메타데이터
| 항목 |
값 |
| Designation |
C/2019 D1 (Flewelling) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-05-11T20:12:52.110720Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
797 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
15.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-02-26T15:28:50.505600Z |
| Discovery magnitude (MPC) |
16.75 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-06-19.0000000 |
| e |
0.98854927 |
| q (au) |
1.577555 |
| a (au) |
137.768888 |
| i (deg) |
34.098372 |
| Ω (om, deg) |
231.717805 |
| ω (w, deg) |
70.477432 |
| M (ma, deg) |
0.023257 |
밝기
산란 + 전체 선형
$$
M_a = (11.316 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.316 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-02-26 |
2019-05-11 |
+2.3057 |
-1.095 |
| 2019-05-12 |
2019-07-27 |
+16.0844 |
-3.717 |
| 2019-07-27 |
2019-12-04 |
-2.5143 |
+1.033 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:53:48.70 |
+02:59:16.0 |
HIP 27799 |
13.14 |
| 2026-09-20 12:00 |
05:53:49.18 |
+02:58:40.7 |
HIP 27799 |
13.43 |
| 2026-09-21 00:00 |
05:53:49.61 |
+02:58:05.3 |
HIP 27799 |
13.73 |
| 2026-09-21 12:00 |
05:53:49.99 |
+02:57:29.9 |
HIP 27799 |
14.03 |
| 2026-09-22 00:00 |
05:53:50.31 |
+02:56:54.5 |
HIP 27799 |
14.35 |
| 2026-09-22 12:00 |
05:53:50.59 |
+02:56:19.0 |
HIP 27799 |
14.66 |
| 2026-09-23 00:00 |
05:53:50.81 |
+02:55:43.5 |
HIP 27799 |
14.99 |
| 2026-09-23 12:00 |
05:53:50.98 |
+02:55:08.0 |
HIP 27799 |
15.32 |
| 2026-09-24 00:00 |
05:53:51.10 |
+02:54:32.4 |
HIP 27799 |
15.65 |
| 2026-09-24 12:00 |
05:53:51.16 |
+02:53:56.9 |
HIP 27799 |
15.99 |
| 2026-09-25 00:00 |
05:53:51.18 |
+02:53:21.3 |
HIP 27799 |
16.33 |
| 2026-09-25 12:00 |
05:53:51.14 |
+02:52:45.7 |
HIP 27799 |
16.68 |
| 2026-09-26 00:00 |
05:53:51.05 |
+02:52:10.2 |
HIP 27799 |
17.03 |
| 2026-09-26 12:00 |
05:53:50.91 |
+02:51:34.6 |
HIP 27799 |
17.38 |
| 2026-09-27 00:00 |
05:53:50.72 |
+02:50:58.9 |
HIP 27799 |
17.74 |
| 2026-09-27 12:00 |
05:53:50.48 |
+02:50:23.3 |
HIP 27799 |
18.09 |
| 2026-09-28 00:00 |
05:53:50.18 |
+02:49:47.7 |
HIP 27799 |
18.46 |
| 2026-09-28 12:00 |
05:53:49.83 |
+02:49:12.1 |
HIP 27799 |
18.82 |
| 2026-09-29 00:00 |
05:53:49.43 |
+02:48:36.5 |
HIP 27799 |
19.19 |
| 2026-09-29 12:00 |
05:53:48.98 |
+02:48:00.9 |
HIP 27799 |
19.57 |
| 2026-09-30 00:00 |
05:53:48.48 |
+02:47:25.3 |
HIP 27799 |
19.94 |
| 2026-09-30 12:00 |
05:53:47.92 |
+02:46:49.7 |
HIP 27799 |
20.32 |
| 2026-10-01 00:00 |
05:53:47.31 |
+02:46:14.1 |
HIP 27799 |
20.70 |
| 2026-10-01 12:00 |
05:53:46.66 |
+02:45:38.6 |
HIP 27799 |
21.09 |
| 2026-10-02 00:00 |
05:53:45.94 |
+02:45:03.0 |
HIP 27799 |
21.47 |
| 2026-10-02 12:00 |
05:53:45.18 |
+02:44:27.5 |
HIP 27799 |
21.87 |
| 2026-10-03 00:00 |
05:53:44.36 |
+02:43:52.0 |
HIP 27799 |
22.26 |
| 2026-10-03 12:00 |
05:53:43.50 |
+02:43:16.5 |
HIP 27799 |
22.66 |
| 2026-10-04 00:00 |
05:53:42.58 |
+02:42:41.0 |
HIP 27781 |
23.02 |
| 2026-10-04 12:00 |
05:53:41.60 |
+02:42:05.6 |
HIP 27781 |
22.42 |
| 2026-10-05 00:00 |
05:53:40.58 |
+02:41:30.2 |
HIP 27781 |
21.80 |
| 2026-10-05 12:00 |
05:53:39.50 |
+02:40:54.8 |
HIP 27781 |
21.18 |
| 2026-10-06 00:00 |
05:53:38.37 |
+02:40:19.5 |
HIP 27781 |
20.55 |
| 2026-10-06 12:00 |
05:53:37.19 |
+02:39:44.2 |
HIP 27781 |
19.92 |
| 2026-10-07 00:00 |
05:53:35.96 |
+02:39:08.9 |
HIP 27781 |
19.28 |
| 2026-10-07 12:00 |
05:53:34.68 |
+02:38:33.7 |
HIP 27781 |
18.63 |
| 2026-10-08 00:00 |
05:53:33.34 |
+02:37:58.6 |
HIP 27781 |
17.98 |
| 2026-10-08 12:00 |
05:53:31.95 |
+02:37:23.4 |
HIP 27781 |
17.32 |
| 2026-10-09 00:00 |
05:53:30.51 |
+02:36:48.4 |
HIP 27781 |
16.65 |
| 2026-10-09 12:00 |
05:53:29.02 |
+02:36:13.4 |
HIP 27781 |
15.97 |
| 2026-10-10 00:00 |
05:53:27.48 |
+02:35:38.4 |
HIP 27781 |
15.29 |
| 2026-10-10 12:00 |
05:53:25.88 |
+02:35:03.5 |
HIP 27781 |
14.60 |
| 2026-10-11 00:00 |
05:53:24.23 |
+02:34:28.7 |
HIP 27781 |
13.91 |