 21872 |
18.26 |
| 2026-05-24 00:00 |
04:43:30.64 |
-35:38:28.5 |
HIP 21872 |
19.35 |
| 2026-05-24 12:00 |
04:43:38.80 |
-35:37:55.2 |
HIP 21872 |
20.53 |
| 2026-05-25 00:00 |
04:43:46.96 |
-35:37:22.8 |
HIP 21872 |
21.80 |
| 2026-05-25 12:00 |
04:43:55.13 |
-35:36:51.1 |
HIP 21872 |
23.14 |
| 2026-05-26 00:00 |
04:44:03.31 |
-35:36:20.2 |
HIP 21872 |
24.53 |
| 2026-05-26 12:00 |
04:44:11.50 |
-35:35:50.2 |
HIP 21872 |
25.97 |
| 2026-05-27 00:00 |
04:44:19.69 |
-35:35:20.9 |
HIP 21872 |
27.45 |
| 2026-05-27 12:00 |
04:44:27.88 |
-35:34:52.4 |
HIP 22194 |
27.60 |
| 2026-05-28 00:00 |
04:44:36.08 |
-35:34:24.7 |
HIP 22194 |
26.40 |
| 2026-05-28 12:00 |
04:44:44.29 |
-35:33:57.7 |
HIP 22194 |
25.25 |
| 2026-05-29 00:00 |
04:44:52.49 |
-35:33:31.6 |
HIP 22194 |
24.17 |
| 2026-05-29 12:00 |
04:45:00.71 |
-35:33:06.3 |
HIP 22194 |
23.15 |
| 2026-05-30 00:00 |
04:45:08.92 |
-35:32:41.7 |
HIP 22194 |
22.21 |
| 2026-05-30 12:00 |
04:45:17.13 |
-35:32:18.0 |
HIP 22194 |
21.36 |
| 2026-05-31 00:00 |
04:45:25.35 |
-35:31:55.0 |
HIP 22194 |
20.61 |
| 2026-05-31 12:00 |
04:45:33.57 |
-35:31:32.8 |
HIP 22194 |
19.96 |
| 2026-06-01 00:00 |
04:45:41.79 |
-35:31:11.4 |
HIP 22194 |
19.43 |
| 2026-06-01 12:00 |
04:45:50.01 |
-35:30:50.9 |
HIP 22194 |
19.02 |
| 2026-06-02 00:00 |
04:45:58.23 |
-35:30:31.1 |
HIP 22194 |
18.75 |